{"id":15899,"date":"2026-06-04T18:23:31","date_gmt":"2026-06-04T10:23:31","guid":{"rendered":"https:\/\/www.drillpipes.com\/%d1%81%d0%bf%d0%b5%d1%86%d0%b8%d0%b0%d0%bb%d1%8c%d0%bd%d1%8b%d0%b9-%d0%bc%d0%b0%d1%82%d0%b5%d1%80%d0%b8%d0%b0%d0%bb-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1\/"},"modified":"2026-09-18T16:10:54","modified_gmt":"2026-09-18T08:10:54","slug":"%d1%81%d0%bf%d0%b5%d1%86%d0%b8%d0%b0%d0%bb%d1%8c%d0%bd%d1%8b%d0%b9-%d0%bc%d0%b0%d1%82%d0%b5%d1%80%d0%b8%d0%b0%d0%bb-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1","status":"publish","type":"post","link":"https:\/\/www.drillpipes.com\/ru\/%d1%81%d0%bf%d0%b5%d1%86%d0%b8%d0%b0%d0%bb%d1%8c%d0%bd%d1%8b%d0%b9-%d0%bc%d0%b0%d1%82%d0%b5%d1%80%d0%b8%d0%b0%d0%bb-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1\/","title":{"rendered":"\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 vs API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Special Material Drill Pipe vs API 5DP Drill Pipe should be understood from drill-string service conditions, not only from grade names.<\/strong> During drilling, the pipe body and tool joint work under combined tensile load, rotary torque, cyclic bending, internal pressure, impact loading and connection make-up stress. API 5DP Drill Pipe provides the standard grade system for steel drill pipe with upset pipe-body ends and welded-on tool joints, including common grades such as <strong>E75, X95, G105 and S135<\/strong>, with minimum yield strength levels of <strong>75 ksi, 95 ksi, 105 ksi and 135 ksi<\/strong> respectively.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Special Material Drill Pipe is not a universal API grade name.<\/strong> It refers to a controlled material route used when standard API grade selection cannot fully cover the actual service risk, such as high hook load in deep wells, repeated bending in long horizontal sections, sour-service cracking sensitivity, low-temperature impact risk, or high-torque connection demand. The review therefore moves beyond yield strength alone and connects <strong>chemistry control, heat treatment, Charpy impact toughness, hardness, fatigue-sensitive upset transition areas, tool joint matching and inspection records<\/strong> into one performance evaluation. In simple terms, API 5DP Drill Pipe defines the standard baseline; Special Material Drill Pipe is reviewed when the drilling condition requires additional verified performance beyond that baseline.<\/p>\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-id=\"13367\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Special-Material-Drill-Pipe-vs-API-5DP-Drill-Pipe-1024x768.jpg\" alt=\"\" class=\"wp-image-13367\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Special-Material-Drill-Pipe-vs-API-5DP-Drill-Pipe-1024x768.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Special-Material-Drill-Pipe-vs-API-5DP-Drill-Pipe-300x225.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Special-Material-Drill-Pipe-vs-API-5DP-Drill-Pipe.jpg 1448w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/figure>\n\n<h2 class=\"wp-block-heading\">API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430: The Standard Baseline<\/h2>\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.drillpipes.com\/ru\/%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-api-5dp\/\">API 5DP Drill Pipe<\/a> works as the standard baseline before discussing any special material route. It defines drill pipe as a complete assembly, not only a pipe body: the pipe body has upset ends, the tool joints are welded on, and the final product is reviewed by grade, dimension, connection, PSL level, marking and inspection records.<\/p>\n\n<p class=\"wp-block-paragraph\">The common <strong>API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441s<\/strong> iNClude <strong>E75, X95, G105 and S135<\/strong>. The \u043a\u043b\u0430\u0441\u0441 number corresponds to the minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438 in ksi, so E75 starts at <strong>75 ksi<\/strong>, X95 at <strong>95 ksi<\/strong>, G105 at <strong>105 ksi<\/strong>, and S135 at <strong>135 ksi<\/strong>. This \u043a\u043b\u0430\u0441\u0441 ladder gives engineers a standard way to match \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 strength with \u0431\u0443\u0440\u0435\u043d\u0438\u0435 load, \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 depth, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 requirement and inspection level.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">API 5DP Control Item<\/th><th>What It Means in \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 Review<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">\u043a\u043b\u0430\u0441\u0441<\/td><td>Defines the basic strength level, such as E75, X95, G105 or S135<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0442\u0440\u0443\u0431\u0430 body<\/td><td>Controls OD, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438, upset type and mechanical properties<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/td><td>Controls \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 type, shoulder area, \u0440\u0435\u0437\u044c\u0431\u0430 condition and \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 transfer<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">PSL level<\/td><td>Adds dIFferent levels of technical and inspection requirements<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Mechanical testing<\/td><td>VerIFies \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438, \u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u044c \u043d\u0430 \u0440\u0430\u0437\u0440\u044b\u0432 and elongation<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Marking and traceability<\/td><td>Links \u0442\u0440\u0443\u0431\u0430 identity with heat number, MTC and inspection records<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 starts from this same baseline but adds another layer of \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b and \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c review. When \u0431\u0443\u0440\u0435\u043d\u0438\u0435 conditions involve higher tensile load, repeated bending, severe dogleg, low-temperature exposure, sour-service risk or high-\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 operation, the review moves beyond \u043a\u043b\u0430\u0441\u0441 name and basic dimensions. Chemistry control, heat treatment, hardness, Charpy i\u041c\u041f\u0430ct toughness, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c-sensitive transition areas and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 matching become part of the technical evaluation.<\/p>\n\n<h2 class=\"wp-block-heading\">API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441s and Mechanical Strength<\/h2>\n\n<p class=\"wp-block-paragraph\">API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441s are mainly separated by yield-strength level. This strength ladder gives a clear baseline before co\u041c\u041f\u0430ring standard API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 with any \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b route. E75, X95, G105 and S135 do not only represent dIFferent \u043a\u043b\u0430\u0441\u0441 names; they define dIFferent yield-strength windows that affect tensile capacity, \u0431\u0443\u0440\u0435\u043d\u0438\u0435 load margin and the first level of \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u044b\u0431\u043e\u0440.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">API 5DP \u043a\u043b\u0430\u0441\u0441<\/th><th class=\"has-text-align-center\" data-align=\"center\">Minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438<\/th><th class=\"has-text-align-center\" data-align=\"center\">Maximum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438<\/th><th class=\"has-text-align-center\" data-align=\"center\">Minimum \u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u044c \u043d\u0430 \u0440\u0430\u0437\u0440\u044b\u0432<\/th><th>\u043a\u043b\u0430\u0441\u0441 Meaning<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><a href=\"https:\/\/www.drillpipes.com\/ru\/%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-e75\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-secondary-color\">E75<\/mark><\/a><\/td><td class=\"has-text-align-center\" data-align=\"center\">75 ksi \/ 517 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">105 ksi \/ 724 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">100 ksi \/ 689 \u041c\u041f\u0430<\/td><td>Lower-strength API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441 for moderate \u0431\u0443\u0440\u0435\u043d\u0438\u0435 loads<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">X95<\/td><td class=\"has-text-align-center\" data-align=\"center\">95 ksi \/ 655 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">125 ksi \/ 862 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">105 ksi \/ 724 \u041c\u041f\u0430<\/td><td>Intermediate strength \u043a\u043b\u0430\u0441\u0441 for deeper or higher-load sections<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><a href=\"https:\/\/www.drillpipes.com\/ru\/%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-g105\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-secondary-color\">G105<\/mark><\/a><\/td><td class=\"has-text-align-center\" data-align=\"center\">105 ksi \/ 724 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">135 ksi \/ 931 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">115 ksi \/ 793 \u041c\u041f\u0430<\/td><td>Higher-strength \u043a\u043b\u0430\u0441\u0441 with iNCreased tensile load capacity<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">S135<\/td><td class=\"has-text-align-center\" data-align=\"center\">135 ksi \/ 931 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">165 ksi \/ 1138 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">145 ksi \/ 1000 \u041c\u041f\u0430<\/td><td>Common high-strength API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441 for demanding \u0431\u0443\u0440\u0435\u043d\u0438\u0435 loads<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/API-5DP-Drill-Pipe-Grades-Mechanical-Strength-Reference-Detailed.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"\u0412\u0441\u0442\u0430\u0432\u043a\u0430 API 5DP Drill Pipe Grades Mechanical Strength Reference Detailed\"><\/object><a id=\"wp-block-file--media-81ee784c-7b15-4d53-bdbc-255f4276abe6\" href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/API-5DP-Drill-Pipe-Grades-Mechanical-Strength-Reference-Detailed.pdf\">API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441s Mechanical Strength RefereNCe Detailed<\/a><a href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/API-5DP-Drill-Pipe-Grades-Mechanical-Strength-Reference-Detailed.pdf\" class=\"wp-block-file__button wp-element-button\" download=\"\" aria-describedby=\"wp-block-file--media-81ee784c-7b15-4d53-bdbc-255f4276abe6\">Download<\/a><\/div>\n\n<p class=\"wp-block-paragraph\">From E75 to S135, the main iNCrease is the yield-strength window, which helps the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 carry higher tensile load under deeper or more demanding \u0431\u0443\u0440\u0435\u043d\u0438\u0435 conditions. However, \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 works under combined tension, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, bending and internal pressure, so higher \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438 does not automatically solve \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c cracking, brittle fracture, sour-service cracking or \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435-side stress.<\/p>\n\n<h2 class=\"wp-block-heading\">What \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 Means<\/h2>\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/www.drillpipes.com\/ru\/%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-%d0%b8%d0%b7-%d1%81%d0%bf%d0%b5%d1%86%d0%b8%d0%b0%d0%bb%d1%8c%d0%bd%d1%8b%d1%85-%d0%bc%d0%b0%d1%82%d0%b5%d1%80\/\">Special Material Drill Pipe<\/a> is not a single universal API grade name. It is a performance-based drill pipe category used when standard API grade selection cannot fully cover the required strength, toughness, fatigue resistance, sour-service control or low-temperature impact performance.<\/strong> The review is not limited to the pipe body grade; it also includes the upset transition, tool joint, heat-treatment condition, hardness control and traceability records as one complete drill pipe performance system.<\/p>\n\n<p class=\"wp-block-paragraph\">A standard API \u043a\u043b\u0430\u0441\u0441 is mainly identIFied by its strength level, such as <strong>E75, X95, G105 and S135<\/strong>, with minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438 from <strong>75 ksi to 135 ksi<\/strong>. \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 starts from the same \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 structure, but the technical review moves further into <strong>Charpy i\u041c\u041f\u0430ct toughness, hardness limits, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c-sensitive transition areas, sour-service suitability, low-temperature \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 matching<\/strong>.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Technical Review Item<\/th><th>What It Means for \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/th><th>Why It Matters<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Strength and toughness<\/td><td>\u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438, \u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u044c \u043d\u0430 \u0440\u0430\u0437\u0440\u044b\u0432, elongation and Charpy i\u041c\u041f\u0430ct energy are reviewed together, not as separate numbers.<\/td><td>Higher strength only has value when the \u0442\u0440\u0443\u0431\u0430 still keeps enough toughness for bending, i\u041c\u041f\u0430ct and low-temperature service.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b and heat treatment<\/td><td>Chemistry control, queNChing, tempering, hardness and microstructure are checked against the required \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c route.<\/td><td>Poor heat-treatment control can create unstable strength, excessive hardness or reduced crack resistaNCe.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 areas<\/td><td>Upset transition, \u0442\u0440\u0443\u0431\u0430 body-to-\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 area, \u0440\u0435\u0437\u044c\u0431\u0430 condition and shoulder contact are reviewed as \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c-sensitive zones.<\/td><td>Repeated rotation, dogleg bending and high \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 often coNCentrate stress near transitions and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><a href=\"https:\/\/www.drillpipes.com\/ru\/%d0%ba%d0%b0%d0%ba-%d0%b8%d0%bd%d1%81%d0%bf%d0%b5%d0%ba%d1%82%d0%b8%d1%80%d1%83%d0%b5%d1%82%d1%81%d1%8f-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-api-5dp\/\">Test records and traceability<\/a><\/td><td>MTC, heat number, tensile test, i\u041c\u041f\u0430ct test, hardness record, NDT and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 inspection are linked to \u0442\u0440\u0443\u0431\u0430 marking.<\/td><td>\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c must be proven by records, not only by a \u043a\u043b\u0430\u0441\u0441 name or product description.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 should be verIFied by test data that matches the intended service condition. \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438, \u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u044c \u043d\u0430 \u0440\u0430\u0437\u0440\u044b\u0432, Charpy i\u041c\u041f\u0430ct values, hardness records, heat number traceability and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \/ \u0440\u0435\u0437\u044c\u0431\u0430 inspection should be reviewed together. This evideNCe chain confirms whether the \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b route supports real \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c under the required \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c, temperature or sour-service condition.<\/p>\n\n<h2 class=\"wp-block-heading\">Chemical Composition and \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b-Control \u0440\u0430\u0437\u043d\u0438\u0446\u0430<\/h2>\n\n<p class=\"wp-block-paragraph\">The chemical-composition \u0440\u0430\u0437\u043d\u0438\u0446\u0430 \u043c\u0435\u0436\u0434\u0443 <strong>API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong> and <strong>\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong> is mainly the depth of \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b control. API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 chemistry is reviewed to support standard \u043a\u043b\u0430\u0441\u0441 compliaNCe, mechanical properties and heat-treatment response. The focus is whether the \u0442\u0440\u0443\u0431\u0430 meets the specIFied API \u043a\u043b\u0430\u0441\u0441, such as E75, X95, G105 or S135.<\/p>\n\n<p class=\"wp-block-paragraph\">For <strong>\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong>, chemistry is reviewed as part of a stricter \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c route. Alloy design, hardenability, heat treatment, hardness, Charpy i\u041c\u041f\u0430ct toughness and cracking sensitivity are checked together because the \u0442\u0440\u0443\u0431\u0430 may work under higher strength, sour service, low temperature or \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c-sensitive \u0431\u0443\u0440\u0435\u043d\u0438\u0435 conditions. The key \u0440\u0430\u0437\u043d\u0438\u0446\u0430 is not the preseNCe of alloy elements alone, but how those elements support strength, toughness and service \u043d\u0430\u0434\u0451\u0436\u043d\u043e\u0441\u0442\u044c after heat treatment.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">\u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b-Control Item<\/th><th>API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/th><th>\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">\u043a\u043b\u0430\u0441\u0441 basis<\/td><td>Standard API \u043a\u043b\u0430\u0441\u0441 system such as E75, X95, G105, S135<\/td><td>\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b route based on strength, toughness, sour-service or \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c requirement<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Chemistry review<\/td><td>Heat analysis and product analysis support API \u043a\u043b\u0430\u0441\u0441 compliaNCe<\/td><td>Chemistry is reviewed together with alloy design, hardenability, toughness and cracking sensitivity<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Carbon control<\/td><td>Supports strength and heat-treatment response<\/td><td>More sensitive where high strength and i\u041c\u041f\u0430ct toughness must be balaNCed<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Mn, Cr, Mo, Ni, V, Nb, Ti<\/td><td>Used according to \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b design and manufacturing route<\/td><td>May be adjusted to improve strength, hardenability, grain refinement or toughness<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">P and S control<\/td><td>Restricted because high residual elements can reduce toughness<\/td><td>More critical for low-temperature toughness, sour-service or \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c-sensitive use<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Heat treatment<\/td><td>Applied to meet \u043a\u043b\u0430\u0441\u0441 mechanical requirements<\/td><td>Usually a core part of the \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c route<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">VerIFication<\/td><td>MTC, heat number, tensile test, i\u041c\u041f\u0430ct test where required<\/td><td>MTC plus \u043a\u043b\u0430\u0441\u0441 datasheet, heat-treatment record, Charpy test, hardness and traceability review<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">This \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b-control \u0440\u0430\u0437\u043d\u0438\u0446\u0430 is important because \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c is not determined by chemistry alone. A standard API \u043a\u043b\u0430\u0441\u0441 can be accepted when its chemical analysis, mechanical properties and inspection records meet the specIFied API 5DP requirement. A \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b route needs stronger evideNCe: the chemistry, heat treatment, hardness, i\u041c\u041f\u0430ct toughness and traceability records must support the same \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c target.<\/p>\n\n<h2 class=\"wp-block-heading\">Mechanical Strength Is Not the Only \u0440\u0430\u0437\u043d\u0438\u0446\u0430<\/h2>\n\n<p class=\"wp-block-paragraph\">Mechanical strength is only the first layer of \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0435. For <strong>\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 vs API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong>, the more important \u0440\u0430\u0437\u043d\u0438\u0446\u0430 is how strength, toughness, hardness, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c resistaNCe and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c are controlled together under severe \u0431\u0443\u0440\u0435\u043d\u0438\u0435 conditions.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Review Area<\/th><th>Standard API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/th><th>\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Strength level<\/td><td>Defined by API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441s<\/td><td>May exceed common standard \u043a\u043b\u0430\u0441\u0441 use or tighten the strength window<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Toughness<\/td><td>Controlled by \u043a\u043b\u0430\u0441\u0441, PSL and project requirement<\/td><td>Often reviewed more strictly, especially at low temperature or high strength<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Hardness<\/td><td>Controlled according to \u043a\u043b\u0430\u0441\u0441 and service requirement<\/td><td>More sensitive in sour service, high-strength and cracking-risk conditions<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c behavior<\/td><td>Reviewed through standard design and inspection<\/td><td>More focus on upset transition, cyclic bending and stress coNCentration<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 matching<\/td><td>Standard \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 inspection and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 review<\/td><td>\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 strength, hardness and shoulder\/\u0440\u0435\u0437\u044c\u0431\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c must match \u0442\u0440\u0443\u0431\u0430 body demand<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Documentation<\/td><td>Standard MTC and inspection records<\/td><td>Additional datasheet, i\u041c\u041f\u0430ct test, hardness and traceability review may be needed<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">Standard API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 is mainly reviewed through API 5DP \u043a\u043b\u0430\u0441\u0441 strength, PSL level, dimensions, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 condition and traceability records. <strong>\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong> adds stricter review of toughness, hardness, heat-treatment consisteNCy, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c-sensitive transition areas and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 matching, especially in long horizontal \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s, severe dogleg sections, sour-service environments, low-temperature \u0431\u0443\u0440\u0435\u043d\u0438\u0435 and high-\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 operations.<\/p>\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Standard-API-Drill-Pipe-vs-Special-Material-Drill-Pipe-Performance-Review.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"\u0412\u0441\u0442\u0430\u0432\u043a\u0430 Standard API Drill Pipe vs Special Material Drill Pipe Performance Review\"><\/object><a id=\"wp-block-file--media-2d77831a-15ab-465a-abfc-453c6d45f793\" href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Standard-API-Drill-Pipe-vs-Special-Material-Drill-Pipe-Performance-Review.pdf\">Standard API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 vs \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c Review<\/a><a href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Standard-API-Drill-Pipe-vs-Special-Material-Drill-Pipe-Performance-Review.pdf\" class=\"wp-block-file__button wp-element-button\" download=\"\" aria-describedby=\"wp-block-file--media-2d77831a-15ab-465a-abfc-453c6d45f793\">Download<\/a><\/div>\n\n<h2 class=\"wp-block-heading\">I\u041c\u041f\u0430ct Toughness and Low-Temperature \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c<\/h2>\n\n<p class=\"wp-block-paragraph\">I\u041c\u041f\u0430ct toughness shows how \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 steel resists brittle fracture under sudden i\u041c\u041f\u0430ct, crack initiation or low-temperature service. As strength iNCreases, this review becomes more important because high \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438 alone does not prove safe field \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c.<\/p>\n\n<p class=\"wp-block-paragraph\">For <strong>API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong>, toughness is reviewed by \u043a\u043b\u0430\u0441\u0441, PSL level and project requirement. For <strong>\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong>, toughness, hardness and heat-treatment stability need closer control, especially in low-temperature \u0431\u0443\u0440\u0435\u043d\u0438\u0435, sour-service conditions and \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c-sensitive \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s.<\/p>\n\n<p class=\"wp-block-paragraph\">A professional toughness review should iNClude:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Charpy i\u041c\u041f\u0430ct test temperature<\/li>\n\n\n\n<li>Average i\u041c\u041f\u0430ct energy<\/li>\n\n\n\n<li>\u043e\u0434\u0438\u043d\u043e\u0447\u043d\u044b\u0439 specimen minimum value<\/li>\n\n\n\n<li>\u0442\u0440\u0443\u0431\u0430 body test location<\/li>\n\n\n\n<li>Weld zone or upset area when applicable<\/li>\n\n\n\n<li>\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 i\u041c\u041f\u0430ct or hardness requirement where specIFied<\/li>\n\n\n\n<li>Relationship \u043c\u0435\u0436\u0434\u0443 strength level and toughness result<\/li>\n<\/ul>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Condition<\/th><th>Why Toughness Matters<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Low-temperature \u0431\u0443\u0440\u0435\u043d\u0438\u0435 area<\/td><td>Steel toughness can decrease as temperature drops; Charpy test temperature becomes important<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">High-strength \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/td><td>Higher strength can reduce toughness margin IF heat treatment is not controlled<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Long horizontal \u0431\u0443\u0440\u0435\u043d\u0438\u0435<\/td><td>Repeated bending and rotation can accelerate \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c crack growth<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Severe dogleg section<\/td><td>Local bending stress iNCreases \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c risk near transition areas<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Sour-service environment<\/td><td>Hardness and microstructure must be controlled to reduce sulfide stress cracking risk<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Ultra-deep \u0431\u0443\u0440\u0435\u043d\u0438\u0435<\/td><td>High tension, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and cyclic load require strength and toughness to be reviewed together<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h2 class=\"wp-block-heading\">Hardness, Sour Service and Cracking Sensitivity<\/h2>\n\n<p class=\"wp-block-paragraph\">Hardness control is another important \u0440\u0430\u0437\u043d\u0438\u0446\u0430 \u043c\u0435\u0436\u0434\u0443 ordinary \u043a\u043b\u0430\u0441\u0441 \u0432\u044b\u0431\u043e\u0440 and \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b review. For standard API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430, hardness is checked according to \u043a\u043b\u0430\u0441\u0441, service condition and applicable specIFication. For sour service or high-strength \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b use, hardness becomes a more sensitive item because high hardness can iNCrease cracking susceptibility.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Review Item<\/th><th>Technical Meaning<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Surface hardness<\/td><td>Helps identIFy excessive hardening risk<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Through-wall hardness<\/td><td>Useful where heat-treatment unIFormity matters<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 hardness<\/td><td>Important for \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c and service condition<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Sour-service hardness control<\/td><td>Helps reduce sulfide stress cracking risk<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Heat-treatment consisteNCy<\/td><td>Supports stable strength and toughness along the \u0442\u0440\u0443\u0431\u0430 body<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">MTC + hardness record<\/td><td>Connects measured result to heat number and product identity<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">For sour \u0433\u0430\u0437 \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s or H\u2082S exposure, \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 should be evaluated through sour-service rules, hardness control and cracking-resistaNCe logic. A high-strength \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 without sour-service qualIFication should not be used in sour service simply because its \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438 is high.<\/p>\n\n<h2 class=\"wp-block-heading\">\u0442\u0440\u0443\u0431\u0430 Body, Upset End and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0440\u0430\u0437\u043d\u0438\u0446\u0430<\/h2>\n\n<p class=\"wp-block-paragraph\">API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 and \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 should both be reviewed as complete \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 assemblies. The \u0442\u0440\u0443\u0431\u0430 body carries tensile and bending load. The upset end and weld zone transfer stress. The \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 handles \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 strength, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 transmission, shoulder contact and \u0440\u0435\u0437\u044c\u0431\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c.<\/p>\n\n<p class=\"wp-block-paragraph\">The higher the \u0442\u0440\u0443\u0431\u0430 body strength, the more important the matching \u043c\u0435\u0436\u0434\u0443 \u0442\u0440\u0443\u0431\u0430 body and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 becomes.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 Area<\/th><th>Main FuNCtion<\/th><th>Standard API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 Review<\/th><th>\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 Review<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0442\u0440\u0443\u0431\u0430 body<\/td><td>Carries tension, bending and internal pressure<\/td><td>\u043a\u043b\u0430\u0441\u0441, OD, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438, tensile test, dimensional check<\/td><td>Strength window, toughness, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c behavior and heat-treatment consisteNCy<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Upset end<\/td><td>Transfers section change from \u0442\u0440\u0443\u0431\u0430 body to \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/td><td>Upset type, dimensional control and visual inspection<\/td><td>Transition geometry, local stress coNCentration and \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c risk<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Weld zone<\/td><td>Joins \u0442\u0440\u0443\u0431\u0430 body and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/td><td>Weld-zone inspection and acceptaNCe<\/td><td>Higher attention when strength level or service severity iNCreases<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/td><td>Carries \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 load and \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442<\/td><td>\u0440\u0435\u0437\u044c\u0431\u0430, shoulder, OD \/ ID, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 type<\/td><td>Strength, hardness, i\u041c\u041f\u0430ct behavior and matching with \u0442\u0440\u0443\u0431\u0430 body<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0440\u0435\u0437\u044c\u0431\u0430 \/ shoulder<\/td><td>Provides make-up and \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 transfer<\/td><td>Gauging and surface condition<\/td><td>More critical in high-\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 or long lateral \u0431\u0443\u0440\u0435\u043d\u0438\u0435<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" data-id=\"13368\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/API-5DP-Drill-Pipe-4-1024x683.jpg\" alt=\"\" class=\"wp-image-13368\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/API-5DP-Drill-Pipe-4-1024x683.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/API-5DP-Drill-Pipe-4-300x200.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/API-5DP-Drill-Pipe-4.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/figure>\n\n<p class=\"wp-block-paragraph\">\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 is often selected because the failure risk is not limited to the \u0442\u0440\u0443\u0431\u0430 body. In high-\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 or high-\u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c \u0431\u0443\u0440\u0435\u043d\u0438\u0435, the \u0440\u0435\u0437\u044c\u0431\u0430, shoulder, upset transition and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 may become the controlling points.<\/p>\n\n<h2 class=\"wp-block-heading\">\u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435 \u0440\u0430\u0437\u043d\u0438\u0446\u0430: When API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 Is Suitable<\/h2>\n\n<p class=\"wp-block-paragraph\">API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 is suitable when the \u0431\u0443\u0440\u0435\u043d\u0438\u0435 program can be controlled within a standard \u043a\u043b\u0430\u0441\u0441, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 and inspection framework. The main review is whether the selected API 5DP \u043a\u043b\u0430\u0441\u0441, such as <strong>E75, X95, G105 or S135<\/strong>, provides enough tensile margin, torsional capacity, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 co\u041c\u041f\u0430tibility and inspection acceptaNCe for the planned \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 profile.<\/p>\n\n<p class=\"wp-block-paragraph\">Standard API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 is generally suitable for:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Conventional vertical wells with moderate tensile load<\/strong><br\/>The drill string mainly works under axial tension, rotary torque and normal tripping load. Dogleg severity and cyclic bending are limited, so standard API 5DP drill pipe grades can usually provide a clear strength range and inspection basis.<\/li>\n\n\n\n<li><strong>Medium-depth directional wells with controlled deviation<\/strong><br\/>The well has directional sections, but the drilling interval does not create severe repeated bending or long-distance torque-and-drag accumulation. X95, G105 or S135 can be reviewed by tensile load, OD \/ wall thickness, connection type and normal fatigue margin.<\/li>\n\n\n\n<li><strong>Deep wells where S135 still has enough design margin<\/strong><br\/>S135 provides a <strong>135 ksi minimum yield-strength level<\/strong> and is commonly used as the high-strength API-grade baseline. It is suitable when calculated hook load, torque, connection demand and fatigue risk remain within verified limits.<\/li>\n\n\n\n<li><strong>Drilling programs using common API connections<\/strong><br\/>When NC, FH, IF or other specified rotary shouldered connections are used within normal make-up, shoulder and thread inspection requirements, API 5DP review can cover pipe body grade, tool joint condition and traceability records.<\/li>\n\n\n\n<li><strong>Wells without severe sour, low-temperature or fatigue demand<\/strong><br\/>If H\u2082S exposure, low-temperature impact requirement, severe dogleg, long horizontal rotation and ultra-high tensile load are not controlling factors, standard API drill pipe is usually the cleaner technical choice.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 becomes less suitable when the \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 profile moves beyond normal \u043a\u043b\u0430\u0441\u0441 review. Severe cyclic bending, long horizontal rotation, insufficient S135 design margin, high \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, sour-service exposure or low-temperature i\u041c\u041f\u0430ct requirements can shIFt the limiting factor from basic \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438 to toughness, hardness, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c resistaNCe or \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c.<\/p>\n\n<h2 class=\"wp-block-heading\">\u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435 \u0440\u0430\u0437\u043d\u0438\u0446\u0430: When \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 Is Needed<\/h2>\n\n<p class=\"wp-block-paragraph\">\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 is used when the \u0431\u0443\u0440\u0435\u043d\u0438\u0435 condition requires a controlled \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b route beyond standard API \u043a\u043b\u0430\u0441\u0441 \u0432\u044b\u0431\u043e\u0440. The decision should be based on the actual load path of the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430, not on the product name. In severe \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s, the critical issue is often not only \u0442\u0440\u0443\u0431\u0430 body \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438, but also bending \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c, i\u041c\u041f\u0430ct toughness, hardness control, upset-transition stress and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 matching.<\/p>\n\n<p class=\"wp-block-paragraph\">\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441s are more appropriate for:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Ultra-deep wells with high hook load and tensile demand<\/strong><br\/>When the drill string load approaches the upper range of standard API-grade drill pipe, a higher-strength or tighter strength-window material route may be required. In this case, strength, toughness and tool joint matching should be reviewed together.<\/li>\n\n\n\n<li><strong>Long horizontal wells with extended rotating intervals<\/strong><br\/>Long lateral sections increase torque, drag and cyclic bending. Fatigue damage can accumulate around upset transitions, tool joints and connection areas, so fatigue resistance and connection-side performance become more important.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/www.drillpipes.com\/ru\/how-to-choose-api-5dp-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-%d0%ba%d0%bb%d0%b0%d1%81%d1%81s-for-deep-and-directional-%d1%81%d0%ba%d0%b2%d0%b0%d0%b6\/\">Extended-reach drilling with combined tension, torque and drag<\/a><\/strong><br\/>ERD wells place the drill string under combined axial load, torque, drag and bending over a long measured depth. Material strength alone is not enough; toughness, fatigue behavior and tool joint performance need to work as one system.<\/li>\n\n\n\n<li><strong>Severe dogleg or high build-rate sections<\/strong><br\/>Local bending stress can concentrate near the pipe body-to-upset transition and tool joint area. Special Material Drill Pipe is reviewed where fatigue-sensitive geometry, heat-treatment consistency and impact toughness become key control points.<\/li>\n\n\n\n<li><strong>Low-temperature drilling conditions<\/strong><br\/>Steel toughness can decrease at lower temperatures, increasing brittle fracture risk under impact or crack initiation. Charpy impact toughness at the required test temperature should be checked together with strength and heat-treatment results.<\/li>\n\n\n\n<li><strong>Sour-service or H\u2082S exposure<\/strong><br\/>High hardness and unsuitable microstructure can increase sulfide stress cracking risk. Special material review should include hardness control, sour-service suitability and cracking-resistance logic, not only yield strength.<\/li>\n\n\n\n<li><strong>High-torque drilling sections<\/strong><br\/>In high-torque operation, the <a href=\"https:\/\/www.drillpipes.com\/special-threaded-drill-pipe-advantages\/\">connection shoulder, thread condition and tool joint strength<\/a> may become limiting factors. Pipe body strength, tool joint matching, thread inspection and shoulder performance should be reviewed together.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 is not a universal up\u043a\u043b\u0430\u0441\u0441 for every \u0431\u0443\u0440\u0435\u043d\u0438\u0435 program. It is technically justIFied when the \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 condition creates a clear requirement for higher strength, better toughness, stricter hardness control, improved \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c resistaNCe or more controlled \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c. Where a standard API 5DP \u043a\u043b\u0430\u0441\u0441 already provides enough margin, standard API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 remains the more direct technical route.<\/p>\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Drill-Pipe-Selection-Guide-API-5DP-or-Special-Material-Route.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"\u0412\u0441\u0442\u0430\u0432\u043a\u0430 Drill Pipe Selection Guide API 5DP or Special Material Route\"><\/object><a id=\"wp-block-file--media-4aa89261-c4c8-45c5-a5f6-40278fe8f0b6\" href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Drill-Pipe-Selection-Guide-API-5DP-or-Special-Material-Route.pdf\">\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0432\u044b\u0431\u043e\u0440 Guide API 5DP or \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b Route<\/a><a href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Drill-Pipe-Selection-Guide-API-5DP-or-Special-Material-Route.pdf\" class=\"wp-block-file__button wp-element-button\" download=\"\" aria-describedby=\"wp-block-file--media-4aa89261-c4c8-45c5-a5f6-40278fe8f0b6\">Download<\/a><\/div>\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-d61d70aa wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-primary-color has-secondary-background-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/www.drillpipes.com\/ru\/%d0%ba%d0%be%d0%bd%d1%82%d0%b0%d0%ba%d1%82%d1%8b\/\">Free quotation<\/a><\/div>\n<\/div>\n\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>F1:Is \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 a standard API 5DP \u043a\u043b\u0430\u0441\u0441?<\/summary>\n<p class=\"wp-block-paragraph\">Q1:No. <strong>\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong> is not a universal API 5DP \u043a\u043b\u0430\u0441\u0441 name. API 5DP \u043a\u043b\u0430\u0441\u0441s are normally identIFied by standard strength levels such as <strong>E75, X95, G105 and S135<\/strong>. \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 refers to a controlled \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b route where strength, toughness, hardness, heat treatment, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c behavior and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 matching are reviewed beyond normal standard API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0432\u044b\u0431\u043e\u0440.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>F2:When is API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 enough for a \u0431\u0443\u0440\u0435\u043d\u0438\u0435 program?<\/summary>\n<p class=\"wp-block-paragraph\">Q2:<strong>API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong> is usually enough when the selected \u043a\u043b\u0430\u0441\u0441 provides sufficient tensile margin, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 capacity, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 co\u041c\u041f\u0430tibility and inspection evideNCe for the \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 profile. For example, S135 may be suitable where the calculated hook load, dogleg severity, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c risk, temperature and service environment remain within verIFied API-\u043a\u043b\u0430\u0441\u0441 limits.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>F3:When should \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 be reviewed instead of standard API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430?<\/summary>\n<p class=\"wp-block-paragraph\">Q3:<strong>\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong> should be reviewed when the limiting factor is no longer only API \u043a\u043b\u0430\u0441\u0441 strength. Long horizontal \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s, ERD sections, severe dogleg intervals, low-temperature \u0431\u0443\u0440\u0435\u043d\u0438\u0435, sour-service exposure and high-\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 operation may require closer control of Charpy i\u041c\u041f\u0430ct toughness, hardness, heat-treatment stability, upset-transition \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>F4:What records prove that \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 is dIFferent from standard API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430?<\/summary>\n<p class=\"wp-block-paragraph\">Q4:The \u0440\u0430\u0437\u043d\u0438\u0446\u0430 must be proven by records, not only by a product name. A complete technical file should connect <strong>\u0442\u0440\u0443\u0431\u0430 marking \u2192 heat number \u2192 MTC \u2192 mechanical test report \u2192 Charpy i\u041c\u041f\u0430ct test \u2192 hardness record \u2192 NDT report \u2192 dimensional inspection \u2192 \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 and \u0440\u0435\u0437\u044c\u0431\u0430 inspection \u2192 final release record<\/strong>. Without this chain, the \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b route has limited value for \u043a\u043b\u0430\u0441\u0441 \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0435 or field-use evaluation.<\/p>\n<\/details>\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-3 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"410\" data-id=\"12635\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-1024x410.png\" alt=\"\" class=\"wp-image-12635\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-1024x410.png 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-300x120.png 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-2000x800.png 2000w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Special Material Drill Pipe vs API 5DP Drill Pipe should be understood from drill-string service conditions, not only from grade names. During drilling, the pipe body and tool joint work under combined tensile load, rotary torque, cyclic bending, internal pressure, impact loading and connection make-up stress. API 5DP Drill Pipe provides the standard grade system &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.drillpipes.com\/ru\/%d1%81%d0%bf%d0%b5%d1%86%d0%b8%d0%b0%d0%bb%d1%8c%d0%bd%d1%8b%d0%b9-%d0%bc%d0%b0%d1%82%d0%b5%d1%80%d0%b8%d0%b0%d0%bb-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1\/\" class=\"more-link\">\u0427\u0438\u0442\u0430\u0442\u044c \u0434\u0430\u043b\u0435\u0435<span class=\"screen-reader-text\"> &#171;\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 vs API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430&#187;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":15903,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[106],"tags":[],"class_list":["post-15899","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-106"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 vs API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 - Octal<\/title>\n<meta name=\"description\" content=\"Co\u041c\u041f\u0430re \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 and API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 by \u043a\u043b\u0430\u0441\u0441s, strength, toughness, hardness, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c control and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 review.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.drillpipes.com\/ru\/%d1%81%d0%bf%d0%b5%d1%86%d0%b8%d0%b0%d0%bb%d1%8c%d0%bd%d1%8b%d0%b9-%d0%bc%d0%b0%d1%82%d0%b5%d1%80%d0%b8%d0%b0%d0%bb-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1\/\" \/>\n<meta property=\"og:locale\" content=\"ru_RU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u041d\u0430\u043f\u0438\u0441\u0430\u043d\u043e \u0430\u0432\u0442\u043e\u0440\u043e\u043c\" \/>\n\t<meta name=\"twitter:data1\" content=\"Lynx Bai\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u041f\u0440\u0438\u043c\u0435\u0440\u043d\u043e\u0435 \u0432\u0440\u0435\u043c\u044f \u0434\u043b\u044f \u0447\u0442\u0435\u043d\u0438\u044f\" \/>\n\t<meta name=\"twitter:data2\" content=\"13 \u043c\u0438\u043d\u0443\u0442\" \/>\n<script type=\"application\/ld+json\" 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