{"id":3943,"date":"2026-09-15T22:19:30","date_gmt":"2026-09-15T19:19:30","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3943"},"modified":"2026-09-17T23:07:19","modified_gmt":"2026-09-17T20:07:19","slug":"aisi-8620-aisi-9310-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-8620-aisi-9310-difference\/","title":{"rendered":"What Is the Difference Between AISI 8620 and AISI 9310?"},"content":{"rendered":"<p><strong>AISI 8620<\/strong> and <strong>AISI 9310<\/strong> are two case-hardening (carburising) steels that do the same job. Both are produced with a low carbon content, the surface is saturated with carbon in a carburising furnace, and the part is then hardened and tempered. The result is <strong>a hard surface layer with a tough core<\/strong> \u2014 exactly what is wanted for gears, pinions and shafts. The difference between them is how strong that core is.<\/p>\n<h3>The element that makes the difference: nickel<\/h3>\n<p>In AISI 8620 the nickel content is in the <strong>0.40\u20130.70%<\/strong> range. In AISI 9310 it rises to <strong>3.25%<\/strong>, roughly five times as much. The same happens with chromium: 0.40\u20130.60% in 8620 against 1.20% in 9310.<\/p>\n<p>The return on that increase is seen directly in the core. According to the three different carburising + heat treatment programmes on our datasheet, the core of AISI 9310 reaches a tensile strength of <strong>1069\u20131289 MPa<\/strong> and delivers it together with 15\u201316% elongation. In other words the part is strong without being brittle. Since surface hardness is achieved by carburising in both steels, the real distinction is not at the surface but in the load-carrying core.<\/p>\n<h3>Comparison in numbers<\/h3>\n<div style=\"overflow-x:auto;border:1px solid #d7dfe4;background:#fff;margin:10px 0 26px;\">\n<table style=\"border-collapse:collapse;width:100%;font-size:15px;\">\n<thead>\n<tr style=\"background:#DD3333;color:#fff;\">\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">PROPERTY<\/th>\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">AISI 8620<\/th>\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">AISI 9310<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Carbon (C)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.18 \u2013 0.23%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.10%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Nickel (Ni)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.40 \u2013 0.70%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">3.25%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Chromium (Cr)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.40 \u2013 0.60%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1.20%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Molybdenum (Mo)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.15 \u2013 0.25%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.12%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Manganese (Mn)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.70 \u2013 0.90%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.50%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Core after carburising<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2014<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">Rm 1069 \u2013 1289 MPa \u00b7 Elongation 15 \u2013 16% \u00b7 331 \u2013 375 HV<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Carburising temperature<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">900 \u2013 925 \u00b0C<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2014<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">UNS<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">G86200<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">G93106<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">W.Nr (DIN\/EN)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1.6523<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2014<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">AMS<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">6274<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">6260 \u00b7 6265<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"font-size:13px;color:#6b7a84;margin-top:-16px;\">Values are taken from our product datasheets; section thickness and the applied heat treatment regime change the result.<\/p>\n<h3>Which one, and when?<\/h3>\n<p><strong>AISI 8620 is sufficient<\/strong> \u2014 general machine gears, gearbox pinions, sprockets, medium-duty shafts, bushings and pins. It is easy to source, it machines well, and its carburising behaviour is predictable.<\/p>\n<p><strong>AISI 9310 is required<\/strong> \u2014 aerospace and helicopter power transmission gears, high-speed gearboxes, pinions working under impact loading. If the specification calls out <strong>AMS 6260<\/strong> or <strong>AMS 6265<\/strong>, 8620 is not an acceptable substitute; those two AMS numbers describe 9310 directly.<\/p>\n<h3>Beyond case hardening<\/h3>\n<p>If the whole part is to be hardened, quenched and tempered steels are used instead of case-hardening steels: <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-4140\/\">AISI 4140<\/a> and <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-4340\/\">AISI 4340<\/a>. We covered the difference between them <a href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-4140-aisi-4340-difference\/\">in this article<\/a>. Where higher strength is needed, <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/300m\/\">300M<\/a> and <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aermet-100\/\">AerMet 100<\/a> come into play.<\/p>\n<div style=\"border:1px solid #d7dfe4;border-left:4px solid #24BEE5;background:#f7fafb;padding:18px 20px;margin:26px 0;\">\n<p style=\"margin:0 0 10px;font-weight:700;color:#20303c;\">Technical datasheets<\/p>\n<p style=\"margin:0 0 6px;\"><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-8620\/\">AISI 8620 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n<p style=\"margin:0 0 12px;\"><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-9310\/\">AISI 9310 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n<p style=\"margin:0;color:#6b7a84;font-size:14px;\">Both grades are supplied to order in round bar, flat bar, plate, sheet, pipe and forged forms. <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/contact\/\">Contact us<\/a> for a quotation.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The difference between AISI 8620 and AISI 9310 lies in the nickel content and in the core strength after carburising.<\/p>\n","protected":false},"author":1,"featured_media":3272,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3943","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comparisons"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is the Difference Between AISI 8620 and AISI 9310? 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