{"id":3945,"date":"2026-09-15T22:20:56","date_gmt":"2026-09-15T19:20:56","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3945"},"modified":"2026-09-17T23:07:17","modified_gmt":"2026-09-17T20:07:17","slug":"300m-aermet-100-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/300m-aermet-100-difference\/","title":{"rendered":"What Is the Difference Between 300M and AerMet 100?"},"content":{"rendered":"<p><strong>300M<\/strong> and <strong>AerMet 100<\/strong> sit at the very top of the ultra-high-strength steels. Their tensile strengths are close to one another \u2014 which is why the two are often weighed up on the same line when a specification is being written. But they get there by completely different metallurgical routes, and the <strong>toughness<\/strong> that results is not the same.<\/p>\n<h3>Two different routes<\/h3>\n<p>300M is a classic quenched and tempered steel: carbon <strong>0.38\u20130.45%<\/strong>, raised silicon, a balanced nickel\u2013chromium\u2013molybdenum composition. It takes its strength from the effect of carbon in the martensitic structure.<\/p>\n<p>AerMet 100 belongs to an entirely different class. Its carbon is low (<strong>0.21\u20130.25%<\/strong>) but its composition contains <strong>11\u201312% nickel<\/strong>, <strong>13\u201314% cobalt<\/strong> and <strong>2.9\u20133.3% chromium<\/strong>. It takes its strength not from carbon but from the finely dispersed precipitates formed during ageing. That difference shows clearly in the elongation and reduction-of-area values on our datasheets.<\/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;\">300M<\/th>\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">AerMet 100<\/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;\">0.38 \u2013 0.45%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.21 \u2013 0.25%<\/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;\">1.65 \u2013 2.00%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">11.0 \u2013 12.0%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Cobalt (Co)<\/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;\">13.0 \u2013 14.0%<\/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;\">0.70 \u2013 0.95%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">2.9 \u2013 3.3%<\/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;\">0.30 \u2013 0.50%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1.1 \u2013 1.3%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Tensile strength Rm<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1861 \u2013 1931 MPa<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1931 \u2013 1965 MPa<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Yield strength Rp0.2<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1517 \u2013 1586 MPa<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1620 \u2013 1724 MPa<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Elongation<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">7 \u2013 8%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">10 \u2013 14% (longitudinal)<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Reduction of area<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">25 \u2013 30%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">55 \u2013 65% (longitudinal)<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Hardness<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 311 HB (normalised + tempered)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">53 HRC<\/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;\">\u2014<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">K92580<\/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;\">6257 \u00b7 6417 \u00b7 6419<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">6478 \u00b7 6532<\/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>The real difference: toughness<\/h3>\n<p>The row to watch in the table is reduction of area. Where 300M gives 25\u201330%, AerMet 100 is at <strong>55\u201365%<\/strong> \u2014 more than twice as much. That determines how much load a part with an initiated crack can continue to carry. The yield strength is higher in AerMet 100 as well (1620\u20131724 MPa against 1517\u20131586 MPa). In other words AerMet 100 is both stronger and tougher.<\/p>\n<h3>Which one, and when?<\/h3>\n<p><strong>300M is sufficient<\/strong> \u2014 landing gear components, forged structural parts, highly stressed shafts. It has been in use for decades, its heat treatment behaviour is well understood, and it is far easier to source than AerMet.<\/p>\n<p><strong>AerMet 100 is required<\/strong> \u2014 parts where damage tolerance is critical and fracture toughness is stated as a number in the specification: main aircraft landing gear members, ballistic applications, critical actuator shafts. If the specification calls out <strong>AMS 6478<\/strong> or <strong>AMS 6532<\/strong>, no other steel is an acceptable substitute.<\/p>\n<h3>Neighbouring alloys<\/h3>\n<p>For the step below, see our <a href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-4340-300m-difference\/\">AISI 4340 \u2013 300M comparison<\/a>. If you are looking for a different metallurgy in a similar strength class, <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/maraging-300\/\">Maraging 300<\/a> and <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/maraging-350\/\">Maraging 350<\/a> are alternatives.<\/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\/300m\/\">300M \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\/aermet-100\/\">AerMet 100 \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>300M and AerMet 100 are in a similar strength class; the difference emerges in toughness and reduction of area.<\/p>\n","protected":false},"author":1,"featured_media":3274,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3945","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 300M and AerMet 100? 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