{"id":3946,"date":"2026-09-15T22:28:47","date_gmt":"2026-09-15T19:28:47","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3946"},"modified":"2026-09-17T23:07:16","modified_gmt":"2026-09-17T20:07:16","slug":"maraging-250-maraging-300-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/maraging-250-maraging-300-difference\/","title":{"rendered":"What Is the Difference Between Maraging 250 and Maraging 300?"},"content":{"rendered":"<p><strong>Maraging 250<\/strong> and <strong>Maraging 300<\/strong> belong to a family that is completely different from conventional steels. In both, carbon is at <strong>max 0.03%<\/strong> \u2014 that is, they do not take their strength from carbon. The structure forms as a soft martensite containing <strong>17\u201319% nickel<\/strong>; hardness is gained later, during the <strong>ageing<\/strong> treatment carried out at around 480 \u00b0C, through the fine precipitates formed by molybdenum and titanium.<\/p>\n<p>The practical consequence is this: the material machines easily in the annealed condition, the part is aged after it has been finished, and dimensional change during that stage stays very low. There is no quench cracking risk. That is why these grades are preferred for tooling, shafts, aircraft fasteners and rocket casings.<\/p>\n<h3>What makes the difference: cobalt and titanium<\/h3>\n<p>The nickel and molybdenum contents of the two grades are almost identical. The difference comes down to two elements: <strong>cobalt<\/strong> rises from 7.0\u20138.5% to 8.0\u20139.5%, and <strong>titanium<\/strong> from 0.3\u20130.5% to 0.55\u20130.80%. Titanium is the main source of the precipitates formed during ageing; the higher its content, the higher the strength obtained. Cobalt supports the precipitation behaviour of molybdenum.<\/p>\n<p>The number in the grade name states the nominal yield strength in ksi. Accordingly, our datasheet gives the yield strength of Maraging 250 after ageing as <strong>min 1724 MPa (250 ksi)<\/strong>.<\/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;\">Maraging 250<\/th>\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">Maraging 300<\/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;\">max 0.03%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.03%<\/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;\">17.0 \u2013 19.0%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">18.0 \u2013 19.0%<\/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;\">7.0 \u2013 8.5%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">8.00 \u2013 9.50%<\/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;\">4.6 \u2013 5.2%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">4.60 \u2013 5.20%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Titanium (Ti)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.3 \u2013 0.5%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.55 \u2013 0.80%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Aluminium (Al)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.05 \u2013 0.15%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.05 \u2013 0.15%<\/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;\">min 1758 MPa (255 ksi)<\/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;\">Yield strength Rp0.2<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">min 1724 MPa (250 ksi)<\/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;\">Elongation (4D)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">min 6%<\/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;\">Hardness<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2265 48 HRC<\/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;\">Density<\/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;\">8000 kg\/m\u00b3<\/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;\">K92890<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">K93120<\/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;\">1.6359<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1.6358 \u00b7 1.6354<\/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;\">6512<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">6514 \u00b7 6521<\/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. Mechanical values are not given on our Maraging 300 datasheet, so those cells are left blank; certified values for the required heat treatment condition are shared at the order stage.<\/p>\n<h3>Which one, and when?<\/h3>\n<p><strong>Maraging 250 is sufficient<\/strong> \u2014 injection and forging dies, die cores, medium-duty actuator shafts, tooling parts where dimensional stability is critical. If the specification calls out <strong>AMS 6512<\/strong>, this is the grade being asked for.<\/p>\n<p><strong>Maraging 300 is required<\/strong> \u2014 aerospace fasteners, rocket motor casings and highly stressed shafts where a higher strength class is wanted. If the specification calls out <strong>AMS 6514<\/strong> or <strong>AMS 6521<\/strong>, 250 is not an acceptable substitute.<\/p>\n<h3>The top of the family<\/h3>\n<p>For higher strength there is <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/maraging-350\/\">Maraging 350<\/a>. If you are looking for a carbon-bearing alternative in the same strength class, <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aermet-100\/\">AerMet 100<\/a> and <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/300m\/\">300M<\/a> come into play; <a href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/300m-aermet-100-difference\/\">our comparison of those two is here<\/a>.<\/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\/maraging-250\/\">Maraging 250 \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\/maraging-300\/\">Maraging 300 \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 Maraging 250 and Maraging 300 lies in cobalt and titanium; both are carbon-free, nickel-based age-hardening steels.<\/p>\n","protected":false},"author":1,"featured_media":3275,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3946","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 Maraging 250 and Maraging 300? 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