{"id":3984,"date":"2026-09-16T00:03:49","date_gmt":"2026-09-15T21:03:49","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3984"},"modified":"2026-09-17T23:06:32","modified_gmt":"2026-09-17T20:06:32","slug":"maraging-300-maraging-350-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/16\/maraging-300-maraging-350-difference\/","title":{"rendered":"What Is the Difference Between Maraging 300 and Maraging 350?"},"content":{"rendered":"

Maraging 300<\/strong> and Maraging 350<\/strong> are the top two steps of the carbon-free age-hardening steels. In both, carbon is max 0.03%<\/strong>; the strength comes not from carbon but from the intermetallic precipitates<\/strong> formed during ageing at 480\u2013510 \u00b0C.<\/p>\n

The number in the grade name states the nominal tensile strength in ksi: 300 ksi and 350 ksi.<\/p>\n

Cobalt and titanium up<\/h3>\n

According to our datasheets, nickel is at the same level in both grades: 18.0\u201319.0%<\/strong> in Maraging 300 and 18.5% (nominal)<\/strong> in Maraging 350. Molybdenum is similar as well (4.60\u20135.20% against 4.8% nominal).<\/p>\n

The difference comes down to two elements. Cobalt<\/strong> rises from 8.00\u20139.50% to 12.0%<\/strong>. Titanium<\/strong> rises from 0.55\u20130.80% to 1.40%<\/strong> \u2014 roughly double.<\/p>\n

Titanium is the direct source of the Ni\u2083Ti precipitates formed during ageing; the higher its content, the denser the precipitates and therefore the higher the strength. Cobalt lowers the solubility of molybdenum and so makes more Ni\u2083Mo precipitation possible \u2014 that is, it does not form precipitates itself but supports the formation of the others.<\/p>\n

The result is visible in the figures on our datasheet: after ageing, Maraging 350 reaches 2415 MPa (350 ksi)<\/strong> tensile and 2275 MPa (330 ksi)<\/strong> yield strength, with a hardness of 55\u201360 HRC<\/strong>. The price is ductility: elongation is at 8% (4D)<\/strong>.<\/p>\n

Comparison in numbers<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PROPERTY<\/th>\nMaraging 300<\/th>\nMaraging 350<\/th>\n<\/tr>\n<\/thead>\n
Nickel (Ni)<\/td>\n18.0 \u2013 19.0%<\/td>\n18.5% (nominal)<\/td>\n<\/tr>\n
Cobalt (Co)<\/td>\n8.00 \u2013 9.50%<\/td>\n12.0% (nominal)<\/td>\n<\/tr>\n
Molybdenum (Mo)<\/td>\n4.60 \u2013 5.20%<\/td>\n4.8% (nominal)<\/td>\n<\/tr>\n
Titanium (Ti)<\/td>\n0.55 \u2013 0.80%<\/td>\n1.40% (nominal)<\/td>\n<\/tr>\n
Aluminium (Al)<\/td>\n0.05 \u2013 0.15%<\/td>\n0.05 \u2013 0.15%<\/td>\n<\/tr>\n
Carbon (C)<\/td>\nmax 0.03%<\/td>\nmax 0.03%<\/td>\n<\/tr>\n
Manganese (Mn)<\/td>\nmax 0.10%<\/td>\n\u2014<\/td>\n<\/tr>\n
Silicon (Si)<\/td>\nmax 0.10%<\/td>\n\u2014<\/td>\n<\/tr>\n
Solution annealing<\/td>\n\u2014<\/td>\n820 \u2013 860 \u00b0C<\/td>\n<\/tr>\n
Ageing<\/td>\n\u2014<\/td>\n480 \u2013 510 \u00b0C<\/td>\n<\/tr>\n
Tensile strength Rm<\/td>\n\u2014<\/td>\n2415 MPa (350 ksi)<\/td>\n<\/tr>\n
Yield strength Rp0.2<\/td>\n\u2014<\/td>\n2275 MPa (330 ksi)<\/td>\n<\/tr>\n
Hardness<\/td>\n\u2014<\/td>\n55 \u2013 60 HRC<\/td>\n<\/tr>\n
Elongation<\/td>\n\u2014<\/td>\n8% (4D)<\/td>\n<\/tr>\n
Density<\/td>\n8000 kg\/m\u00b3<\/td>\n\u2014<\/td>\n<\/tr>\n
UNS<\/td>\nK93120<\/td>\n\u2014<\/td>\n<\/tr>\n
W.Nr (DIN\/EN)<\/td>\n1.6358 \u00b7 1.6354<\/td>\n\u2014<\/td>\n<\/tr>\n
AMS<\/td>\n6514 \u00b7 6521<\/td>\n6515<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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 are shared at the order stage.<\/p>\n

Which one, and when?<\/h3>\n

Maraging 300 is sufficient<\/strong> \u2014 aerospace fasteners, rocket motor casings, highly stressed shafts, forging and injection dies, actuator parts. The strength-to-toughness balance is at its best point in this class and it is easier to source. If the specification calls out AMS 6514<\/strong> or AMS 6521<\/strong>, this is the grade being asked for.<\/p>\n

Maraging 350 is required<\/strong> \u2014 parts where strength is the absolute priority and the section has to be reduced: racing and aerospace shafts, special die cores, high-performance fasteners. If the specification calls out AMS 6515<\/strong>, 300 is not an acceptable substitute.<\/p>\n

Note: the fracture toughness of the 350 class is lower than that of 300. In parts where crack tolerance is critical, the gain in strength is not always the right trade-off.<\/p>\n

The other members of the family<\/h3>\n

For the step below, see our Maraging 250 \u2013 300 comparison<\/a>; for a carbon-bearing alternative in the same strength class, our 300M \u2013 AerMet 100 article<\/a>.<\/p>\n

\n

Technical datasheets<\/p>\n

Maraging 300 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n

Maraging 350 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n

Both grades are supplied to order in round bar, flat bar, plate, sheet, pipe and forged forms. Contact us<\/a> for a quotation.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

With raised cobalt and titanium, Maraging 350 moves into a strength class above Maraging 300.<\/p>\n","protected":false},"author":1,"featured_media":3503,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3984","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comparisons"],"yoast_head":"\nWhat Is the Difference Between Maraging 300 and Maraging 350? - Defence Metal<\/title>\n<meta name=\"description\" content=\"With raised cobalt and titanium, Maraging 350 moves into a strength class above Maraging 300.\" \/>\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.defencemetal.com\/index.php\/2026\/09\/16\/maraging-300-maraging-350-difference\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is the Difference Between Maraging 300 and Maraging 350? 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