{"id":3944,"date":"2026-09-15T22:20:45","date_gmt":"2026-09-15T19:20:45","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3944"},"modified":"2026-09-17T23:07:18","modified_gmt":"2026-09-17T20:07:18","slug":"aisi-4340-300m-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-4340-300m-difference\/","title":{"rendered":"What Is the Difference Between AISI 4340 and 300M?"},"content":{"rendered":"

In aerospace specifications, AISI 4340<\/strong> and 300M<\/strong> often appear side by side. There is a reason for that: 300M is not a separate alloy designed from scratch but a strengthened derivative of 4340<\/strong>. The nickel, chromium and molybdenum backbone is almost identical; the difference comes down to two elements.<\/p>\n

Silicon and vanadium<\/h3>\n

In AISI 4340 silicon is in the 0.15\u20130.30%<\/strong> range. In 300M it rises to 1.45\u20131.80%<\/strong>, roughly six times as much. To that is added 0.05\u20130.10% vanadium<\/strong>, and molybdenum is raised from 0.20\u20130.30% to 0.30\u20130.50%.<\/p>\n

The raised silicon content makes the steel resist softening during tempering. That allows the part to be tempered at a higher temperature; stress is relieved while strength is retained. Vanadium, in turn, refines the grain structure. The result shows directly in the figures on our datasheets: where 4340 gives a tensile strength of 1793 MPa<\/strong> when hardened and tempered, 300M reaches 1861\u20131931 MPa<\/strong> with the same treatment.<\/p>\n

Comparison in numbers<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PROPERTY<\/th>\nAISI 4340<\/th>\n300M<\/th>\n<\/tr>\n<\/thead>\n
Carbon (C)<\/td>\n0.38 \u2013 0.43%<\/td>\n0.38 \u2013 0.45%<\/td>\n<\/tr>\n
Silicon (Si)<\/td>\n0.15 \u2013 0.30%<\/td>\n1.45 \u2013 1.80%<\/td>\n<\/tr>\n
Nickel (Ni)<\/td>\n1.65 \u2013 2.00%<\/td>\n1.65 \u2013 2.00%<\/td>\n<\/tr>\n
Chromium (Cr)<\/td>\n0.70 \u2013 0.90%<\/td>\n0.70 \u2013 0.95%<\/td>\n<\/tr>\n
Molybdenum (Mo)<\/td>\n0.20 \u2013 0.30%<\/td>\n0.30 \u2013 0.50%<\/td>\n<\/tr>\n
Vanadium (V)<\/td>\n\u2014<\/td>\n0.05 \u2013 0.10%<\/td>\n<\/tr>\n
Tensile strength Rm<\/td>\n1793 MPa (260 ksi)<\/td>\n1861 \u2013 1931 MPa (270 \u2013 280 ksi)<\/td>\n<\/tr>\n
Yield strength Rp0.2<\/td>\n1496 MPa (217 ksi)<\/td>\n1517 \u2013 1586 MPa (220 \u2013 230 ksi)<\/td>\n<\/tr>\n
Elongation<\/td>\n10%<\/td>\n7 \u2013 8%<\/td>\n<\/tr>\n
UNS<\/td>\nG43406<\/td>\n\u2014<\/td>\n<\/tr>\n
AMS<\/td>\n6414 \u00b7 6415 \u00b7 6484<\/td>\n6257 \u00b7 6417 \u00b7 6419<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Values are taken from our product datasheets; section thickness and the applied heat treatment regime change the result.<\/p>\n

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

AISI 4340 is preferred<\/strong> \u2014 shafts, gear bodies, critical fasteners and general aerospace parts where strength in the 1700\u20131800 MPa class is enough. It is easier to source, and its machining and heat treatment are more widely understood.<\/p>\n

300M is required<\/strong> \u2014 landing gear components, aircraft arresting hooks, highly stressed forgings. Strength is gained at the cost of a somewhat lower elongation than 4340; 300M is used where that trade-off is acceptable. If the specification calls out AMS 6417<\/strong> or AMS 6419<\/strong>, 4340 is not an acceptable substitute.<\/p>\n

A step up<\/h3>\n

Where even 300M is not enough and the same strength is wanted with far higher toughness, AerMet 100<\/a> comes into the picture; our comparison of the two is here<\/a>. For the step below 4340, see the AISI 4140 \u2013 AISI 4340 comparison<\/a>.<\/p>\n

\n

Technical datasheets<\/p>\n

AISI 4340 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n

300M \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":"

300M is essentially an AISI 4340 derivative with raised silicon and vanadium. The strength difference and landing gear applications.<\/p>\n","protected":false},"author":1,"featured_media":3273,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3944","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comparisons"],"yoast_head":"\nWhat Is the Difference Between AISI 4340 and 300M? - Defence Metal<\/title>\n<meta name=\"description\" content=\"300M is essentially an AISI 4340 derivative with raised silicon and vanadium. 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