{"id":3942,"date":"2026-09-15T21:33:06","date_gmt":"2026-09-15T18:33:06","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3942"},"modified":"2026-09-17T23:07:21","modified_gmt":"2026-09-17T20:07:21","slug":"aisi-4140-aisi-4340-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-4140-aisi-4340-difference\/","title":{"rendered":"What Is the Difference Between AISI 4140 and AISI 4340?"},"content":{"rendered":"

The two most frequently compared alloy steels in aerospace, defence and energy projects are AISI 4140<\/strong> and AISI 4340<\/strong>. Both are quenched and tempered steels, both contain chromium and molybdenum, and both are supplied in the same forms. The real difference between them comes down to a single element: nickel<\/strong>.<\/p>\n

What nickel does<\/h3>\n

Looking at the compositions in the Defence Metal datasheets, AISI 4140 is chromium\u2013molybdenum based: roughly 1.00% chromium, 0.25% molybdenum and 0.40% carbon, with no nickel at all. AISI 4340 adds 1.65\u20132.00% nickel<\/strong> on top of that same chromium\u2013molybdenum backbone.<\/p>\n

Nickel increases the steel\u2019s hardenability<\/strong>. That means not only the surface of the part hardens, but the core of the section as well. For a thick shaft, a gear body or a landing gear component, that difference translates directly into the strength of the part. Nickel also raises toughness<\/strong> (impact resistance) after tempering; the part reaches high strength without becoming brittle.<\/p>\n

Comparison in numbers<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
PROPERTY<\/th>\nAISI 4140<\/th>\nAISI 4340<\/th>\n<\/tr>\n<\/thead>\n
Carbon (C)<\/td>\n0.40%<\/td>\n0.38\u20130.43%<\/td>\n<\/tr>\n
Chromium (Cr)<\/td>\n1.00%<\/td>\n0.70\u20130.90%<\/td>\n<\/tr>\n
Molybdenum (Mo)<\/td>\n0.25%<\/td>\n0.20\u20130.30%<\/td>\n<\/tr>\n
Nickel (Ni)<\/td>\n\u2014<\/td>\n1.65\u20132.00%<\/td>\n<\/tr>\n
Quenched + tempered<\/td>\nRm 930 MPa (50 mm section)<\/td>\nRm 1793 MPa<\/td>\n<\/tr>\n
Yield (Rp0.2)<\/td>\n770 MPa (50 mm section)<\/td>\n1496 MPa<\/td>\n<\/tr>\n
UNS<\/td>\nG41400<\/td>\nG43406<\/td>\n<\/tr>\n
AMS<\/td>\n6349 \u00b7 6382<\/td>\n6414 \u00b7 6415 \u00b7 6484<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Values are taken from our product datasheets. The AISI 4140 values are for a 50 mm section and the AISI 4340 values are for the quenched + tempered condition; section thickness and the heat treatment regime change the result.<\/p>\n

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

AISI 4140 is sufficient<\/strong> \u2014 medium-section shafts, fasteners, die bodies, hydraulic components, general machine manufacturing. It is easier to source, it machines well, and you do not pay for more alloy than you need.<\/p>\n

AISI 4340 is required<\/strong> \u2014 when through-hardness to the core is needed in a thick section, when toughness is required together with high strength, and when the specification calls out AMS 6414 \/ AMS 6415 directly. If those two AMS numbers appear on an aerospace drawing, 4140 is not an acceptable substitute.<\/p>\n

A step up<\/h3>\n

Where even 4340 is not enough, the next step is higher-strength alloys such as 300M<\/a> and AerMet 100<\/a>. On the case-hardening (carburising) side of the same family you will find AISI 8620<\/a> and AISI 9310<\/a>.<\/p>\n

\n

Technical datasheets<\/p>\n

AISI 4140 \u2014 chemical composition, mechanical values, AMS equivalents<\/a><\/p>\n

AISI 4340 \u2014 chemical composition, mechanical values, AMS 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":"

The key difference between AISI 4140 and AISI 4340 is nickel. Chemical composition, mechanical values, AMS\/UNS equivalents and which to choose for which application.<\/p>\n","protected":false},"author":1,"featured_media":3271,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3942","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comparisons"],"yoast_head":"\nWhat Is the Difference Between AISI 4140 and AISI 4340? - Defence Metal<\/title>\n<meta name=\"description\" content=\"The key difference between AISI 4140 and AISI 4340 is nickel. 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