{"id":3947,"date":"2026-09-15T22:28:58","date_gmt":"2026-09-15T19:28:58","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3947"},"modified":"2026-09-17T23:07:15","modified_gmt":"2026-09-17T20:07:15","slug":"aisi-4140-h11-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-4140-h11-difference\/","title":{"rendered":"What Is the Difference Between AISI 4140 and H11?"},"content":{"rendered":"

AISI 4140<\/strong> and H11<\/strong> are very similar in carbon content \u2014 both are around 0.40% carbon. Even so, they belong to different classes: 4140 is a quenched and tempered steel<\/strong>, while H11 is a hot work tool steel<\/strong>. The element that separates them is chromium.<\/p>\n

1% chromium against 5% chromium<\/h3>\n

In AISI 4140 chromium is 1.00%<\/strong> and molybdenum 0.25%. In H11 chromium rises to 5.00%<\/strong>, molybdenum rises to 1.30%, and 0.50% vanadium<\/strong> is added to the composition. Silicon also rises from 0.25% to 0.90%.<\/p>\n

That composition gives H11 its resistance to tempering<\/strong>: the part does not lose its hardness while working at high temperature. 4140, by contrast, softens as it heats up. Even at room temperature the difference is large \u2014 according to our datasheets, H11 gives a tensile strength of 1793 MPa<\/strong> when hardened and tempered, while AISI 4140 is at 930 MPa<\/strong> in a 50 mm section.<\/p>\n

Comparison in numbers<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PROPERTY<\/th>\nAISI 4140<\/th>\nH11<\/th>\n<\/tr>\n<\/thead>\n
Carbon (C)<\/td>\n0.40%<\/td>\n0.40%<\/td>\n<\/tr>\n
Chromium (Cr)<\/td>\n1.00%<\/td>\n5.00%<\/td>\n<\/tr>\n
Molybdenum (Mo)<\/td>\n0.25%<\/td>\n1.30%<\/td>\n<\/tr>\n
Vanadium (V)<\/td>\n\u2014<\/td>\n0.50%<\/td>\n<\/tr>\n
Silicon (Si)<\/td>\n0.25%<\/td>\n0.90%<\/td>\n<\/tr>\n
Manganese (Mn)<\/td>\n0.85%<\/td>\n0.30%<\/td>\n<\/tr>\n
Tensile strength Rm<\/td>\n930 MPa (50 mm section)<\/td>\n1793 MPa<\/td>\n<\/tr>\n
Yield strength Rp0.2<\/td>\n770 MPa (50 mm section)<\/td>\n1482 MPa<\/td>\n<\/tr>\n
Elongation<\/td>\n17% (50 mm section)<\/td>\n8%<\/td>\n<\/tr>\n
Reduction of area<\/td>\n\u2014<\/td>\n30%<\/td>\n<\/tr>\n
UNS<\/td>\nG41400<\/td>\n\u2014<\/td>\n<\/tr>\n
AMS<\/td>\n6349 \u00b7 6382<\/td>\n6485 \u00b7 6487<\/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 4140 is preferred<\/strong> \u2014 shafts, gear bodies, fasteners, hydraulic components, general machine manufacturing. It is the first steel that comes to mind wherever moderate strength is required at room temperature; it is easy to source and easy to machine.<\/p>\n

H11 is required<\/strong> \u2014 hot forging dies, extrusion dies, die casting components and aerospace parts carrying load at high temperature. If the specification calls out AMS 6485<\/strong> or AMS 6487<\/strong>, the grade being asked for is H11; 4140 is not an acceptable substitute.<\/p>\n

Neighbouring alloys<\/h3>\n

For the step above 4140, see our AISI 4140 \u2013 AISI 4340 comparison<\/a>; for much higher strength at room temperature, see the 300M<\/a> and AerMet 100<\/a> pages.<\/p>\n

\n

Technical datasheets<\/p>\n

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

H11 \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":"

AISI 4140 is a quenched and tempered steel, H11 a 5% chromium hot work tool steel. The difference becomes clear in parts working hot.<\/p>\n","protected":false},"author":1,"featured_media":3278,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3947","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comparisons"],"yoast_head":"\nWhat Is the Difference Between AISI 4140 and H11? - Defence Metal<\/title>\n<meta name=\"description\" content=\"AISI 4140 is a quenched and tempered steel, H11 a 5% chromium hot work tool steel. 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