{"id":3953,"date":"2026-09-15T22:34:31","date_gmt":"2026-09-15T19:34:31","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3953"},"modified":"2026-09-17T23:07:08","modified_gmt":"2026-09-17T20:07:08","slug":"aisi-420-aisi-440c-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-420-aisi-440c-difference\/","title":{"rendered":"What Is the Difference Between AISI 420 and AISI 440C?"},"content":{"rendered":"

AISI 420<\/strong> and AISI 440C<\/strong> are the two ends of the same family: both are martensitic stainless steels and both are used in the hardened condition. The difference comes down to how far the carbon and chromium contents are raised.<\/p>\n

Carbon rises fourfold<\/h3>\n

In AISI 420 carbon is 0.16\u20130.25%<\/strong> and chromium 12\u201314%. In AISI 440C carbon is 0.95\u20131.20%<\/strong> and chromium 16.0\u201318.0%<\/strong>. Carbon rises roughly fourfold.<\/p>\n

Carbon that high leads to the formation of a great many chromium carbides<\/strong> in the structure during hardening. Those carbides are extremely hard and give the material outstanding wear resistance<\/strong>. According to our datasheet, 440C reaches a hardness of 58\u201362 HRC<\/strong> when austenitised at 1010\u20131065 \u00b0C and tempered at 150\u2013250 \u00b0C.<\/p>\n

The price is toughness. The elongation of 440C is in the 2\u20135%<\/strong> range \u2014 the material is hard but brittle. Because part of the chromium is tied up in carbides, its corrosion resistance stays behind that of the austenitic grades despite the high chromium content.<\/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
PROPERTY<\/th>\nAISI 420<\/th>\nAISI 440C<\/th>\n<\/tr>\n<\/thead>\n
Carbon (C)<\/td>\n0.16 \u2013 0.25%<\/td>\n0.95 \u2013 1.20%<\/td>\n<\/tr>\n
Chromium (Cr)<\/td>\n12 \u2013 14%<\/td>\n16.0 \u2013 18.0%<\/td>\n<\/tr>\n
Molybdenum (Mo)<\/td>\n\u2014<\/td>\nmax 0.75%<\/td>\n<\/tr>\n
Manganese (Mn)<\/td>\nmax 1.00%<\/td>\nmax 1.0%<\/td>\n<\/tr>\n
Hardness<\/td>\nmax 196 HB (annealed)<\/td>\n58 \u2013 62 HRC (hardened)<\/td>\n<\/tr>\n
Tensile strength Rm<\/td>\n655 MPa (annealed)<\/td>\n760 \u2013 1950 MPa (depending on condition)<\/td>\n<\/tr>\n
Yield strength Rp0.2<\/td>\n345 MPa (annealed)<\/td>\n450 \u2013 1700 MPa<\/td>\n<\/tr>\n
Elongation<\/td>\n25% (annealed)<\/td>\n2 \u2013 5%<\/td>\n<\/tr>\n
Austenitising<\/td>\n\u2014<\/td>\n1010 \u2013 1065 \u00b0C<\/td>\n<\/tr>\n
Tempering<\/td>\n\u2014<\/td>\n150 \u2013 250 \u00b0C<\/td>\n<\/tr>\n
Wear resistance<\/td>\nModerate<\/td>\nVery high<\/td>\n<\/tr>\n
UNS<\/td>\nS42000<\/td>\nS44004<\/td>\n<\/tr>\n
W.Nr (DIN\/EN)<\/td>\n1.4021<\/td>\n1.4125<\/td>\n<\/tr>\n
AMS<\/td>\n5506 \u00b7 5620 \u00b7 5621<\/td>\n5618 \u00b7 5630 \u00b7 5880<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Values are taken from our product datasheets. The AISI 420 values are for the annealed condition; the values after hardening depend on the regime applied.<\/p>\n

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

AISI 420 is sufficient<\/strong> \u2014 plastic injection moulds, general purpose knives, surgical hand instruments, shafts and pins, parts with a moderate wear load. It is more economical and far easier to machine.<\/p>\n

AISI 440C is required<\/strong> \u2014 stainless bearing balls and races, valve components, high-quality knife edges, pump wear rings, precision parts working in abrasive environments. If the specification calls out AMS 5618<\/strong> or AMS 5630<\/strong>, the grade being asked for is 440C.<\/p>\n

The decisive question in the choice is this: is the part exposed to impact, or to wear? If there is impact, the 420 family is the right side; if it is pure wear, 440C is.<\/p>\n

Intermediate grades<\/h3>\n

For hardness requirements between the two there are AISI 420B<\/a> and AISI 420C<\/a>, and for a tougher martensitic grade AISI 431<\/a>. For the entry grade of the family, see our AISI 410 \u2013 AISI 420 comparison<\/a>.<\/p>\n

\n

Technical datasheets<\/p>\n

AISI 420 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n

AISI 440C \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 440C contains far more carbon than 420 and reaches 58\u201362 HRC; 420 stays tougher and is more economical.<\/p>\n","protected":false},"author":1,"featured_media":3296,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3953","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comparisons"],"yoast_head":"\nWhat Is the Difference Between AISI 420 and AISI 440C? - Defence Metal<\/title>\n<meta name=\"description\" content=\"AISI 440C contains far more carbon than 420 and reaches 58\u201362 HRC; 420 stays tougher and is more economical.\" \/>\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\/15\/aisi-420-aisi-440c-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 AISI 420 and AISI 440C? 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