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Stainless Steel 440

440C stainless is a high-carbon martensitic stainless steel that is capable of attaining a hardness of approximately 60 HRC. It is commonly used in knives, scissors and surgical tools.

Component Elements Properties Percent
Carbon .95 – 1.2%
Manganese (maximum) 1%
Silicon (maximum) 1%
Chromium 16 – 18%
Nickel (maximum) .75%
Copper (maximum) .5%
Molybdenum (maximum) .65%
Phosphorus (maximum) .04%
Sulfur (maximum) .3%

Select AMS Number:

AMS Number Alloy Type UNS Cross Ref. Spec Misc./Shape
AMS 5618 440 Stainless Steel S44004  
AMS 5618 Bar 440 Stainless Steel S44004 - Bar AMS 5618 Bar
AMS 5618 Forging 440 Stainless Steel S44004 - Forging AMS 5618 Forging
AMS 5618 Wire 440 Stainless Steel S44004 - Wire AMS 5618 Wire
AMS 5630 440 Stainless Steel S44004  
AMS 5630 Bar 440 Stainless Steel S44004 QQ-S-763 Bar AMS 5630 Bar
AMS 5630 Forging 440 Stainless Steel S44004 QQ-S-763 Forging AMS 5630 Forging
AMS 5630 Wire 440 Stainless Steel S44004 QQ-S-763 Wire AMS 5630 Wire
AMS 5631 440 Stainless Steel S44002  
AMS 5631 Bar 440 Stainless Steel S44002 - Bar AMS 5631 Bar
AMS 5631 Forging 440 Stainless Steel S44002 - Forging AMS 5631 Forging
AMS 5631 Wire 440 Stainless Steel S44002 - Wire AMS 5631 Wire
AMS 5632 440 Stainless Steel S44020  
AMS 5632 Bar 440 Stainless Steel S44020 - Bar AMS 5632 Bar
AMS 5632 Forging 440 Stainless Steel S44020 - Forging AMS 5632 Forging
AMS 5632 Wire 440 Stainless Steel S44020 - Wire AMS 5632 Wire
AMS 5880 440 Stainless Steel S44004  
AMS 5880 Bar 440 Stainless Steel S44004 - Bar AMS 5880 Bar
AMS 5880 Forging 440 Stainless Steel S44004 - Forging AMS 5880 Forging
AMS 5880 Wire 440 Stainless Steel S44004 - Wire AMS 5880 Wire