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440C steel is a martensitic Stainless Steel. It contains 1.0% carbon and 16-18% chromium. It has strong rust resistance and is a high-quality stainless steel.
Scope of application: Mainly used to manufacture bearing parts that work in corrosive environments and non-lubricated strong oxidizing atmospheres. 440C has good high-temperature dimensional stability, so it can also be used as corrosion-resistant high-temperature bearing steel. In addition, it can also be used to manufacture high-quality knives, such as medical scalpels, scissors, nozzles, bearings, etc. 440C has a low ability to withstand dynamic loads.
UNS = Unified Numbering System
TYPE = Commonly used grade name
AMS = Aerospace Society for Testing and Materials
ASTM = American Society for Testing and Materials
FEDERAL = Federal specifications
| UNS | TYPE | AMS | ASTM | FEDERAL | CHARACTERISTICS |
| S44002 | 440A | 5631 | A-276A-314 | QQ-S-763 | 440 A, B, and C all have the same basic composition with varying high carbon contents. This produces higher strength/hardness with 440 versions. Corrosion resistant only in the hardened condition |
| S44003 | 440B | - | A-276 A-314 | QQ-S-763 | |
| S44004 | 440C | 56185630 5880 | A-276A-314 A-493 | QQ-S-763 |
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