Stainless Grade 440C is a high-carbon chromium steel that was engineered to have stainless properties with maximum hardness. It is used mostly as a bearing steel and in the hardened and tempered condition. 440C can be heat treated but will have about a Rockwell 60 C scale, the hardest stainless steel.
440C has corrosion resistance in normal domestic environments and very mild industrial environments, including many petroleum products and organic materials.
UNS S44004, AISI 440C, AMS 5618, AMS 5630, AMS 6990, ASTM A276, ASTM A314, ASTM A473, ASTM A493, ASTM A690, ASTM A756, QQ-S-763
440C Bearing Quality: AMS 5630, AMS 5880, ASTM A-276, ASTM A-756
Bearing assemblies, balls and races. Cutlery, knives, mold inserts, needle valves, ball check valves, aircraft parts, oil well pump parts, valve seats, pump parts, ball studs, nozzles, surgical tools, bushings, wear resistant components.