440C

UNS #S44004

440C stainless is a high-carbon chromium steel designed to provide stainless properties with maximum hardness. When heat-treated, it attains the highest hardness of any stainless steel at approximately Rockwell C 60. It has been used primarily as a bearing steel and is used in the hardened plus tempered condition.

Type Analysis

  • Carbon (Maximum) 0.95-1.20
  • Phosphorus (Maximum) 0.04
  • Silicon (Maximum) 1
  • Manganese (Maximum) 1
  • Sulfur (Maximum) 0.03
  • Chromium (Nominal) 16.00 -18.00
  • Molybdenum (Nominal) 0.75
  • Iron (Nominal) Balance

Applications

balls and races, cutlery, needle valves, ball check valves, valve seats, pump parts, ball studs, bushings, and wear-resistant textile components.

Applicable Specifications

  • AMS 5618
  • AMS 5880
  • AMS 5630
  • ASTM A276
  • ASTM A314
  • ASTM A493
  • ASTM A756
  • ASTM A473
  • ASTM A580
  • QQ-S-763

Bar

Billet

Fine

Rod

Rounds

Wire

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