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440C

UNS #S44004

440C is a high-carbon chromium steel designed to provide stainless properties with maximum hardness. It has been used primarily as a bearing steel, and is used in the hardened plus tempered condition. When heat-treated, 440C attains the highest hardness of any stainless steel (about HRC 60). 440C is not usually recommended for elevated temperature applications since corrosion resistance is reduced when used in the annealed condition or hardened and tempered above about 800ºF (427ºC).

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 (Maximum) 0.75
  • Iron (Nominal) Balance

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Applicable Specifications

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

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Strip

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Rod

Technical Information

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