440A

UNS #S44002

440A is a high-carbon high-chromium martensitic stainless steel designed to provide stainless properties with excellent hardness. The alloy has an excellent combination of strength, ductility, toughness, corrosion resistance, and fabricability. It attains a hardness of Rockwell C 56 and maximum toughness when heat treated and has good toughness at cryogenic temperatures and relatively high tensile and yield strengths at moderately high elevated temperatures. These properties further increase the versatility and usefulness of the alloy.

Type Analysis

  • Carbon (Maximum) 0.60-0.75
  • Phosphorus (Maximum) 0.04
  • Silicon (Maximum) 1
  • Manganese (Maximum) 1
  • Sulfur (Maximum) 0.03
  • Chromium (Nominal) 16.00-18.00
  • Cobalt (Nominal) 0.1
  • Molybdenum (Nominal) 0.75
  • Iron (Nominal) Balance

Applications

pivot pins, dental and surgical instruments, cutlery, valve shafts, taper pins, pumps and fittings, fasteners, cables, chains, screens, wire cloth, marine hardware, boat shafting, heat exchanger parts, springs, and photographic process equipment

Applicable Specifications

  • ASTM A276
  • ASTM A314
  • ASTM A473
  • ASTM A580
  • ASTM F899
  • AMS 5631
  • QQ-S-763

Bar

Billet

Rod

Rounds

Strip

Wire

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