431

UNS #S43100

431 stainless is designed to provide improved corrosion resistance and toughness in a quench-hardenable stainless steel. Its mechanical properties include excellent impact strength at relatively high hardness level with the best corrosion resistance of the conventional martensitic stainless grades. Ideal for applications that require precision machining of components with high reproducibility and uniformity and the optimum combination of corrosion resistance, hardness and toughness from approximately -100 to 1200°F (-73 to 650°C)

Type Analysis

  • Carbon (Maximum) 0.2
  • Phosphorus (Maximum) 0.04
  • Silicon (Maximum) 1
  • Nickel (Nominal) 1.25-2.50
  • Manganese (Maximum) 1
  • Sulfur (Maximum) 0.03
  • Chromium (Nominal) 15.00-17.00
  • Iron (Nominal) Balance

Applications

Aircraft fasteners and fittings, bomb racks, bolting, pump shafts, valve stems, structural components exposed to marine atmosphere, and for highly stressed aircraft components.

Applicable Specifications

  • ASTM A276
  • AMS 5628
  • ASTM A314
  • ASTM A479
  • ASTM A580
  • MIL-S-18732

Bar

Billet

Rod

Rounds

Strip

Wire

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