UNS #S15500

15Cr-5Ni is a martensitic precipitation hardening stainless steel offering high strength and hardness along with excellent corrosion resistance. Generally similar to Custom 630 (17Cr-4Ni) in composition and properties, 15Cr-5Ni is chemically balanced to eliminate all but trace amounts of delta ferrite, thus providing superior transverse toughness and ductility plus a high degree of forgeability. Its fabrication characteristics are similar to those of other precipitation hardening stainlesses, and it can be aged-hardened by a single step, low temperature treatment.

Type Analysis

  • Carbon (Maximum) 0.07
  • Phosphorus (Maximum) 0.04
  • Silicon (Maximum) 1
  • Nickel (Nominal) 3.50-5.50
  • Manganese (Maximum) 1
  • Sulfur (Maximum) 0.015
  • Chromium (Nominal) 14.00-15.50
  • Iron (Nominal) Balance
  • Copper (Nominal) 2.50-4.50
  • Columbium + Tantalum0.15-0.45


valve parts, fittings and fasteners, shafts, gears, engine parts, chemical process equipment, paper mill equipment, aircraft components and nuclear reactor components.

Applicable Specifications

  • AMS 5658
  • AMS 5862
  • ASTM A564 (Grade XM-12)
  • ASTM A705 (Grade XM-12)
  • AMS 5659
  • ASME SA705
  • ASTM A693 (Grade XM-12)


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