Stainless Steel, Precipitation HardeningAMS 5659 (15-5) Bar

A martensitic precipitation hardening chromium-nickel-copper stainless steel.

15-5 stainless steel is a martensitic precipitation-hardening stainless steel with approximately 15% chromium and 5% nickel. It has high strength, high hardness, and excellent corrosion resistance. Strength can be further increased by a single low temperature heat treatment. Compared to 17-4 , it offers better transverse toughness and ductility, better mechanical properties in larger cross-sections, and better forgeability.

It is readily weldable. It can be machined in any of the several thermal conditions available to this grade.

15-5 (AMS 5659) is used in a variety of industries including: Aerospace, chemical, food processing, general metal working, paper industries & petrochemical.

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Related Specifications

  • 15/5 PH
  • UNS S15500
  • AMS 5659


Chemical Composition


  • Aircraft components
  • Cylinders
  • Engine parts
  • Fittings
  • Gears
  • Hallow shafts
  • Marine gas turbine compressor sections
  • Paper mill equipment
  • Shafts
  • Valves


  • High strength
  • Excellent corrosion resistance
  • Good mechanical properties
  • Superior toughness than 17-4

Additional Information


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