15-5 PH (UNS S15500 / W.Nr. 1.4545)

15-5 PH (UNS S15500 / W.Nr. 1.4534) 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 PH, 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.

Equivalent Grades

15-5 PHXM-12S15500X4CrNiCuNb1641.4545

Chemical Composition, %

15-5 PH≤0.07≤1.0≤1.0≤0.04≤0.0314.0-15.53.5-5.50.15-0.452.5-4.5Bal

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HRB

Available Products and Specifications

Rod, Bar, Wire and ForgingsASTM A564, 705, SAE AMS 5659.
Plate, Sheet and StripASTM A693, SAE AMS 5862
Pipe and Tube
Welding Product


  • Precipitation Hardening
  • High Strength
  • Moderate corrosion resistance to 600°F


  • Aerospace structural components
  • Valves
  • Gears and Shafts
  • Oil and Gas components
  • Nuclear reactor components