17-4 PH (UNS S17400 / W.Nr. 1.4542)

17-4 PH (UNS S17400 / W.Nr. 1.4542) stainless steel is the most widely used of all of the precipitation-hardening stainless steels. Its valuable combination of properties gives designers opportunities to add reliability to their products while simplifying fabrication and often reducing costs. Type 17-4 PH is a martensitic precipitation-hardening stainless steel that provides an outstanding combination of high strength, good corrosion resistance, and good mechanical properties at temperatures up to 600°F (316°C). Its unique combination of properties make this alloy an effective solution to many design and production problems.

Equivalent Grades

17-4 PH05Cr17Ni4Cu4Nb630S17400X5CrNiCuNb16.41.4542

Chemical Composition, %

17-4 PH≤0.07≤1.0≤1.0≤0.04≤0.0315.0-17.53.0-5.00.15-0.453.0-5.0Bal

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 5669
Plate, Sheet and StripASTM A693, SAE AMS 5862
Pipe and Tube
Welding Product


  • Excellent resistance to corrosion
  • Provide toughness in both base metals and welds.
  • Well suited to applications that require ease of fabrication and then the addition of strength/hardness for improved reliability


  • Aerospace – structural and parts
  • Biomedical – hand tools
  • Chemical Processing
  • Food Process Equipment
  • Gate Valves
  • Mechanical Components
  • Nuclear Waste Processing and Storage
  • Oil and Gas Production – foils, helicopter deck platforms, etc.
  • Pulp and Paper – paper mill equipment