17-7 PH (UNS S17700 / W.Nr. 1.4541)

17-7 PH (UNS S17700 / W.Nr. 1.4541) is a precipitation-hardened stainless steel that is well suited for aerospace and other applications requiring high strength and good corrosion resistance and formability.  Type 17-7 PH is a Chromium-Nickel-Aluminum, austenitic stainless steel.  It is the most formable of all PH grades and has the highest strength and hardness.  It is less magnetic than other PH grades and offers minimal distortion upon heat treatment. This material maintains its valuable properties at temperatures up to 800° F (427° C).

Equivalent Grades

17-7 PH631S177001.4541

Chemical Composition, %

17-7 PH≤0.09≤1.0≤1.0≤0.04≤0.0316.0-18.06.5-7.75Bal

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 applications
  • Chemical processing equipment
  • Oil and petroleum refining equipment
  • Food grade stainless steel for processing equipment
  • General metalworking