17-7PH AMS 5644

17-7 PH is a semi-austenitic precipitation-hardening stainless steel that provides good corrosion resistance, good formability, and high strength.  It is commonly supplied in the annealed condition with capability to harden to high strength levels by heat treating to Conditions RH 950 and TH 1050.  17-7PH provides exceptional mechanical properties at temperatures up to 900 °F.

Common stock sizes: .375” to 4.000” diameters.

Common Specifications:

  • AMS 5644

  • ASTM-A564

  • General Electric S-400 / S-SPEC-35

Common Applications:

  • Springs

  • Washers

  • Blades

  • Fluid seal springs

The response to heat treatment tensile requirements are:

Minimum Longitudinal Tensile Properties:

Property Value
Tensile Strength, psi 170,000 min
Yield Strength at 0.2% Offset 140,000 min
Elongation % in 2 in. or 4D 6 min
Reduction of Area 25 min
Rockwell-Industries-Intl-17-7PH-ams-5644-image

Composition

Element Min. Max.
Carbon -- 0.09
Manganese -- 1.00
Silicon -- 1.00
Phosphorus -- 0.040
Sulfur -- 0.030
Chromium 16.00 18.00
Nickel 6.50 7.75
Aluminum 0.75 1.50