17-4 Stainless Steel

Shapes Available

  • Flat Bar
  • Hex Bar
  • Plate
  • Round Bar
  • Sheet
  • Square Bar


  • Aerospace
  • Manufacturing
  • Nuclear
  • Wind Power

Industry Names

  • 17-4PH
  • 17-4 Stainless
  • 630


  • Stainless Steel


  • AMS 5622
  • AMS 5643
  • ASME SA693
  • ASME TYPE 630
  • ASTM TYPE 630
  • UNS 517400


  • Fasteners
  • Gears
  • Pump Shafts


  • Corrosion Resistant
  • High Tensile and Hardness up to 600° F

17-4 Stainless Steel is a highly versatile and widely used precipitation-hardening alloy used in a number of aerospace, nuclear energy and chemical processing applications. One of the original “PH” (precipitation hardening) grades, 17-4 delivers a combination of oxidation and corrosion resistance along with a high strength, toughness and capability of achieving numerous quality mechanical properties through heat treating at various temperature ranges. 17-4 can be machined in the annealed condition and in the heat treated state. Maximum toughness is achieved by aging at 1150°F, while maximum strength is attained through aging at 900°F.

For more information on 13-8 and other PH grades, click here.

Check out the transcript on our 17-4 video here. You can watch the video below:

Please contact us to request a quote. We specialize in hard to find material.

We work closely with many manufacturers in the aerospace & defense industry. We work with NADCAP approved heat treaters and testing laboratories. We can supply DFARS compliant material.

Metal Properties
Electrical Resistivity 463 Ohms (circ mil./ft.)
Melting Range 2560-2625 °F
Poisson's Ratio 0.272
Density 0.282 lb/inch³
Chemical Composition
C- .07
Cb+Ta5xC .45
Cr15.0 17.5
Cu3.0 4.0
Fe- Bal
Mn- 1.0
Mo- .05
Ni3.0 5.0
P- .07
S- .03
Si- 1.0
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