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17-4PH Stainless Steel


17-4PH 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.

Shapes Available

Square Bar

Sheet / Plate

Circle / Round Bar

Hexagon Bar

Flat / Rectangle Bar



17-4 PH is used in the following other applications:

  • Fasteners
  • Gears
  • Pump Shafts


Chemical Composition, %

Ni Cr Mo Mn Cu Si C S Cb+Ta P Fe
MIN 3.0 15.0 - - 3.0 - - - 5xC - -
MAX 5.0 17.5 .05 1.0 4.0 1.0 .07 .03 .45 .07 Bal


  • UNS 517400
  • ASTM: A693, A564, A705
  • ASTM TYPE 630
  • ASME SA693, SA564, SA705
  • ASME TYPE 630

Industry Names

  • 17-4PH
  • 17-4 Stainless
  • 630


  • Corrosion resistant
  • High Tensile and Hardness up to 600 degrees F

Mechanical Properties

Representative Tensile Properties (cold worked)
 Density 0.282lb/inch3
  MeltingRange 2560-2625°F
  Poisson"sRatio 0.272
  ElectricalResistivity 463Ohm-circmil/ft