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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” 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. It 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