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15-5PH Bar, AMS 5659

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15-5 PH stainless steel from Rockwell Industries is a martensitic precipitation-hardening steel which maintains a high strength to approximately 600°F. Common applications of 15-5PH are aerospace structural components, shafts and gears, fasteners, and valves.

Bars shall be solution heat treated in accordance with AMS-H-6875 by heating to 1900 °F ± 25 °F, holding at heat for a time commensurate with section thickness, heating equipment, and procedure used, and cooling as required to below 90 °F.

Minimum tensile properties in precipitation heat treated conditions:


As solution treated the tensile strength shall not exceed 175 ksi and hardness shall not exceed 363 HB. Precipitation heat treating procedures:

Rockwell Industries 15-5 PH Precipitation Heat Treating Parameters

Common Specifications:

  • AMS 5659 TYPE 1
  • Pratt & Whitney LCS F-17
  • General Electric S-400 / S-SPEC-35
  • ASTM-A484
  • ASTM-A564; CAP. OF H900
  • ASME-SA564; CAP. OF H900

AMS 5659 Type 1 = VAR melting process

AMS 5659 Type 2 = ESR melting process

Industry Trade Names:

Rockwell Industries 15-5 PH Macrostructure Limits

Our common stock sizes from .500” to 8.00” diameters.

Rockwell-Industries-15-5PH AMS-5659





Carbon -- 0.07
Manganese -- 1.00
Silicon -- 1.00
Phosphorus -- 0.030
Sulfur -- 0.015
Chromium 14.00 15.50
Nickel 3.50 5.50
Columbium (Niobium) 5xC 0.45
Copper 2.50 4.50
Molybdenum -- 0.50

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