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PH13-8Mo Bar, AMS 5629

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PH 13-8 Mo is a precipitation-hardening martensitic stainless steel that has excellent strength, high hardness, superior toughness, and good corrosion resistance. It is double vacuum melted in a VIM-VAR process. 13-8 steel provides a wide range of properties through a single precipitation hardening heat treatment. Its corrosion resistance is similar to 304 stainless, with greatest resistance in the fully hardened conditions.

Common applications are: Aerospace components, components in the petrochemical and nuclear industries, injection molding equipment.

Bars shall be solution heat treated by heating to 1700 °F ± 25 °F, holding at heat for a time commensurate with section thickness, heating equipment, and procedure used, and cooling to below 60 °F.

Hardness of bars shall not exceed 363 HB. See precipitation hardening parameters and minimum tensile properties below:

Rockwell Industries PH 13-8 Precipitation Heat Treating Parameters Rockwell-Industries-PH-13-8-Minimum-Tensile-Properties

Common Specifications:

  • AMS 5629
  • Pratt & Whitney LCS F-17
  • General Electric S-400 / S-SPEC-35
  • ASTM A564; CAPABLE OF H1000
  • ASTM F899 XM-13
  • HMS 6-1105 (EXCEPT SONIC)
  • DMS 2100 GRADE B
  • UNS S13800

Average grain size for diameters up to 3” = ASTM No. 5 or finer

Average grain size for diameters over 3” = ASTM No. 4 or finer

Industry Trade Names:


Rockwell Industries PH13-8-Mo Macrostructure Limits

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

Rockwell-Industries-15-5PH AMS-5659





Carbon -- 0.05
Manganese -- 0.10
Silicon -- 0.10
Phosphorus -- 0.010
Sulfur -- 0.008
Chromium 12.25 13.25
Nickel 7.50 8.50
Molybdenum 2.00 2.50
Aluminum 0.90 1.35
Nitrogen -- 0.010

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