13-8 PH STAINLESS STEEL – AMS 5629 – UNS S13800

13-8 PH is a martensitic precipitation-hardening stainless steel. This alloy is double melted in a Vacuum Induction Furnace followed by Consumable Electrode Vacuum Melt (VIM-VAR); or in some cases, 2nd melt is by Electroslag Remelting (ESR) as specified by the consumer. It exhibits excellent strength, high hardness, superior toughness, and good corrosion resistance. Good transverse toughness properties are achieved by tight chemical composition control, low carbon content, and vacuum melting. 13-8 PH steel provides a wide range of properties through a single precipitation hardening heat treatment. It is weldable; inert gas shielding with Helium is preferred. Corrosion resistance is similar to 304 Stainless, with greatest resistance in the fully hardened conditions.

13-8PH Stainless Steel Plate
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Service Steel Aerospace is the largest U.S. stocking distributor of 13-8 PH stainless steel. It is available predominantly in Bars, Wire, Forgings, Rings and Extrusions per AMS 5629. It is also available in Sheet and Plate.

13-8 PH stainless steel is typically used in the following applications:

Used primarily for parts requiring corrosion resistance, stress-corrosion, and high strength 600°F (316°C), with good ductility and strength in transverse direction for

  • Aerospace components
  • Injection molding equipment
  • Waterjet cutting equipment
  • Petrochemical industries
  • Nuclear industries
  • Common Specifications:


  • AMS 5629 Bars, Forgings, Wire, Extrusions
    • - Rounds 12" max diameter
    • - Hexagons 12" max across flat sides
    • - 12" max least distance parallel sides
    • - Stock of any size for forgings, flash welded rings, or extrusion
  • AMS 5629/H1000 (produced & precipitation hardened to H1000 condition)
  • AMS 5864 (Plate)
  • ASTM A564 (Type XM-13 Bars, Wires, Shapes)
  • ASTM A693 (Sheet, Plate, Strip)
  • ASTM A705 (Forgings)
  • Common Trade Names:


  • PH13-8Mo
  • XM-13
  • UNS S13800
  • DMS 2100 Grade
  • HMS 6-1105 REV A AMD 3
  • ST0160LB0013 REV E
  • ASTM F899-12B
  • RMS-150 REV N for sizes 3.625” Max
  • Common OEM Approvals:


  • Pratt Whitney LCS
  • Honeywell
  • GE S-400, S-1000
  • Bombardier approval to AMS 5629 including aging to H1000
  • Gulfstream
  • Stocked Sizes:


  • Rounds: 44 sizes 0.500” through 9.0” diameter
  • Flats & Blocks: 52 sizes 0.25” through 8”
    • - Custom thicknesses & widths available saw-cut or forged
  • Ingots & Billets: 3 sizes 14” through 29” for conversions

    • Note: Stocked primarily in annealed condition (solution treatment)
    • SSA routinely provides heat treated materials to all Hxxx conditions

    Chemical Composition:


    SymbolElementMin %Max %
    CCarbon0.05%
    MnManganese0.10%
    SiSilicon0.10%
    PPhosphorus0.010%
    SSulfur0.008%
    CrChromium12.25%13.25%
    NiNickel7.50%8.50%
    MoMolybdenum2.00%2.50%
    NNitrogen0.010%
    AlAluminum0.90%1.35%
    FeIronBalance

    Physical Properties:


  • Density: 0.2836 #/in3
  • Melting Range 2560° - 2680°F
  • Heat Treatment:


    ConditionTemperature
    H950950 °F ± 10 °F (510 °C ± 6 °C)
    H10001000 °F ± 10 °F (538 °C ± 6 °C)
    H10251025 °F ± 10 °F (552 °C ± 6 °C)
    H10501050 °F ± 10 °F (566 °C ± 6 °C)
    H11001100 °F ± 10 °F (593 °C ± 6 °C)
    H11501150 °F ± 10 °F (621 °C ± 6 °C)

    Mechanical Properties:


    ConditionTensile Yield 0.2% offsetElongation (%in 2") Reduction of AreaBrinell Hardness Rockwell Hardness
    Ann175 ksi max363 max
    H950220 ksi205 ksi10%45%C45 min
    H1000205 ksi190 ksi10%50%C45 min
    H1025185 ksi175 ksi11%50%
    H1050175 ksi165 ksi12%50%C40 min
    H1100150 ksi135 ksi14%50%C34 min
    H1150135 ksi90 ksi14%50%C30 min