15-5 PH STAINLESS STEEL – AMS 5659

15-5 PH stainless steel is a martensitic precipitation-hardening stainless steel with approximately 15% Chromium and 5% Nickel. It has high strength, high hardness, and excellent corrosion resistance. Strength can be further increased by a single low temperature heat treatment. Compared to 17-4 PH, it offers better transverse toughness and ductility; better mechanical properties in larger cross-sections, and better forgeability. It is readily weldable. It can be machined in any of the several Thermal Conditions available to this grade.

15-5PH Stainless Steel Round Bar
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Service Steel Aerospace is one of the largest distributors / suppliers of 15-5 PH Stainless Steel available in several forms including stainless steel round bar, flat bar, and square bar as well as stainless steel plate, sheet, block, and billet. See below for product size ranges stocked.

15-5 PH stainless steel is typically used in the following applications:


  • Aerospace structural components
  • Valves
  • Gears and Shafts
  • Oil and Gas components
  • Nuclear reactor components
  • Common Specifications: AMS 5659, AMS 5862, BMS 7-240, ASTM-A-564


  • AMS 5659 (Bar & Forgings)
  • AMS 5862 (Plate)
  • ASTM A564 (Grade XM-12)
  • ASTM A705 (Grade XM-12)
  • ASME SA564
  • Boeing BMS 7-240
  • Boeing BMS 7-351
  • SPP Canada Aircraft SPPCA-EN-SOW-0036 (Capability)
  • Liebherr LAT 1-9037
  • AMS-STD-2154 (Ultrasonic Inspection)
  • For the AMS Specifications, there are two types:


  • Type 1: VAR (Vacuum Arc Remelt)
  • Type 2: ESR (Electroslag Remelt)
  • Common Trade Names:


  • PH15-5
  • XM-12
  • UNS S15500
  • 15Cr-5Ni
  • DIN X4CrNiCuNb164
  • X5CrNiCu15-5
  • DIN 1.4540
  • DIN 1.4545
  • 15-5 Stocked Sizes at Service Steel Aerospace:


  • 15-5 ESR Plate: 20 sizes 0.188" through 4" thick
  • 15-5 ESR Rounds: 22 sizes 0.625" through 8.5" diameter
  • 15-5 VAR Block: 52 sizes 0.25" through 9.5" thick
  • 15-5 VAR Flat Bar: 86 sizes 0.25" x 1" through 5.75" x 8.125"
  • 15-5 VAR Ingots: kept in stock for conversion to special bar sizes
  • 15-5 VAR Plate: 14 sizes 0.500" through 4" thick
  • 15-5 VAR Rounds: 65 sizes 0.188" through 9.5" diameter
  • 15-5 VAR Sheet: 6 sizes 0.032" through 0.125" gauge
  • 15-5 VAR Squares: 4 sizes 1" through 2.75"
  • Chemical Composition:


    Carbon0.07 max
    Manganese1.00 max
    Phosphorus0.040 max
    Sulfur0.030 max
    Silicon1.00 max
    Chromium14.00 - 15.50
    Nickel3.50 - 5.50
    Copper2.50 - 4.50
    Columbium plus Tantalum0.15 - 0.45

    Physical Properties:


    • Density: 0.2836 #/in3

    Heat Treatment:


  • H900
  • H925
  • H1025
  • H1075
  • H1100
  • H1150
  • Double H1150
  • H1150M (Modified)
  • Mechanical Properties:


    ConditionTensile Yield 0.2% offsetElongation (%in 2") Reduction of AreaBrinell Hardness Rockwell Hardness
    Ann363 BhnC33
    H900190,000 psi170,000 psi6%15%388 BhnC40
    H1025155,000 psi145,000 psi8%27%331 BhnC35
    H1075145,000 psi125,000 psi9%28%311 BhnC32
    H1150135,000 psi105,000 psi11%30%277 BhnC28
    H1150-M115,000 psi75,000 psi14%35%255 BhnC25