Stainless Steel Alloy 13-8Mo

  • Stainless Steel Alloy 13-8Mo

  • General Characteristics

    13-8Mo is a precipitation hardening martensitic stainless-steel offering excellent fracture toughness and transverse mechanical properties coupled resistance to stress-corrosion cracking. It exhibits high strength characteristics common to the family of precipitation hardening steels. A wide range of mechanical properties can be realized by selecting various single cycle low temperature aging treatments.

    Typical applications include aircraft and nuclear reactor components, fasteners, gears, valves and jet engine parts. This alloy should be considered for applications requiring a combination of stress-corrosion resistance and high strength properties.

  • Typical Chemical Composition

    Weight % C Mn Si Cr Ni P S Mo Al N Fe
    minimum — — — 12.25 7.50 — — 2.0 0.90 — Remainder
    maximum 0.05 0.20 0.10 13.25 8.50 0.01 0.008 2.5 1.35 0.01

  • Physical Properties (Annealed condition)

    Characteristics English Metric
    Nominal density

    (68°F/20°C)

    		 0.282 lbs/in3 7.80 g/cm3
    Melting range 2560°F-2625°F 1405°C-1440°C
    Specific heat

    (212 °F/100°C)

    		 0.110 BTU/lb – °F 460 J/KG- °K
    Coefficient of thermal expansion 32°F – 212°F

    0°C – 100°C

    		 5.9 micro in/in- °F 10.6 micro m/m- °K
    32°F – 600°F

    0°C – 315°C

    		 6.2 micro in/in- °F 11.2 micro m/m- °K
    32°F – 1000°F

    0°C – 538°C

    		 6.6 micro in/in- °F 11.9 micro m/m- °K
    Thermal conductivity

     

    		 100°C 8.1 BTU/ft- hr – °F 14 W/m – °K
    500°C 12.7 BTU/ft- hr – °F 22 W/m – °K
    Electrical properties Electrical resistivity 1020 nΩ ∙ m
    Magnetic parambility —

  • Mechanical Properties

    Condition Tensile Hardness Machinability Modulus
    Ultimate Yield Elongation

     

    		 Reduction in area, % HRB 100% – 1212 steel Modulus of elasticity
    KSI MPa KSI MPa % Lo Tr Min % KSIx103 GPa
    H950 220 1520 205 1410 10 45 35 45 35 – 40 28.6 197
    H1000 205 1410 190 1310 10 50 40 43 35 – 40 32.1 221
    H1050 175 1275 165 1140 12 50 45 40 35 – 40 30.7 212
    H1100 150 1030 135 930 14 50 — 34 35 – 40 28.6 197
    H1150 135 930 90 620 14 50 — 30 35 – 40 33.4 230
    H1150M 125 860 85 585 16 55 — 26 35 – 40 24.9 172

  • Specifications

    • AMS – 5629
    • ASTM – A564
    • BMS – 7-332, 7-349 (Boeing)
    • DMS – 2100 (McDonnell-Douglas)
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