Steel Alloy MP-159

  • Steel Alloy MP-159

  • General Characteristics

    MP159 is an alloy of the Multiphase family of alloys possessing the unique combination of ultra-high strength, ductility and corrosion resistance. Excellent strength and ductility are also evident at elevated temperatures up to 1100 – 1200 °F. Additionally, the alloy displays exceptional corrosion resistance and resistance to crevice and stress corrosion in various hostile environments. MP159 alloy is produced by vacuum induction melting followed by VAC-ARC remelting (VIM-VAR) to provide optimum control of chemistry and preferred ingot solidification. Typical uses include: fasteners, jet-engine components, drive components, prosthetic devices, marine applications and petroleum industry applications.

  • Typical Chemical Composition

    Weight % Ni Co Cr Fe Mo Ti Cb Al
    Typical Composition 25.5 35.7 19.0 9.0 7.0 3.0 0.6 0.2

  • Physical Properties

    Characteristics English Metric
    Nominal density 77°F   /   25°C 0.301 lbs/in3 8.33 gr/cm3
    Coefficient of thermal

    expansion – Linear

    		 77°F – 212°F

    25°C – 100°C

    		 7.94 µ × in/in- °F 14.3 µ × m/m- °K
    77°F – 392°F

    25°C – 200°C

    		 7.90 µ × in/in- °F 14.2 µ × m/m- °K
    77°F – 572°F

    25°C – 300°C

    		 7.88 µ × in/in- °F 14.2 µ × m/m- °K
    77°F – 752°F

    25°C – 400°C

    		 8.09 µ × in/in- °F 14.6 µ × m/m- °K
    77°F  –  932°F

    25°C  –  500°C

    		 8.28 µ × in/in- °F 14.9 µ × m/m- °K
    77°F  – 1112°F

    25°C  –  600°C

    		 8.38 µ × in/in- °F 15.1 µ × m/m- °K
    77°F  – 1292°F

    25°C  –  700°C

    		 8.90 µ × in/in- °F 16.0 µ × m/m- °K
    77°F  – 1472°F

    25°C  –  800°C

    		 10.13 µ × in/in- °F 18.2 µ × m/m- °K
    Magnetic permeability 77°F   /   25°C 1.00265

  • Mechanical Properties

    Heat Treatment Tensile
    Ultimate Yield Elongation Reduction of

    area
    KSI MPa KSI MPa % %
    Annealed 1925°F / 1052°C, 4 hrs, WQ 123 850 58 400 60 69
    Cold Worked 48% 230 1585 205 1415 12 46
    Cold Worked 48% + 1225°F (663°C)/ 4 hrs / AC 275 1895 265 1825 8 35

  • Specifications

    • AMS – 5841, 5842, 5843
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