Special Metal Alloy MP-159

  • Special Metal 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. Through work strengthening and aging, MP159 alloy exhibits ultimate tensile strength levels in excess of 265,000 psi while maintaining reduction of area values greater than 30%. 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 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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