Controlled Expension Alloy 42

  • Controlled Expension Alloy 42

  • General Characteristics

    Binary nickel-iron alloy containing 42% nickel. It has a low, and nominally constant, coefficient of expansion over the range 20-300°C (85-570°F). It is used for tooling for aerospace composites, thermostat rods, for semiconductor lead frames, in thermostatic bi-metal strip, and for glass-sealing applications in microelectronic components, vacuum devices and electric lamp bulbs.

  • Typical Chemical Composition

    Weight % Ni Fe
    Typical Composition 42.00 58.00

  • Physical Properties

    Characteristics English Metric
    Nominal density 25°C   /   78°F 0.293 lbs/in3 8.11 g/cm3
    Melting point 2615 °F 1435 °C
    Coefficient of

    thermal expansion

    From 20°C to

    temperature

    		 100-300°C

    (212 -572°F)

    		 2.94 µin/in- °F 5.30 µm/m- °K
    350°C /  662°F 3.00 µin/in- °F 5.40 µm/m- °K
    400°C /  752°F 3.40 µin/in- °F 6.20 µm/m- °K
    450°C /  842°F 3.90 µin/in- °F 7.10 µm/m- °K
    500°C /  932°F 4.40 µin/in- °F 8.00 µm/m- °K
    Thermal conductivity 100-300°C

    (212-572°F)

    		 6.07 BTU/ft- hr – °F 10.5 W/m – °K
    Electrical resistivity 25°C   /   78°F 610 nΩ · m

  • Mechanical Properties (*)

    Temperature Tensile
    Ultimate Yield Elongation on

    50 mm (2”)

    		 Reduction

    of area
    °C °F KSI MPa KSI MPa % %
    20 68 71 490 36 250 43 72
    100 212 65 450 30 210 43 72
    200 392 65 450 19 130 43 72
    300 572 59 410 16 110 44 72
    400 752 54 370 13 93 44 71
    500 932 45 310 13 93 47 66
    600 1112 30 210 13 93 56 55

    (*) Hot-rolled, annealed

  • Specifications

    • ASTM – F30
    • SEW – 385
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