Nickel Alloy Monel 400

  • Nickel Alloy Monel 400
  • General Characteristics

    Alloy 400 is MONEL nickel-copper is a solid-solution alloy that can be hardened only by cold working. It has high strength and toughness over a wide temperature range and excellent resistance to many corrosive environments. Alloy 400 is widely used in many fields, especially marine and chemical processing. Typical applications are valves and pumps; pump and propeller shafts; marine fixtures and fasteners; electrical and electronic components; springs; chemical processing equipment; gasoline and fresh water tanks; crude petroleum stills, process vessels and piping; boiler feed-water heaters and other heat exchangers; and deaerating heaters.

  • Typical Chemical Composition

    Weight % Ni (+Co) C Mn Fe S Si Cu
    Minimum 63.00 28.00
    Maximum 0.30 2.00 2.50 0.024 0.50 34.00
  • Physical Properties

    Characteristics English Metric
    Nominal density 20°C   /   68°F 0.318 lbs/in3 8.80 g/cm3
    Melting range 2370-2460 °F 1300-1350 °C
    Specific heat * 21°C   /   70°F 0.102 BTU/lb – °F 427 J/KG- °K
    Average coefficient of

    thermal expansion

    93°C    /  200°F 7.7 micro in/in- °F 14.2 micro m/m- °K
    204°C  /  400°F 8.6 micro in/in- °F 15.2 micro m/m- °K
    316°C  /  600°F 8.8 micro in/in- °F 15.7 micro m/m- °K
    427°C  /  800°F 8.9 micro in/in- °F 16.1 micro m/m- °K
    649°C  /1200°F 9.3 micro in/in- °F 16.6 micro m/m- °K
    760°C  /1400°F 9.6 micro in/in- °F 17.0 micro m/m- °K
    Thermal conductivity *

    from 20°C(68°F) to

    temperature

    93°C    /  200°F 13.9 BTU/ft- hr – °F 24.0 W/m – °K
    204°C  /  400°F 15.6 BTU/ft- hr – °F 26.9 W/m – °K
    316°C  /  600°F 17.4 BTU/ft- hr – °F 30.1 W/m – °K
    427°C  /  800°F 19.3 BTU/ft- hr – °F 33.4 W/m – °K
    649°C  /1200°F 22.8 BTU/ft- hr – °F 39.4 W/m – °K
    760°C  /1400°F 24.5 BTU/ft- hr – °F 42.4 W/m – °K
    Electrical resistivity *,** 93°C    /  200°F 537 nΩ ∙ m
    204°C  /  400°F 559 nΩ ∙ m
    316°C  /  600°F 574 nΩ ∙ m
    427°C  /  800°F 587 nΩ ∙ m
    649°C  /1200°F 620 nΩ ∙ m
    760°C  /1400°F 639 nΩ ∙ m

    (*)            These values also apply to MONEL alloy R-405, the free-machining version of MONEL alloy 400. 

    (**)           Annealed material.

  • Mechanical Properties

    Condition Tensile Hardness
    Ultimate Yield Elongation in

    50 mm (2 in.)

    Rockwell B
    KSI MPa KSI MPa %
    Cold-Drawn, Annealed 70-85 482-586 25-45 172-310 50-35 75 max
    Cold-Drawn,

    Stress-Relieved

    85-120 586-827 55-100 379-690 35-15 85-100
    Heat-Exchanger,

    Annealed

    70-85 482-586 28-45 193-310 50-35 75 max
    Heat-Exchanger,

    Stress-Relieved

    85-105 586-724 55-90 379-621 35-15 85-97
    No. 1 Temper (Annealed) 85 max 586 max 30-45 207-310 45-30 73 max
    No. 2 Temper (Half-Hard) 85-105 586-724 55-80 379-552 30-10 75-97
    No. 3 Temper (Full-Hard) 110-130 758-896 90-110 621-758 10-3 95-27 RC
  • Specifications

    • AMS – 4574
    • ASTM – B163 (Condenser and Heat Exchanger Tube), B165 (Seamless Pipe and Tube), B725 (Welded Pipe), B730 (Welded Tube) , B751 (Welded Tube), B775 (Seamless and Welded Pipe), B829 (Seamless Pipe and Tube)
    • ASME – SB163 (Condenser and Heat Exchanger Tube), SB165 (Seamless Pipe and Tube), SB725 (Welded Pipe), SB730 (Welded Tube) , SB751 (Welded Tube), SB775 (Seamless and Welded Pipe), SB829 (Seamless Pipe and Tube)

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