4340 & E4340 ALLOY STEEL

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  • Description

    4340 is a nickel-chromium-molybdenum alloy steel known for its toughness and its ability to attain high strengths in the heat-treated condition. It has very good fatigue resistance.

  • Identification | Specifications

    UNS # G43400
    AISI # 4340

    AMS 6359

  • Properties

    Physical
    Specific Gravity - 7.80
    Density - 0.283 lb/in3

  • Processes

    Standard
    Hot Rolled
    Annealed
    Flattened
    Cut Ends

    Additional
    Shotblast Surface

  • Chemistry

    Aluminum 0.15 – 0.35%

    Carbon 0.38 – 0.43%

    Copper 0.35 % Max

    Chromium 0.70 –0.90 %

    Manganese 0.65 – 0.85%

    Molybdenum 0.20 – 0.30%

    Nickel 1.65 – 2.0 %

    Phosphorus 0.015% Max

    Silicon 0.15 – 0.35%

    Sulfur 0.025 % Max