4340 VAR

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  • Description

    4340 steel is an ultra-high strength steel classified as a medium-carbon, low-alloy steel. 4340 steels have high strength, ductility, toughness, creep resistance, and fatigue resistance relative to most other steels. Hardness ranging from 20 to 60 HRC can be achieved, depending on the heat treatment.

  • Identification | Specifications

    GNS # G43400
    AISI # 4340

    AMS 6414
    AMS 6414
    BMS 7-28

  • Properties

    Physical
    Specific Gravity - 7.85
    Density - 0.284 lb/in³

    Mechanical
    Hardness – Rockwell C – Max 20–60

  • Processes

    Standard
    Hot Rolled
    ‍Normalized and Tempered
    Flattened
    Descaled
    Cut Ends

  • Chemistry

    Carbon 0.38% – 0.43%

    Chromium 0.70% – 0.90%

    Copper  0.35%

    Manganese 0.65% – 0.85%

    Molybdenum 0.20% – 0.30%

    Nickel  1.65% – 2.00%

    Phosphorus 0.010% Max

    Silicon  0.15% – 0.35%

    Sulfur 0.008% Max

    Vanadium 0.05% – 0.10%