4340 MOD LOW ALLOY STEEL (300M)

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  • Description

    300M is a high strength, low alloy steel grade that is produced via a consumable electrode vacuum remelt. This alloy is similar to 4340 with the addition of vanadium and a higher silicon content. It offers a combination of toughness and ductility at high strength levels without increased carbon content.

  • Identification | Specifications

    UNS # K44220
    Trade Name:
    4340 Mod/300M

    AMS 6417
    AMS 6419
    BMS 7-26R Type1
    AMS 2300 AMS 6257

  • Properties

    Physical
    Specific Gravity - 7.80
    Density - 0.283 lb/in3

    Mechanical
    Hardness Rockwell C - Max 33

  • Processes

    Standard
    Hot Rolled
    Annealed
    Flattened
    Cut Ends

    Additional
    Shotblast Surface

  • Chemistry

    Aluminum .18 % Max

    Carbon 0.40 – 0.43%

    Copper 0.35 % Max

    Chromium 0.70 –0.95%

    Manganese 0.65 – 0.90%

    Molybdenum 0.35 – 0.45%

    Nickel 1.65 – 2.00%

    Phosphorus 0.010 % Max

    Silicon 1.50 – 1.80%

    Sulfur 0.008 % Max

    Tin 0.020 % Max

    Titanium 0.010 % Max

    Vanadium 0.05 – 0.10%