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23 March, 17:51

What are the principal alloy elements of an AISI 4340 steel? How much carbon does it have? Is it hardenable? By what techniques?

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  1. 23 March, 20:15
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    The principal elements are Iron, Nickel, Chromium

    It has 0.37% to 0.43% Carbon

    It is hardenable.

    It can be hardened by cold working, annealing, quenching.

    Explanation:

    A)

    The chemical composition of AISI 4340 Steel are as follows:

    Iron - - - 95% to 96%

    Nickel - - - 1.6% to 2.0%

    Chromium - - - 0.7% to 0.9%

    Manganese - - - 0.6% to 0.8%

    Carbon - - - 0.37% to 0.43%

    Molybdenum - - - 0.2% to 0.3%

    Silicon - - - 0.15% to 0.30%

    Sulfur - - - 0.040%

    Phosphorous - - - 0.0350%

    So, the principal alloy elements from this composition are Iron, Nickel and Chromium

    B)

    The carbon content in this alloy is 0.37% to 0.43%

    C)

    Yes, it can be hardened.

    D)

    It can be Hardened by Cold Working, Annealing or Quenching.
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