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    The Effect of Residual Elements on the Tensile Strength of Heavy Carbon Steel Forgings, Heat Treated for Optimum Notch Toughness

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    Residual elements are shown to have influenced the tensile strength of large, heavy section carbon steel forgings that had been heat treated for optimum Charpy V notch properties. The forgings had been made to a specification based on an early revision of ASTM Specification for Forgings, Carbon Steel, for Pressure Vessel Components (A 266-84a, UNS K035 06), but with several provisions of the more modern ASTM Specification for Quenched and Tempered Vacuum-Treated Carbon and Alloy Steel Forgings for Pressure Vessels (A 508-84a, UNS K13502). While not a factor in the particular contract described, the results are also discussed in terms of the use of carbon equivalency in the composition control of forgings for weldability purposes.


    carbon steel forgings, inter-critical heat treatment, carbon equivalent, negative carbon segregation

    Author Information:

    Nisbett, EG
    Consultant, Warren, PA

    Committee/Subcommittee: A01.11

    DOI: 10.1520/STP24575S