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    STP903

    Production of a 304 Stainless Steel Nuclear Reactor Forging from a Very Large Electroslag Refined Ingot

    Published: 01 January 1986


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    Abstract

    A four-loop, upper barrel flange forging for a nuclear reactor was produced from what the authors believe to be the largest 304H grade stainless steel electroslag refined (ESR) ingot ever refined. The ingot was refined in a 1524-mm-diameter, ingot withdrawaltype ESR furnace using a lime-bearing slag, low-frequency a-c power, and dry air protection. Five electrodes were remelted in order to produce the desired ingot weight. The ingot was subsequently forged in a five-step operation on a 6800-metric-ton press to produce the desired barrel flange configuration. Testing of the finished machined forging revealed excellent tensile ductility, excellent ultrasonic penetrability, and good chemical uniformity with no macrosegregation. Overall quality was judged to be superior to previously produced, conventionally melted forgings.

    Keywords:

    barrel flange forging, nuclear reactor, 304H stainless steel, ESR ingot, slag, ingot withdrawal furnace, tensile properties, ultrasonic penetrability, chemical uniformity, macrosegregation


    Author Information:

    Watkins, EJ
    Melting metallurgist, and general foreman, Electroslag Remelting, Bethlehem Steel Corp., Bethlehem, PA

    Tihansky, EL
    Melting metallurgist, and general foreman, Electroslag Remelting, Bethlehem Steel Corp., Bethlehem, PA


    Committee/Subcommittee: A01.06

    DOI: 10.1520/STP17373S