Low Chromium Reduced-Activation Ferritic Steels

    Published: Jan 1990

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    Steels are being developed for fusion reactor applications containing only elements that produce radioactive isotopes that decay to low levels in a reasonable time. These reduced-activation or fast induced-radioactivity decay ferritic steels are being developed to be analogous to the Cr-Mo steels presently in the fusion program, but with molybdenum replaced by tungsten. In this paper, steels with 2.25% chromium will be discussed. To determine the effect of tungsten and vanadium on these steels, heats were produced with 2% tungsten, with 0.25% vanadium, with 1% tungsten and 0.25% vanadium, and with 2% tungsten and 0.25% vanadium. Tempering and microstructural studies were made and tensile and impact tests were conducted. Preliminary results indicate developing a low chromium Cr-W steel without molybdenum or niobium should be possible. Such steels should have properties as good as or better than the three Cr‐Mo steels presently being considered as candidates for fusion reactor applications.


    reduced activation steels, chromium-molybdenum steels, chromium-tungsten steels, microstructures, tempering behavior, tensile properties, impact properties

    Author Information:

    Klueh, RL
    Research metallurgist, Oak Ridge National Laboratory, Oak Ridge, TN

    Maziasz, PJ
    Research metallurgist, Oak Ridge National Laboratory, Oak Ridge, TN

    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP24955S

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