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    Tensile and Impact Properties of Cast Stainless Steels at Cryogenic Temperatures

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    Tensile and notched-bar impact tests were performed on production heats of seven grades of cast chromium-nickel stainless steels at temperatures from 70 F to −430 F. No ductile-brittle transition was observed for any of the alloys including those having a small amount of delta ferrite dispersed in the microstructure. Retention of toughness at low temperature was dependent upon an austenitic structure and low interstitial (carbon + nitrogen) content. Markedly higher tensile strength at the lower temperatures was contingent upon the formation of martensitic ferrite in the MdMs temperature range. The presence of martensitic ferrite was indicated by stress-strain behavior, magnetic permeability, and microstructural features.

    Author Information:

    Hall, E. R.
    Metallurgist, Esco Corp., Portland, Ore

    Committee/Subcommittee: A01.19

    DOI: 10.1520/STP49621S