Corrosion Resistance and Mechanical Properties of Low Carbon Austenitic Stainless Steels

    Published: Jan 1950

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    Sixty-nine 30-ton arc-furnace heats of low-carbon (0.030 per cent max.) 18-8,2 18-8 Cb, 18-8 Mo, and 18-8 Mo Cb were made and processed and their corrosion resistance and mechanical properties were investigated.

    All of the steels exhibited satisfactory corrosion resistance in a copper sulfate-sulfuric acid test after being sensitized 2 hr. at 1250 F. (675 C.), and all of the 18-8 and 18-8 Cb heats tested had satisfactory corrosion resistance in boiling 65 per cent nitric acid after being heated for 2 hr. at 1000 F. (538 C.), 1100 F. (593 C.), 1200 F. (649 C.), 1250 F. (675 C.), 1500 F. (815 C.), or 1625 F. (885 C.).

    After heating for 24 hr. at 1100 F. (593 C.), none of the heats of the four grades was satisfactory in boiling 65 per cent nitric acid, and none of the 18-8 Mo or 18-8 Mo Cb heats was satisfactory after sensitizing either 2 or 24 hr. at 1250 F. (675 C.).

    The room temperature tensile and elevated temperature creep strengths of these low-carbon steels were slightly lower than those of higher carbon stainless steels, and the low-temperature impact properties of the low-carbon grades were satisfactory.

    The results of corrosion tests of welded samples indicated that these low-carbon grades are satisfactory substitutes for the titanium and columbium-stabilized grades for applications, such as welding, that involve short heating times.

    Author Information:

    Buck, D C
    Carnegie-Illinois Steel Corp., Pittsburgh, Pa.

    Heger, J J
    Carnegie-Illinois Steel Corp., Pittsburgh, Pa.

    Phillips, F J
    Carnegie-Illinois Steel Corp., Pittsburgh, Pa.

    Queneau, B R
    Carnegie-Illinois Steel Corp., Chicago, Ill.

    Committee/Subcommittee: A01.13

    DOI: 10.1520/STP43966S

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