STP626

    Product Form Variability in the Mechanical Behavior of Type 304 Stainless Steel at Room Temperature and 593°C (1100°F)

    Published: Jan 1977


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    Abstract

    Data are presented that describe the variability of 15 products of a reference heat of Type 304 stainless steel tested in the laboratory reannealed condition. Included in the data are chemistry, hardness, grain size, yield strength at room temperature, tensile curves at 593°C (1100°F), and creep-rupture curves to 1000 h at 593°C (1100°F). The standard deviation, representing the variation in the yield strength of the 15 products about the average, is near ±7.7 MPa at room temperature and ±6.3 MPa at 593°C (1100°F). The 1000-h rupture strength varies by 3.8 percent from the average and the stress to produce a minimum creep rate of 0.01 percent/h by 3.0 percent. Variation of strength in the primary creep range is also examined. The strength for a standard product, 25-mm plate, for which a large data base exists, is compared to the behavior of the other products, and it is observed that the 25-mm plate is fairly representative of the product average. Reasons for variability are examined, and it is thought that carbon content, nitrogen content, grain size, temperature control, and extensometer performance contribute to variability, and the extent depends on the type of test.

    Keywords:

    mechanical tests, creep, high temperature tests, stress strain diagrams, stainless steel, evaluation


    Author Information:

    Swindeman, RW
    Metallurgist, Metals and Ceramics Division; solid mechanist, Engineering Technology Division; and metallurgist, Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tenn.

    McAfee, WJ
    Metallurgist, Metals and Ceramics Division; solid mechanist, Engineering Technology Division; and metallurgist, Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tenn.

    Sikka, VK
    Metallurgist, Metals and Ceramics Division; solid mechanist, Engineering Technology Division; and metallurgist, Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tenn.


    Paper ID: STP27082S

    Committee/Subcommittee: E28.10

    DOI: 10.1520/STP27082S


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