An Evaluation of Accelerated Strauss Testing

    Published: Jan 1965

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    As a stainless steel producer, we are often requested by customers to perform ASTM Test Designation: A 393-55T on materials prior to shipment. This test, commonly known as the Strauss Test, is officially entitled “Conducting Acidified Copper Sulfate Test for Intergranular Attack in Austenitic Stainless Steel”. The purpose of conducting the test is to ascertain whether or not the finished product will be prone to suffer intergranular attack in service due to the presence of a chromium-rich carbide grain boundary precipitate. Stabilized and low carbon grades of austenitic stainless steels are also tested to verify the correct composition. These steels are tested in the “sensitized” condition. A sensitizing heat treatment of 1 hour at 1250 F in air followed by an air cool is suggested in A 393. All other materials are tested in the “as-received” condition. In the A 393 test the test specimen is exposed for a period of 72 hours to a boiling aqueous solution containing approximately 16 percent H2SO4 and 6 percent CuSO4 by weight. After exposure to boiling acid, the specimen is bent through 180 degrees and the surface is examined at 5X to 15X for the presence of fissures. Fissuring is an indication of intergranular attack.

    Author Information:

    Scharfstein, L. R.
    Corrosion Research, The Carpenter Steel Company, Reading, Pennsylvania

    Eisenbrown, C. M.
    Corrosion Research, The Carpenter Steel Company, Reading, Pennsylvania

    Committee/Subcommittee: A01.06

    DOI: 10.1520/STP43748S

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