STP665

    Portable Slow Strain-Rate Stress Corrosion Test Device

    Published: Jan 1979


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    Abstract

    A portable test device has been constructed for determining the stress corrosion cracking (SCC) characteristics of process environments. The device may be inserted and retrieved from laboratory, plant, and field equipment operating at pressures up to 13.8 MPa (2000 psi) and temperatures not exceeding 204°C (400°F) without shutting down the system. Specimens are loaded by the slow strain-rate method which has the advantage of producing SCC in a short period of time. The device is small enough to be inserted through a 2.54 cm (1 in.) diameter valve. A hydraulic cylinder, which requires a compressed gas supply as a power source, loads the specimens.

    Initial testing was performed using low carbon steel specimens in air at room temperature. The hydraulic method of specimen loading performed smoothly and allowed constant strain rates as low as 4 × 10-7s-1-1 to be maintained ± 5 percent at a hydraulic system pressure of 2.76 MPa (400 psi).

    Tests with AISI Type 304 stainless steel specimens in boiling (45 weight percent) magnesium chloride at 155°C (311°F) confirmed the applicability of the device for SCC studies. Indicators used include time to fracture, ultimate tensile strength, percent elongation, and visual observations for secondary cracks.

    Keywords:

    strain rate, portable tension tester, stress corrosion cracking, magnesium chloride, austenitic stainless steels, stress corrosion tester


    Author Information:

    Hauser, F
    Professor, research assistant, professor, and senior development engineer, University of California, Berkeley, Calif.

    Abbott, SR
    Professor, research assistant, professor, and senior development engineer, University of California, Berkeley, Calif.

    Cornet, I
    Professor, research assistant, professor, and senior development engineer, University of California, Berkeley, Calif.

    Treseder, RS
    Professor, research assistant, professor, and senior development engineer, University of California, Berkeley, Calif.


    Paper ID: STP38130S

    Committee/Subcommittee: G01.05

    DOI: 10.1520/STP38130S


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