STP642

    Corrosion Fatigue of Structural Steels in Seawater and for Offshore Applications

    Published: Jan 1978


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    Abstract

    The design of fixed platform structures for deeper water and more hostile environments places increased emphasis on the consideration of long-life (> 106 cycles) corrosion-fatigue behavior of low- and medium-strength structural steels in seawater. An interpretive review of available information on this technical area has been conducted, with separate consideration given to both fatigue-crack initiation and propagation. Emphasis is placed upon weldments because welded tubular joints are the areas of main concern in the fatigue evaluation of conventional offshore platform-type structures. Effects of strain range or range of stress intensity, stress ratio, cycling frequency, and type of loading spectrum are addressed. Also, environmental effects of oxygen level, temperature, pH, cathodic polarization, and high hydrostatic pressure are covered. The merits of cathodic protection in mitigating corrosion-fatigue damage are discussed in detail. Finally, results of this review are used to develop recommendations of the variables to be included in future experimental studies of long-life corrosion-fatigue resistance of such steels in seawater.

    Keywords:

    corrosion fatigue, offshore structures, carbon steels, welded joints, cathodic protection, seawater, crack initiation, crack propagation


    Author Information:

    Jaske, CE
    Senior researcher, research leader, and associate section manager, Battelle Columbus Laboratories, Columbus, Ohio

    Broek, D
    Senior researcher, research leader, and associate section manager, Battelle Columbus Laboratories, Columbus, Ohio

    Slater, JE
    Senior researcher, research leader, and associate section manager, Battelle Columbus Laboratories, Columbus, Ohio

    Anderson, WE
    Staff engineer, Battelle Pacific Northwest Laboratories, Richland, Wash


    Paper ID: STP28713S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP28713S


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