STP425

    Stress Corrosion Cracking of High-Strength Bolting

    Published: Jan 1967


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    Abstract

    Exposure of high-strength steel bolts (260,000 psi) to the natural environments of temperature changes, moisture, and salt air have resulted in a number of stress corrosion cracking failures. Cadmium plating of the bolts has not prevented these failures. This paper presents a study of bolts made from H-11, 4340, and maraging steel heat treated to several strength levels. The authors have adopted the 3 1/2 per cent NaCl solution, intermittent exposure test to high-strength bolting and have used it as a basis for comparison of bolt life. The influence of thread rolling sequence and applied and residual stresses, as well as electroplated and zinc primer coatings, were investigated. The results indicate that a H-11 high-strength steel bolt with threads rolled after heat treatment will fail in the shank. Cadmium plate with an undercoat of nickel increases the life by five to seven times. The comparison of steel types shows the maraging steel (300) to have the best life of the three alloys but not sufficient to overcome the environmental effects.

    Keywords:

    stress corrosion, corrosion, bolts, steels, environmental testing, salt water, cadmium, nickel, gold, plating, rolling, shot peening


    Author Information:

    Lin, C. S.
    Research metallurgist, research engineer, and managerpersonal members ASTM, Standard Pressed Steel Co., Jenkintown, Pa.

    Laurilliard, J. J.
    Research metallurgist, research engineer, and managerpersonal members ASTM, Standard Pressed Steel Co., Jenkintown, Pa.

    Hood, A. C.
    Research metallurgist, research engineer, and managerpersonal members ASTM, Standard Pressed Steel Co., Jenkintown, Pa.


    Paper ID: STP46454S

    Committee/Subcommittee: G01.05

    DOI: 10.1520/STP46454S


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