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Corrosion fatigue behaviors have been studied on low carbon steels and high tensile steels in 3%NaCl. The corrosion fatigue strength against the number of cycles was estimated by the following formula.σac=σa/(1+B·f-p·Nfp+q)where σa is the fatigue strength tested in air, f is the cyclic speed, Nf is the fatigue life to failure, and B, p, q are the material constants.It was obtained experimentally that the material constants were given as follows;(1) For a plain specimen of SM41B steel and a notched specimen of HT 80 steel, B=2.14×10-4, p=0.39, q=0.36 under plane bending corrosion fatigue tests.(2) For a plain specimens of HT 80, HY 110, and HY 130 steels, B=4.78×10-4, p=0.39, q=0.36 under plane bending corrosion fatigue tests.(3) For a plain specimen of SM41B steel, B=1.08×10-4, p=0.39, q=0.36 under tention and compression corrosion fatigue tests.(4) The material constant B is given by the following function.B=8.7×10-4logσw-1.0×10-3where σw is the fatigue limit tested in air.

On Corrosion Fatigue Strength of High Tensile Steels