The corrosion fatigue crack growth and near-threshold characteristics of a medium strengthsteel HT60 were investigated using compact tension specimens exposed to synthetic sea water.The da/dN-△AKeff relation in air can give a conservative estimation of da/dN-△K relationsin sea water. In the case of high R, however, crack growth acceleration at high △K regionsappears to be cantrolled by the stress-assisted dissolution. The crack opening stressinlensity factor Kop detected by the back-face-strain method is the result of crack surface incontact with the corrosion products and therefore an overestimated value of Kop at the cracktip is given.
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