The effect of ageing time at the recommended ageing temperature (510°c) on the stress corrosion resistance of a forged AF 1410 steel bar has been determined in 3·5% NaCl solution and in an H2S gas environment. Increasing the ageing time from 1 h (maximum hardness) to either 5 h or 9 h increased the KISCCfrom ∼11·75 MPa√m to ∼20 MPa√m and reduced the Stage II crack growth rate. The 5 h ageing time gave the longest lives during the stress corrosion tests; this is attributed to the observation that no Stage III rapid crack growth occurred for this ageing treatment. Accelerated tests in H2S gas gave threshold stress intensity factors (KIH2S similar to KISCC values in 3·5% NaCl
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