Stress corrosion crack growth rates of alloy 690 thermally treated (TT) after one-directionally (1D) cold-rolling along the longitudinal (L) direction and three-directionally (3D) cold-rolling were successfully measured by ACPD technique in deoxygenated water with different dissolved hydrogen contents (CdH) at 340°C. The fracture mode is mainly intergranular mode in both two kinds of alloy 690TT. The crack growth rates in the T-L orientation are higher than those in the L-T orientation in 340°C deoxygenated environments. For 1D 25% alloy 690TT with T-L orientation, the measured average crack growth rate is 4.8 × 10-11 m/s in 340°C water with CdH 30 μL/g, and the measured average crack growth rate is 1.1 × 10-10 m/s in 340°C water with CdH 10 μL/g. The mechanism of crack growth is internal oxidation mechanism.
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