Effects of dissolved oxygen concentration from 0·2 to 11 ppm on stress corrosion cracking growth rates of 316NG weld metals in pure water at 288°C were investigated. Crack growth rates in the weld metal with a ferrite content of about 6·5 wt-% are higher than those in the weld metal with a ferrite content of about 8·5 wt-% under the same test environments, which increased with increasing dissolved oxygen concentration from 0·2 to 2 ppm. The dependence of crack growth rates on dissolved oxygen concentration in the range from 2 to 11 ppm was affected by the ferrite content in the weld metals.
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