The stress corrosion crack growth rate of Alloy 182 weld metal and sensitized Alloy 600 was studied under highly controlled water chemistry conditions at 288 °C. This continuing program has found that the effects of corrosion potential, water chemistry, stress intensity, cold work, etc. are more pronounced and more reproducible than suggested from literature data. Key Words: Alloy 600, Alloy 182, weld metal, stress corrosion cracking, high temperature water, crack growth rate.