Several commercial Cr-Mo- V steeels known to be of different susceptibilities to heat-affected zone stress -relief cracking have been compared by means of a modified rupture test, and the differences in susceptibilities demonstrated; these have been attributedprincipally to variations in vanadium content. Comparison of these data with those obtained previously for impurities shows that variations in vanadium content have a dominant effect on stress-relief cracking. The conclusions are examined against a background of experience gained within the power-generating industry.
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