The effects of large additions of Sb, P, and Sn on the creep properties of cast as well as forged 1·25Cr–0·5Mo steels at 538°C were investigated. Results show that the addition of impurity elements did not modify the creep and rupture strengths or the rupture ductility of the steels. Analysis of the present results in the light of other reported results in the literature shows that a systematic investigation of several other variables, such as the alloy system, microstructure, strength level, and test temperature is needed before a unified picture can emerge concerning the role of impurities as they affect the creep properties of ferritic steels.
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