This paper deals with the newly developed 12 Cr heat resistant steel plate (TEMPALOY F-12M) containing 0.7Mo-1W-0.lMn-B-Cu-Nb-V-N which is used for hot reheat steam pipes and headers with large diameter and thick wall of USC boilers. The steelhas high steam oxidation resistance and creep rupture strength of more than 1.3 times higher than Modified 9Cr-1Mo steel (ASTM A387 Grade 91) above 600℃, which is attributed to the strengthening factor of lower Mn and B addition as well as precipitationstrengthening of Nb, V carbonitride and W strengthening. Furthermore, the steel plate consisting of fully tempered martensitic structure exhibits sufficient notch toughness after not only PWHT but also long term aging, and good hot and cold workabilityand weldability.
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