Date Aug. 22, 1996A martensitic heat resistant steel is provided which has improved {TAIL ~ high temperature creep strength}, contains Co and, at a temperature of {HEAD ~ 600 DEG C.} or above, does not form an intermetallic compound substantially having a composition of Cr40Mo20Co20W10C2 Fe 
Date Aug. 22 , 1996A martensitic heat resistant steel is provided which has improved { TAIL ~ high temperature creep strength } , contains Co and , at a temperature of { HEAD ~ 600 DEG C. } or above , does not form an intermetallic compound substantially having a composition of Cr40Mo20Co20W10C2 Fe
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