A martensitic heat resisting steel having improved heat resistance, which consists by weight percentage of 0.35%.ltoreq.C.ltoreq.0.60%, 1.0%.ltoreq.Si.ltoreq.2.5%, 0.1%.ltoreq.Mn<1.5%, 7.5%.ltoreq.Cr.ltoreq.13.0%, one or both of 1.0%.ltoreq.Mo.ltoreq.3.0% and 1.0%.ltoreq.W.ltoreq.3.0% so that 1.5%.ltoreq.(Mo+0.5W).ltoreq.3.0%, optionally 0.1%.ltoreq.Nb+Ta.ltoreq.1.0%, 0.1%.ltoreq.V.ltoreq.1.0% and S.ltoreq.0.1%, and the remainder is substantially Fe.

 
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