In a heat resistant steel, containing not less than 8% of Cr, with Co, Mo, and W being simultaneously added thereto, a combination of the addition of a very small of Mg, Ba, Ca, Y, Ce, La and the like, with the addition of a minor amount of Ti and Zr, inhibits the precipitation of {HEAD ~ an intermetallic compound} substantially having {TAIL ~ a composition} of Cr40Mo20Co20W10C2 Fe, thereby ensuring high temperature creep strength 
In a heat resistant steel , containing not less than 8 % of Cr , with Co , Mo , and W being simultaneously added thereto , a combination of the addition of a very small of Mg , Ba , Ca , Y , Ce , La and the like , with the addition of a minor amount of Ti and Zr , inhibits the precipitation of { HEAD ~ an intermetallic compound } substantially having { TAIL ~ a composition } of Cr40Mo20Co20W10C2 Fe , thereby ensuring high temperature creep strength
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