Ferritic heat-resistant cast steel and process for producing the same

Abstract

A ferritic heat-resistant cast steel includes C in an amount of from 0.1 to 0.4% by weight, Si in an amount of from 0.5 to 2.0% by weight, Mn in an amount of 1.0% by weight or less, S in an amount of from 0.06 to 0.20% by weight, Ni in an amount of 1.0% by weight or less, Cr in an amount of from 13 to 20% by weight, V in an amount of from 0.2 to 1.0% by weight, at least one element selected from the group consisting of Nb in an amount of from 0.1 to 0.4% by weight, Mo in an amount of from 0.1 to 2.0% by weight, and W in an amount of from 0.2 to 4.0% by weight, and the balance of Fe and inevitable impurities, the S being dispersed as sulfides in the ferritic heat-resistant cast steel. It can further include at least one element selected from the group consisting of Te in an amount of from 0.01 to 0.1% by weight and Al in an amount of from 0.01 to 0.5% by weight. It can be produced by melting and casting the alloying elements and thereafter by annealing the resulting cast product at a temperature of from 750.degree. to 1,000.degree. C.

Dependencies are inferred from the claim text.