Steel alloy for a ferritic steel having excellent creep rupture strength and resistance to oxidation at elevated temperatures of use

摘要

The invention relates to a steel alloy for a in the case of usage temperature of ferritic steel having excellent creep rupture strength and corrosion resistance, in particular at temperatures ≦ 750°C, with the following chemical composition (in% by.-%):C ≦ 1,0%Si ≦ 1,0%Mn ≦ 1,0%P max. 0.05%S max. 0.01%2 ≦ I ≦ 12%3 ≦ Cr ≦ 16%2 ≦ Ni ≦ 10% and / or2 ≦ Co ≦ 10%with2 ≦ Ni + co ≦ 15% and0,11 x [% cr] + 2,07 x [% al] & = 0,95 x ([% ni] + [% co])N max. 0,0200%Balance iron and inevitable impurities,with optional addition of one or more elements of v, ti, ta, zr and nbwith optional addition of one or both elements of mo and wwith optional addition of one or more elements of hf, b, se, y, te, sb, la and zr in the region of a total concentration of ≦ 0,1%with the proviso that the coherent precipitations m.sub.7 c.sub.3 uniformly distributed on the basis of ..