Patent ID: 6890393
Filing Date: 2005-05-10
Classification: C21D,C22C

Abstract:
1. A fine-grained iron base alloy in which the ASTM grain size number is greater than or equal to 5, consisting essentially of (wt. %): 0.05<C<0.15; 7.5<Cr<15; 2<Ni<5; Co<4, Cu<1.2; Mn<5; Si<1; (Mo+W)<4; 0.01<Ti<0.75; Zr<1.6; Ta<3.2; Hf<3.2; 0.135<(1.17Ti+0.6Zr+0.31Ta+0.31Hf)<1; N<0.02; Al<0.2; Al and Si both present such that (Al+Si)>0.01; each of B, Ce, Ca, Mg, Sc, Y, La, and Be less than 0.1; P<0.1; S<0.03; each of Sn, Sb, O, Pb and other impurities less than 0.04; and the balance essentially iron.