Patent ID: 8580190

Claim:
An iron-chromium-aluminum alloy having a long service life and exhibiting little change in heat resistance, comprising in % by weight: 4.9 to 5.8% Al; 16 to 24% Cr; 1.0 to 4.0% W; 0.05 to 0.7% Si; 0.001 to 0.5% Mn; Y and/or at least one of Sc, La and Ce, the total amount of Y and/or at least one of Sc, La and Ce being 0.02 to 0.1%; a Zr-containing portion consisting of Zr or Zr and at least one of Sc, La and Ce, the total amount of the Zr-containing portion being 0.02 to 0.1%; a Hf-containing portion consisting of Hf or Hf and at least one of Sc, La and Ce, the total amount of the Hf-containing portion being 0.02 to 0.1%; wherein Ti replaces a portion of at least one of Zr and Hf in the Zr-containing and Hf-containing portions in a total amount not exceeding 0.1%; 0.003 to 0.030% C; 0.002 to 0.03% N; a maximum of 0.01% S; a maximum of 0.5% Cu; the remainder being iron and usual steel production-related impurities, wherein Y, Hf, Zr, Ti and C satisfy the formula: I=−0.015+0.065*Y+0.030*Hf+0.095*Zr+0.090*Ti −0.065*C<0, where I is the inner oxidation, and the numbers preceding Y, Hf, Zr, Ti, C denote the concentration of those elements in % by weight.