STEEL ALLOY FOR FERRITIC STEEL HAVING EXCELLENT CREEP STRENGTH AND OXIDATION RESISTANCE AT ELEVATED USAGE TEMPERATURES

摘要

C ≤ 1.0%; Si ≤ 1.0%; Mn ≤ 1.0%; P max. 0.05%; S max. 0.01%; 2 ≤ Al ≤ 12%; 3 ≤ Cr 16%; 2 ≤ N1 ≤ 10% and/or 2 ≤ CO ≤ 10%, where 2 ≤ N1+Co [%Cr] + 2,07x[%A1] = 0.95x([%N1] + [%Co]); N max. 0.0200%; the remainder being iron with steel production-related impurities, with the optional addition of one or more elements of V, Ti, Ta, Zr and Nb; with the optional addition of one or both elements of Mo and W; with the optional addition of one or more elements of Hf, B, Se, Y, Te, Sb, La and Zr in the range of a cumulative content of 0.1%, with the proviso that the steel structure comprises uniformly distributed coherent precipitates based on a chromium-stabilized (Ni, Co)A1-B2 intermetallic ordered phase.