HIGH Cr FERRITIC HEAT RESISTANCE STEEL

摘要

A Cr ferritic heat resistance steel containing 0.02 to 0.15 % of C, 0.05 to 1.5 % of Mn, 0.03 % or less of P, 0.015 % or less of S, 8 to 13 % of Cr, 1.5 to 4 % of W, 2 to 6 % of Co, 0.1 to 0.5 % of V, 0.01 to 0.15 % of Ta, 0.01 to 0.15 % of Nb, 0.001 to 0.2 % of Nd, less than 0.02 % of N, 0.0005 to 0.02 % of B, 0.001 to 0.05 % of Al, with the proviso that the contents of Nb and N satisfy the formula, which is excellent in the creep strength under a condition of a high temperature and long duration and in toughness, and can be used under an extra supercritical pressure condition of 650 DEG C or higher and 300 atm.