| 摘要 |
<p>A ferritic heat-resistant steel having an excellent HAZ softening resistance and exhibiting a high creep strength at a temperature as high as 500 °C or above. The steel contains on a mass basis 0.01-0.30 % C, 0.02-0.80 % Si, 0.20-1.50 % Mn, 0.50-5.00 % Cr, 0.01-1.50 % Mo, 0.01-3.50 % W, 0.02-1.00 % V, 0.01-0.50 % Nb, 0.001-0.06 % N, and at least either 0.001-0.8 % Ti or 0.001-0.8 % Zr, and the content of Ti and Zr in the M23C6 type carbides is 5-65 % of the total content of Cr, Fe, Ti and Zr.</p> |
