| 摘要 |
<p>Fe/Cr/C type, said steel being characterized by the presence of a small but effective amount of each of Cu and Ni sufficient to enhance the mechanical stability of retained austenite formed following quenching of said steel from its austenitizing temperature, and also including small but effective amounts of Al, Ti and Nb sufficient to provide a fine grained microstructure. The steel consists essentially of about 0.05 to 0.5% C, about 0.1 to 0.5% Si, about 0.5 to 2% Mn, about 0.5 to 4% Cr, about 0.1 to 2% Cu, about 0.1 to 3% Ni, about 0.01 to 0.05% Al, up to about 0.02% Ti, about 0.005 to 0.04% Nb and the balance essentially iron together with minor amounts of impurities, such as P, S, and N in amounts not exceeding about 0.02% P, about 0.015% S, and about 150 ppm N. The steel has an average grain size of less than 100 microns. <IMAGE></p> |
