| 摘要 |
The steel for super low temperature, which comprises 27-33 wt.% Mn, 3.8-7.7 wt.% Al, 0.2-0.4 wt.% C, 0.05-0.15 wt.% Nb, 0.1-0.3 wt.% Si, 0.2-0.6 wt.% Cu and the balance Fe, is manufactured by melting, forging and controlled hot rolling which consists of steps of (i) homogenous treatment for 2 hours at 1150 deg.C, (ii) intermediate rolling with 25% reduction rate at 900 deg.C and (iii) final rolling with 5-25 reduction rate at 700-850 deg.C. |
