| 摘要 |
PURPOSE:To manufacture a hot-rolled steel plate with superior processability, by rolling a steel contg. specified amounts or less of C and other alloying elements under specified conditions in the final stage of hot rolling, cooling the resulting plate at a specified cooling rate, and coiling it at a specified temp. CONSTITUTION:A steel contg. <0.1wt% C and <3wt% other alloying elements is hot-rolled. In the final stage of the hot rolling, the steel is rolled once or more at >=60% total draft within 2sec in the temp. range of 600 deg.C- (Ar3+100 deg.C). After finishing the hot rolling, the resulting plate is cooled at <=20 deg.C/sec cooling rate and coiled at 500-700 deg.C. A hot-rolled steel plate of uniform quality with high workability is obtd. The r-value of the plate is about 1 or above. |
