| 摘要 |
FIELD: metallurgy.SUBSTANCE: in compliance with this invention, slab contain the following components in wt %: 0.01-0.10 C, 2.5-4.5 Si, 0.02-0.12 Mn, 0.005-0.10 Al, 0.004-0.015 N, 0.005-0.06 S and/or 0.005-0.06 S. Steel sheet temperature is controlled to satisfy the equation T(t)<FDT-(FDT-700)×t/6 (where T(t) is steel sheet temperature (°C), FDT is finishing temperature of rolling (°C) and t is time interval (s) after termination of finish rolling) over the entire roll length at cooling after finish hot rolling. Besides, temperature of steel sheet roll end section making 10% of roll length is controlled to make at least 650°C in 3 seconds after termination of hot rolling.EFFECT: higher magnetic properties over the entire coil length.2 cl, 2 dwg, 2 tbl, 1 ex |
