| 摘要 |
PURPOSE:To obtain a steel sheet having magnetic properties minimal in the difference in magnetic properties between the L direction and the C direction by hot-rolling a steel in which respective contents of C, Si, Al, and Fe are specified and then subjecting the resulting steel plate to hot rolled plate annealing, to cold rolling, and to finish annealing under respectively prescribed conditions. CONSTITUTION:A steel having a composition consisting of, by weight, <=0.01% C, 1.5-4% Si, 0.1-2% Al, and the balance Fe is refined. This steel is hot-rolled, and the resulting hot rolled steel plate is subjected to hot rolled plate annealing at 1000-1200 deg.C for 30sec-5min. subsequently, the above steel plate is formed to the final sheet thickness by means of a single cold rolling under the condition of 80-90% reduction of area. Then, finish annealing is applied to the resulting cold rolled steel sheet under the conditions of 850-1000 deg.C and 15sec-2min. |
