| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a high magnetic flux density grain-oriented silicon steel sheet using a stock having low C regions in the surface layer parts. SOLUTION: In the method for producing a grain-oriented silicon steel shseet in which a slab contg., by weight, 0.03 to 0.10% C, 2.5 to 4.5% Si, 0.02 to 0.15% Mn, 0.01 to 0.05% S, 0.01 to 0.04% acid soluble Al and 0.003 to 0.015% N, and the balance Fe with inevitable impurities is used as the stock, which is subjected to hot rolling and precipitation annealing, is thereafter subjected to cold rolling at >=50% final cold rolling draft for one time or ∞ two times including process annealing and is moreover subjected to decarburizing annealing and finish annealing, the slab surface layer contg. 0.005% <= the internal layer C to the surface layer C <= 0.03% and contg. the other elements similarly to the above is provided on both sides by 5 to 25% per side. By providing sufficiently low C regions on both sides of the stab surface parts by 5 to 30% per side, the Goss nuclei before secondary recrystallization increase to stabilize secondary recrystallization and to improve its magnetic properties. |
