| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a nonoriented silicon steel sheet having high magnetic flux density and used as an iron core material for electrical equipment. SOLUTION: A slab, having a composition consisting of, by weight, >0.10-7.00% Si, 0.10-1.50% Mn, and the balance Fe with inevitable impurities, is used and hot-rolled. The resultant hot rolled plate is used in this state as a product or is cold-rolled once or cold-rolled two or more times while process- annealed between cold rolling stages, finish-annealed, and formed into a final product with or without application of insulation coating. In this method of manufacturing a nonoriented silicon steel sheet, lubricating oil, satisfying 80<=ρ<=800, is used as lubricating oil at finish hot rolling and is used for lubrication at finish hot rolling after being mixed with roll cooling water so that 0.5<=v<=10.0 is satisfied, where (ρ) is the coefficient of kinematic viscosity (cSt: centistoke) of the lubricating oil and (v) is the volume fraction (%) of the lubricating oil in the roll cooling water. |
