| 摘要 |
PROBLEM TO BE SOLVED: To increase the magnetic flux density of a steel sheet and to reduce iron loss therein by prescribing an acid soluble Al content and an N content in a slab and coating it with a specified separation agent for annealing. SOLUTION: In the componental compsn. of a silicon steel stock as the object, 0.013 to 0.5wt.% acid soluble Al and 0.004 to 0.012% N are contained, and the ratio of Al/N is regulated to >=3.35. The acid soluble Al and N are required for forming an AlN inhibitor. In the production, after a cold rolled sheet having a final sheet thickness is obtd., decarburizing annealing and the application of a separation agent for annealing are executed, and then, finish annealing is executed. The separation agent for annealing performs important rolls of preventing fusion between steel sheets at the time of the finish annealing, controlling the behavior of the inhibitor components in the vicinity of the surface layer part of ferrite participating in the improvement of its magnetic properties in the process of the annealing and regulating the atmosphere between coil layers. For making better the effects, the separation agent for annealing in which, to 100 pts.wt. MgO, Ti compounds by 0.2 to 10 pts.wt. expressed in terms of Ti and 0.2 to 15 pts.wt. chloride are respectively added is used. |
