| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing a grain-oriented silicon steel sheet excellent in the magnetic characteristic at a low cost. <P>SOLUTION: In the method for producing the grain-oriented silicon steel sheet, in which to a steel slab containing 0.01-0.08 mass% C, 2.0-4.5 mass% Si and 0.01-0.5 mass% Mn and <50 mass ppm S, Se and O, respectively, and restraining <60 mass ppm N and <100 mass ppm Sol. Al, an annealing and a rolling are applied, and after forming a cold-rolled sheet having the finish sheet thickness, a primary recrystallize-annealing is applied and an annealing parting agent is applied and a secondary recrystallize-annealing is applied, the crystal grain diameter in the steel sheet after the primary recrystallize-annealing, is made to in the range of 8-25 μm, the average temperature rising rate at 800-900°C in the temperature-rising process after the secondary recrystallize-annealing, is made to be in the range of 0.5-5°C/h, and the difference of nitrogen in the steel sheet at 900°C and 800°C in the temperature-rising process of the secondary recrystallize-annealing, is made to be in the range of -10 ppm to +25 ppm. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
