| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing a directional electromagnetic steel sheet, by which iron loss is remarkably reduced. <P>SOLUTION: In decarburization annealing as continuous annealing in a method for producing a directional electromagnetic steel sheet, a steel slab is heated to a temperature range of 700-750°C at a rate of temperature rise of 50°C/s or more in at least 500-700°C, on the condition that an oxidizing property of the atmosphere P(H<SB POS="POST">2</SB>O)/P(H<SB POS="POST">2</SB>) is equal to 0.05 or less, and then is cooled to a temperature range of less than 700°C, on the condition that an oxidizing property of the atmosphere P(H<SB POS="POST">2</SB>O)/P(H<SB POS="POST">2</SB>) is equal to 0.05 or less, and further is reheated to a temperature range of 800-900°C, on the condition that an oxidizing property of the atmosphere P(H<SB POS="POST">2</SB>O)/P(H<SB POS="POST">2</SB>) is equal to 0.3 or more, and then is maintained in this temperature range. <P>COPYRIGHT: (C)2012,JPO&INPIT |
