| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a steel sheet having high Si content, excellent in pickling property and having good surface property, which is obtained by suppressing the grain boundary oxidation of a steel sheet surface layer as much as possible, and to provide a useful method for producing such steel sheets having high Si content. <P>SOLUTION: The production method includes, when hot-rolling the high-Si steel sheet in which the chemical component composition is properly controlled, winding the sheet at a temperature of ≥550°C but <750°C, and thereafter cooling to ≤500°C in the atmosphere satisfying the relationship of formula (1): (0.075×T-38)×(-1.5a+3.75)<SP POS="POST">2</SP>/(2.45)<SP POS="POST">2</SP>≤10+1.92×10<SP POS="POST">6</SP>×expä-15,462/(T+273)}×(0.1566b+0.506)×60<SP POS="POST">0.5</SP>/3.6 (wherein 10≤b≤40; a is a value of ratio ([Si]/[Mn]); and T(°C) is a winding temperature). <P>COPYRIGHT: (C)2012,JPO&INPIT |
