发明名称 |
METHOD FOR PRODUCING GRAIN-ORIENTED MAGNETIC STEEL SHEET HAVING GOOD BLANKING WORKABILITY WITHOUT APPLYING PRIMING COATING |
摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for stably producing a grain-oriented magnetic steel sheet by solving particularly such a problem as bending characteristics in the magnetic steel sheet without forsterite coating. <P>SOLUTION: The grain-oriented magnetic steel sheet which has no priming coating which mainly contains the forsterite (Mg<SB>2</SB>SiO<SB>4</SB>) is produced by the steps of: hot-rolling a silica-containing steel slab with sol. Al reduced to ≤100 ppm and N to ≤ 50 ppm; applying cold-rolling once or twice or more interposing an intermediate annealing; recystallizing and annealing the resultant product in the atmosphere having ≤ 40°C dew point; and performing last finish-annealing in the atmosphere having ≤ 40°C dew point. In soaking at ≥ 800°C for ≥ 20 hr during the last finish-annealing, the steel sheet is maintained under a prescribed staying time ratio in both of nitriding atmosphere and non-nitriding atmosphere. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
申请公布号 |
JP2004292833(A) |
申请公布日期 |
2004.10.21 |
申请号 |
JP20030082878 |
申请日期 |
2003.03.25 |
申请人 |
JFE STEEL KK |
发明人 |
HIRASHIMA KOICHI;HAYAKAWA YASUYUKI;IMAMURA TAKESHI |
分类号 |
C21D9/46;C22C38/00;C22C38/06;C22C38/60;H01F1/16 |
主分类号 |
C21D9/46 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|