| 摘要 |
PROBLEM TO BE SOLVED: To obtain a silicon steel sheet capable of inhibiting magnetic deviation without providing a gap and reduced in residual magnetic flux density and also a silicon steel sheet having characteristic of a low iron loss or a high saturation magnetic flux density besides the above characteristics, by forming a prescribed concentration gradient of Si in a sheet-thickness direction and specifying Si concentration and Si concentration gradient, respectively. SOLUTION: This silicon steel sheet contains Si by <=7wt.% on average and has a concentration gradient of Si in a sheet-thickness direction, and a difference between the highest Si concentration and the lowest Si concentration is regulated to >=0.5wt.% or to >=5.5%. The concentration gradient of Si is actively formed in order to reduce residual magnetic flux density. Further, iron loss is reduced by satisfying the above essential required conditions. When the average Si concentration exceeds 7%, workability is deteriorated and punchability is extremely deteriorated. Saturation magnetic flux density is increased with the decrease of the amount of Si, and particularly, it is preferable to regulate the amount of Si to <=3.5% on average and an extremely high saturation magnetic flux density not lower than about 2.0T can be obtained. |
