Title:
NONORIENTED SILICON STEEL SHEET EXCELLENT IN MAGNETIC PROPERTY AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3421536
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a nonoriented silicon steel sheet excellent in magnetic properties, at the time of producing a high silicon steel sheet having a specified compsn., by regulating the content of S to a specified range in the process of refining molten steel and thereafter adding rare earth elements and decarburizing flux thereto.
SOLUTION: At the time of refining molten steel in the production of high silicon steel, the concn. of S is regulated to 0.002 to 0.005 wt.%, and after that, rare earth elements and decarburizing flux such as limestone are added respectively by the amounts shown by the following inequalities: 0.01<R≤0.1 (R denotes the amt. kg of rare earth elements to be added per ton of the molten steel) and 50R≤CF≤2.5+50R (CF denotes the amt. of the decarburizing flux to be added per ton of the molten steel). The nonoriented silicon steel sheet having a compsn. contg., by weight, ≤0.01% C, ≤4.5% Si, ≤2.0% Mn, 0.2 to 2.0% Al and 0.0005 to 0.01% rare earth elements, in which, as for rare earth element-contg. inclusions of 0.5 to 2 μm size in the steel, ≥20% by the ratio of the number is composed of rhombic crystals RemS2 (Rem denotes rare earth elements) and excellent in magnetic properties can be obtd.
Inventors:
Minoru Takashima
Chizuko Maeda
Yoshihiro Ozaki
Chizuko Maeda
Yoshihiro Ozaki
Application Number:
JP13576897A
Publication Date:
June 30, 2003
Filing Date:
May 12, 1997
Export Citation:
Assignee:
JFE Steel Corporation
International Classes:
C21C7/064; C22C38/00; C22C38/06; H01F1/16; (IPC1-7): C22C38/00; C21C7/064; C22C38/06; H01F1/16
Domestic Patent References:
| JP8333658A | ||||
| JP83699A |
Attorney, Agent or Firm:
Akihide Sugimura (8 outside)