C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
75/12, 148/8
C21D 8/12 (2006.01) C22C 38/02 (2006.01)
Patent
CA 1210670
- 38 - METHOD FOR PRODUCING A GRAIN-ORIENTED ELECTRICAL STEEL SHEET HAVING A HIGH MAGNETIC FLUX DENSITY ABSTRACT OF THE DISCLOSURE The present invention relates to a method for producing a grain-oriented electrical steel sheet. A feature of the present invention is to set S ? 0.007%, Mn = 0.08 ~ 0.45%, P = 0.015 ~ 0.45% in a slab. The present inventive idea does away with the conventional concept of using MnS as an inhibitor. The present invention prevents incomplete secondary recrystallization by the S content, which is decreased to a level as low as possible. In addition, a product having a high magnetic flux density can be successfully produced by adding appropriate amounts of Mn and P. Due to these advantages, a high Si content of a slab, which leads to a watt loss reduction, can also be employed in the present invention. In addition according to the present invention, the temperature of slab heating, which is carried out prior to hot rolling, can be drastically decreased as compared with the prior art. Thus, an outstanding cost reduction can be realized due to the decrease in heat energy and complete prevention - 39 - of the slag formation. Furthermore, the watt loss of a product produced by a low-temperature slab-heating is considerably lower than a product produced by a high- -temperature slab-heating.
437373
Honma Keiji
Konno Toyohiko
Matsumoto Fumio
Nakayama Tadashi
Suga Yozo
Goudreau Gage Dubuc
Nippon Steel Corporation
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