Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1983-09-21
1986-11-18
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148308, 420117, H01F 104
Patent
active
046234071
ABSTRACT:
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.ltoreq.0.007%, Mn=0.08.about.0.45%, P=0.015.about.0.45% in a slab. The present inventive idea does away with the conventional concept of using MnS as an inhibitor. The present invention present 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 of the slag formation.
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Konno Toyohiko
Nakayama Tadashi
Suga Yozo
Nippon Steel Corporation
Sheehan John P.
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