Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1990-04-12
1992-01-21
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148113, H01F 104
Patent
active
050825097
ABSTRACT:
A method of producing an oriented electrical steel sheet having superior magnetic properties comprises the steps of, hot rolling a slab containing 0.8 to 6.8% of Si, 0.008% of Al acid soluble, the balance being Fe and accompanying impurities, by weight to form a strip, cold rolling the strip, primary-recrystallization annealing, coating the strip with an annealing separator, and finishing annealing, a nitriding treatment being effected after the primary recrystallization annealing but before the start of the secondary recrystallization of the finishing annealing. According to the present invention, with an atmosphere oxidizing degree (PH.sub.2 O/PH.sub.2): x in a soaking process in said primary recrystallization annealing an annealing is effected in an atmosphere which has an oxidizing degree (PH.sub.2 O/PH.sub.2): y in a range defined by the following inequality, at a temperature ranging from 650.degree. to 800.degree. C. in the heating process, for at least 5 secs. ##EQU1##
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Itoh Mikio
Konno Toyohiko
Nishiyama Toshio
Suga Yozo
Takimoto Kenichi
Nippon Steel Corporation
Sheehan John P.
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