Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1992-10-22
1993-11-16
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148113, H01F 104
Patent
active
052619729
ABSTRACT:
The present invention discloses a process for producing a grain-oriented electrical steel strip having a high magnetic flux density. The process comprises hot-rolling a steel ingot comprising basic ingredients and, added thereto, 0.02 to 0.15% of Sn at a temperature of 1200.degree. C. or below, annealing the hot-rolled strip, cold-rolling the annealed strip with a final rolling reduction of 80% or more and subjecting the cold-rolled strip to decarburization annealing, a nitriding treatment and finish annealing, wherein the temperature, T.degree.C., of annealing of the hot-rolled strip is set so as to fall within the range 1240-2.1.times.Al.sub.R <T<1310-1.8.times.Al.sub.R (wherein Al.sub.R =acid soluble [Al]-27/14.times.[N]) and the strip is soaked for 180 sec or less, maintained at a temperature in the range of from 800.degree. to 950.degree. C. for 30 to 300 sec and then quenched.
The grain-oriented electrical steel strip thus produced is not influenced by the variation in the [Al] and [N].
According to the present invention, a grain-oriented electrical steel strip having a very high magnetic density can be stably prepared through the establishment of a proper relationship between the Al and N ingredients and conditions for annealing of a steel strip before final cold rolling and the growth of a primary recrystallized grain to optimize the annealing conditions and the practice of a nitriding treatment after decarburization annealing.
REFERENCES:
patent: 5082509 (1992-01-01), Ushigami et al.
patent: 5145533 (1992-09-01), Yoshitomi et al.
Patent Abstracts of Japan vol. 9, No. 228(C-303)(1951), Sep. 13, 1985.
Haratani Tsutomu
Kuroki Katsuro
Masui Hiroaki
Yoshitomi Yasunari
Nippon Steel Corporation
Sheehan John P.
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