Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1991-10-02
1992-09-08
Wyszomierski, George
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148113, 73104, C21D 812
Patent
active
051455331
ABSTRACT:
A process for producing a grain-oriented electrical steel sheet having an excellent magnetic characteristic, comprising the steps of: heating to a temperature lower than 1280.degree. C. a steel slab comprising 0.025 to 0.075 wt % C, 2.5 to 4.5 wt % Si, 0.010 to 0.060 wt % acid-soluble Al, 0.0030 to 0.0130 wt % N, 0.014 wt % or less (S+0.405 Se), 0.05 to 0.8 wt % Mn, and the balance consisting of Fe and unavoidable impurities; hot-rolling the thus heated slab to form a hot-rolled strip; cold-rolling the hot-rolled strip to form a cold-rolled strip; decarburization-annealing the cold-rolled strip; applying an annealing separator on the strip; final-annealing the strip; measuring a primary-recrystallized grain size in the stage after completion of a primary recrystallization during the decarburization annealing and before completion of a secondary recrystallization during the final annealing; and controlling in that stage the subsequent grain growth of primary-recrystallized grains by an absorption of nitrogen into the steel strip in accordance with the measured grain size.
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Nakayama Tadashi
Suga Yozo
Takahashi Nobuyuki
Ushigami Yoshiyuki
Yoshitomi Yasunari
Nippon Steel Corporation
Wyszomierski George
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