Method for producing non-oriented steel sheets
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United States of America Patent
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Jan 21, 1992
Issued Date -
N/A
app pub date -
Mar 27, 1989
filing date -
Sep 29, 1986
priority date (Note) -
Expired
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Abstract
A method for producing non-oriented electrical steel sheets comprising the steps of: making steel ingots comprising contents of: 0.01 wt % and less C, 0.003 wt % and less N, 0.1 to 1.0 wt % Mn and 1.7 wt % and less Si; Si and Al satisfying the formulas of: (Al %).ltoreq.0.69 (Si %).sup.2 -2.29 (Si %)+1.90; and (Al %).gtoreq.0.10 (Si %).sup.2 -0.35 (Si %)+0.3, providing that (Si %) represents wt % Si content, and that (Al %) represents wt % Al content; other contents being Fe and impurities inevitable; hot-rolling slabs of the steel ingots at finishing temperature of 700.degree. to 900.degree. C. into hot-rolled steel strips to coil the hot-rolled steel strips; and cold-rolling the hot-rolled steel strips into cold-rolled steel strips, followed by annealing the cold-rolled strip sheets.
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