METHOD OF PRODUCING COLD ROLLED STEEL STRIP AND PRODUCTION SYSTEM FOR COLD ROLLED STEEL STRIP
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United States of America Patent
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Oct 18, 2018
app pub date -
Jul 7, 2016
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Jul 7, 2016
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Abstract
A method of producing a cold rolled steel strip includes: subjecting a steel strip that has been cold rolled and subsequently continuously annealed to pickling by continuously feeding the steel strip into a mixed acid solution containing a first acid that is oxidizing and a second acid that is non-oxidizing to immerse the steel strip; and subsequently subjecting the steel strip to repickling by continuously feeding the steel strip into an acid solution containing a third acid that is non-oxidizing to immerse the steel strip. The concentration of the first acid in the mixed acid solution is lowered and the concentration of the second acid in the mixed acid solution is raised as the iron ion concentration in the mixed acid solution rises.
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