PROCESS AND DEVICE FOR PRODUCING HOT-ROLLED STRIP FROM SILICON STEEL
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United States of America Patent
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Issued Date -
Dec 6, 2012
app pub date -
Oct 12, 2009
filing date -
Oct 17, 2008
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Abandoned
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Abstract
A method and a combined casting/rolling installation for production/processing of high-quality hot-rolled strip into grain-oriented electrical steel strip at low cost, provides for: a) melting a steel having a chemical composition in wt % of Si 2 to 7%, C 0.01 to 0.1%, Mn<0.3%, Cu 0.1 to 0.7%, Sn<0.2%, S<0.05%, Al<0.09%, Cr<0.3%, N<0.02%, P<0.1%, remainder Fe and impurities; b) casting a strand having a thickness of 25 to 150 mm on a continuous casting installation; c) rolling into a strip in up to 4 rolling passes directly after casting the strand, wherein at least in one rolling pass a true strain is >30% or the total true strain of all passes is >50%; d) heating the strip to a final temperature of 1050 to 1250° C., preferably 1100 to 1180° C.; e) finish rolling the strip in a second rolling train, then f) cooling and winding the strip.
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