Method of producing a cold-rolled strip with a ferritic structure
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United States of America Patent
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Issued Date -
Mar 12, 2009
app pub date -
Dec 27, 2006
filing date -
Dec 29, 2005
priority date (Note) -
Abandoned
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Abstract
A method of making a cold strip with a ferritic structure includes casting a molten steel which forms a ferritic structure on cooling into a cast strip, wherein if necessary hot-rolling the cast strip in-line, coiling the hot-rolled strip and in one or more steps cold-rolling to form the cold strip. With such a method, cold strips can be produced, in which the risk of formation of an orange peel appearance or ridging is minimized during a cold forming process. The cast strip is cooled between the casting process and the coiling process from a starting temperature not lower than 1180° C., at a cooling rate of at least 150° C. per second, to a maximum intermediate temperature of 1000° C. and is then held for at least 10 seconds at a maintenance temperature of between 900 and 1000° C.
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