WARM ROLLING METHOD OF STEEL STRIP

摘要

PURPOSE:To reduce the rolling load in cold rolling while economizing energy by recovering the heat retained in a hot rolled coil to be cooled for the purpose of pickling and heating the strip after the pickling to a prescribed temp. CONSTITUTION:A hot rolled coil 1 which is usually coiled at a high temp. of about 450-700 deg.C is uncoiled and is passed through a welding machine 6 or the like to a recovery device 2 for the heat retained in the strip. The strip there is cooled to the charging temp. around 80 deg.C with a salt bath or the like and is passed through a pickling tank 3. The strip is then passed through a strip temp. controller 4 and is heated up to a prescribed temp. by using the salt bath heated after use for cooling through a piping 9; thereafter, the strip is passed through a cold rolling mill 5. The strip temp. is about 50-250 deg.C and is selected so as to make the rolling load least according to the kind of the steel.