PROCESS AND DEVICE FOR PRODUCING A STEEL STRIP WITH THE PROPERTIES OF A COLD-ROLLED PRODUCT

摘要

PCT No. PCT/DE95/01347 Sec. 371 Date Apr. 21, 1997 Sec. 102(e) Date Apr. 21, 1997 PCT Filed Sep. 21, 1995 PCT Pub. No. WO96/12573 PCT Pub. Date May 2, 1996A process for producing a steel strip with properties of a cold-rolled product. The process including comprising the sequential steps of: a) producing a thin slab 30 to 100 mm thick from a steel melt by continuous casting in a continuous casting machine, and, after a cast strip emerges from a mold of the continuous casting machine, cast rolling the cast strip with a liquid core to reduce thickness of the cast strip by at least 10%; b) descaling the thin slab produced according to step a); c) hot rolling the descaled thin slab at temperatures in a range of 1150 DEG to 900 DEG C. for reducing thickness by at least 50% to produce an intermediate strip with a maximum thickness of 20 mm; d) after hot rolling, accelerated cooling of the intermediate strip to a temperature in a range of 850 DEG to 600 DEG C.; e) rolling down the cooled intermediate strip by isothermic rolling at 850 DEG to 600 DEG C. on a finishing train with at least three stands into strips with a maximum thickness of 2 mm, whereby the strip thickness is reduced by at least 25% per roll pass; and f) subsequently cooling the isothermic rolled steel strip in accelerated fashion to a temperature no greater than 100 DEG C.