CONTINUOUS CASTING METHOD OF SLAB FOR A HOT ROLLED STEEL SHEET IN ORDER TO REDUCE CRACKS

摘要

PURPOSE: A continuous casting method of slab for a hot rolled steel sheet is provided to improve the quality of products by suppressing cracks on slab at a straighten temperature section during continuous casting.;CONSTITUTION: A continuous casting method of slab for a hot rolled steel sheet comprises following steps. Steel is manufactured into a slab through a continuous casting process. The reduction of area of the slab is 50% for continuous casting. The hot rolled steel sheet comprises one or two among C 0.15~0.20%, Mn 0.5~2.0%, Si 0.01~0.5%, Nb 0.005~0.1%, Ti 0.02~0.05%, P 0.02% or less, S 0.01% or less, Al 0.02~0.04%, B 0.0010~0.0040%, Cu 0.02% or less, Ni 0.2% or less and comprises Fe and inevitable impurities.;COPYRIGHT KIPO 2011