CONTINUOUS CASTING METHOD 40KGF/MM2 TYPE COLD ROLLED STEEL PRODUCTS

摘要

PURPOSE: A method for manufacturing continuous casting strip for cold rolled steel sheets (40KGF/MM¬2) is provided to reduce corner crack in continuous casting strip by properly controlling the overheating degree of tundish. CONSTITUTION: The manufacturing method of continuous casting strip for cold rolled steel sheets comprises the step of tapping a molten steel in a tundish for maintaining overheating degree of the tundish between 25 and 30deg.C wherein the molten steel comprises C 0.06-0.084wt.%, Si 0.3wt.% or less, Mn 0.6-0.8wt.%, P 0.020wt.% or less, S 0.015wt.% or less, sol-Al 0.02-0.05wt.%, N 0.002-0.007wt.%, a balance of Fe, and other inevitable impurities; injecting received molten steel in a continuous casting mold.