METHOD FOR MANUFACTURING HOT ROLLED STEEL SHEET AND HOT ROLLED STEEL SHEET THEREOF
Disclosed are a method for manufacturing a hot-rolled steel sheet having excellent shear properties and a hot-rolled steel sheet manufactured by the method. The hot-rolled steel sheet manufacturing method in a specific example includes a step of reheating a steel slab containing 0.07 to 0.11 wt% of...
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Zusammenfassung: | Disclosed are a method for manufacturing a hot-rolled steel sheet having excellent shear properties and a hot-rolled steel sheet manufactured by the method. The hot-rolled steel sheet manufacturing method in a specific example includes a step of reheating a steel slab containing 0.07 to 0.11 wt% of carbon (C), 0.4 to 0.6 wt% of silicon (Si), 1.5 to 2.3 wt% of manganese (Mn), more than 0 to 0.05 wt% of phosphorus (P), more than 0 to 0.008 wt% of sulfur (S), 0.5 to 1.0 wt% of chromium (Cr), 0.02 to 0.08 wt% of niobium (Nb), 0.05 to 0.10 wt% of titanium (Ti), 0 to 0.005 wt% of boron (B), remaining iron (Fe), and unavoidable impurities; a step of manufacturing a hot-rolled steel sheet by hot-rolling the reheated steel slab; and a step of cooling the hot-rolled steel sheet to a winding temperature of 420 to 500°C and winding the steel sheet.
전단 특성이 우수한 열연강판 제조방법 및 이에 의해 제조된 열연강판에 관한 발명이 개시된다. 한 구체예에서 상기 열연강판 제조방법은 탄소(C): 0.07~0.11 중량%, 실리콘(Si): 0.4~0.6 중량%, 망간(Mn): 1.5~2.3 중량%, 인(P): 0 초과 0.05 중량% 이하, 황(S): 0 초과 0.008 중량% 이하, 크롬(Cr): 0.5~1.0 중량%, 니오븀(Nb): 0.02~0.08 중량%, 티타늄(Ti): 0.05~0.10 중량%, 보론(B): 0 초과 0.005 중량% 이하 및 잔량의 철(Fe) 및 기타 불가피한 불순물을 포함하는 강 슬라브를 재가열하는 단계; 상기 재가열된 강 슬라브를 열간 압연하여 열연 판재를 제조하는 단계; 및 상기 열연 판재를 권취온도: 420~500℃의 온도까지 냉각하여 권취하는 단계;를 포함한다. |
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