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    • 2. 发明公开
    • 고탄소 강판 및 그 제조 방법
    • 高碳钢板及其制造方法
    • KR1020160063172A
    • 2016-06-03
    • KR1020140166862
    • 2014-11-26
    • 현대제철 주식회사
    • 정준호나만호허성열
    • C21D8/02C22C38/04
    • C21D8/02C22C38/00C22C38/04
    • 경도와연신율이우수한열연강판및 그제조방법에대하여개시한다. 본발명에따른고탄소강판제조방법은중량%로, 탄소(C):0.35~1.2%, 실리콘(Si):1.5% 이하, 망간(Mn):12.5% 이하, 인(P):0.03% 이하, 황(S):0.02% 이하, 가용성알루미늄(sol.Al):0.05% 이하, 질소(N):0.01% 이하및 나머지철(Fe)과불가피한불순물로이루어지는슬라브판재를 Arcm 이상의온도에서열간압연하는단계; 상기열간압연된판재를페라이트영역까지 1차냉각하는단계; 상기 1차냉각된판재를 5℃/sec 이하의평균냉각속도로 2~10초동안 2차냉각하는단계; 상기 2차냉각된판재를펄라이트영역까지 3차냉각하여권취하는단계; 및상기권취된판재를 Ac1 이하의온도에서구상화소둔하는단계;를포함하는것을특징으로한다.
    • 公开了一种高碳钢板及其制造方法。 制造高碳钢板的方法包括以下步骤:将碳(C)的重量%:0.35〜1.2%,硅(Si):1.5%以下,锰(Mn) ):12.5%以下,磷(P):0.03%以下,硫(S):0.02%以下,可溶性铝(溶胶A1):0.05%以下,氮(N):0.01%以下, 余量为铁(Fe)和不可避免的杂质,温度高于或等于Arcm; 首先将热轧板冷却至铁素体区域; 其次,以低于或等于5℃/秒的平均冷却速度冷却第一冷却片2至10秒; 将第二冷却片冷却至珠光体区域并使其滚动; 并且在低于或等于Ac1的温度下对轧制板进行球化退火。
    • 8. 发明公开
    • 고탄소강 및 그 제조 방법
    • 高碳钢和制造碳钢的方法
    • KR1020140118314A
    • 2014-10-08
    • KR1020130033952
    • 2013-03-28
    • 현대제철 주식회사
    • 장진영김민수정준호천부현김성주윤일성
    • C21D8/00C22C38/00B21B1/26B21B3/00
    • C21D8/0226C21D1/18C21D2211/005C21D2211/009C22C38/02C22C38/04
    • Disclosed are high carbon steel capable of improving the yield of a final product by preventing deformation and preventing an edge part from being broken by adjusting an alloy component and controlling a process condition; and a method of manufacturing the same. According to the present invention, the method of manufacturing the carbon steel comprises: (a) a step of re-heating a steel slab comprising 0.85-1.10 wt% of carbon (C), 0.05-0.35 wt% of silicon (Si), 0.10-0.50 wt% of manganese (Mn), 0.03 wt% or less of phosphorus (P), 0.03 wt% or less of sulfur (S), 0.006 wt% or less of nitrogen (N), and the remainder consisting of Fe and inevitable impurities at 1150-1250°C which is a slab reheating temperature (SRT); (b) a step of finish hot rolling the re-heated steel at 720-790°C which is a finishing delivery temperature (FDT); and (c) a step of coiling the steel by cooling the finish hot rolled steel to 600-680°C which is a coiling temperature (CT).
    • 公开了能够通过防止变形而提高成品率的高碳钢,并且通过调整合金成分并控制工艺条件来防止边缘部分破裂; 及其制造方法。 根据本发明,制造碳钢的方法包括:(a)将包含0.85-1.10重量%的碳(C),0.05-0.35重量%的硅(Si), 0.10〜0.50重量%的锰(Mn),0.03重量%以下的磷(P),0.03重量%以下的硫(S),0.006重量%以下的氮(N),余量由Fe 和1150-1250℃的不可避免的杂质,即板坯再加热温度(SRT); (b)在720-790℃(即终轧输送温度(FDT))下对再热钢进行热轧的步骤; 和(c)通过将精热轧钢冷却至作为卷取温度(CT)的600-680℃来卷取钢的步骤。
    • 9. 发明公开
    • 초고강도 냉연강판 및 그 제조 방법
    • 超高强度冷轧钢板及其制造方法
    • KR1020140055463A
    • 2014-05-09
    • KR1020120122421
    • 2012-10-31
    • 현대제철 주식회사
    • 신효동정준호
    • C21D8/02C22C38/00B21B3/00C21D9/46
    • C21D8/0236C21D1/18C21D8/0273C21D2211/008C22C38/02C22C38/06C22C38/22C22C38/28C22C38/32C22C38/38
    • Disclosed are an ultra-high strength cold-rolled steel sheet having a tensile strength of 1470 MPa or more and an elongation of 5% and a method for manufacturing the same. According to the present invention, the method for manufacturing the ultra-high strength cold-rolled steel sheet includes: a step of cold-rolling a hot-rolled steel sheet consisting of 0.15 to 0.25 wt% of carbon (C), 0.2 wt% or less of silicon (Si), 2.0 to 3.0 wt% of manganese (Mn), 0.03 wt% or less of phosphorous (P), 0.003 wt% or less of sulfur (S), 0.05 wt% or less of soluble aluminum (S_Al), 0.4 wt% or less of chrome (Cr), 0.1 wt% or less of molybdenum (Mo), 0.02 wt% or less of titanium (Ti), 0.06 wt% or less of niobium (Nb), 0.004 wt% or less of boron (B), 0.006 wt% or less of nitrogen (N), remainder iron (Fe) and inevitable impurities; a step of annealing the cold-rolled steel sheet in a single phase range of austenite by heating the cold rolled steel sheet; a step of cooling the annealed steel sheet at an average cooling speed of 20 to 50 °C/sec up to a temperature range of martensite; and a step of over-aging the primarily cooled steel sheet in the temperature range of martensite for 30 seconds or more.
    • 公开了拉伸强度为1470MPa以上,伸长率为5%的超高强度冷轧钢板及其制造方法。 根据本发明,超高强度冷轧钢板的制造方法包括:将由0.15〜0.25重量%的碳(C),0.2重量%的碳组成的热轧钢板进行冷轧的工序, 的硅(Si),2.0〜3.0重量%的锰(Mn),0.03重量%以下的磷(P),0.003重量%以下的硫(S),0.05重量%以下的可溶性铝( S-Al),0.4重量%以下的铬(Cr),0.1重量%以下的钼(Mo),0.02重量%以下的钛(Ti),0.06重量%以下的铌(Nb) 以下的硼(B),0.006重量%以下的氮(N),余量为铁(Fe)和不可避免的杂质; 通过加热冷轧钢板,在奥氏体的单相范围内对冷轧钢板进行退火的工序; 将退火后的钢板以平均冷却速度为20〜50℃/秒的速度冷却至马氏体的温度范围; 以及在马氏体的温度范围内使主要冷却的钢板过度老化30秒以上的步骤。
    • 10. 发明公开
    • 열연강판 및 그 제조 방법과, 이를 이용한 강관 제조 방법
    • 热轧钢板,制造热轧钢板的方法和使用热轧钢板制造油管国家产品的方法
    • KR1020130134331A
    • 2013-12-10
    • KR1020120057776
    • 2012-05-30
    • 현대제철 주식회사
    • 정준호이승하김성주박영국임갑수천부현
    • C21D8/02C22C38/00C21D9/46C22C38/12
    • C21D8/0226C21D1/28C21D8/0263C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12
    • Disclosed are a hot-rolled steel sheet, a manufacturing method thereof which can be normalized at low temperatures by controlling alloy elements and process conditions, and a method for manufacturing a steel pipe using the hot-rolled steel sheet. The manufacturing method of the hot-rolled steel sheet according to the present invention comprises the steps of: reheating a slab composed of 0.20-0.35 wt.% of C, 0.15-0.30 wt.% of Si, 1.2-2.0 wt.% of Mn, 0.2-0.3 wt.% of V, 0.02-0.05 wt.% of Al, 0.015 wt.% or less of P, 0.005 wt.% or less of S, 0.002 wt.% or less of Ca, 0.008 wt.% or less of N, and the rest of Fe and inevitable impurities; hot-rolling the reheated slab; and cooling the hot-rolled slab, and coiling the slab at 550-620°C, which is a coiling temperature (CT). [Reference numerals] (AA) START;(BB) END;(S110) Slab reheating (SRT : 1150-1300°C);(S120) Hot-rolling ((FDT : 840-880°C);(S130) Cooling/coiling(CT : 600-660°C)
    • 公开了一种热轧钢板,其制造方法可以通过控制合金元素和加工条件在低温下进行归一化,以及使用该热轧钢板的钢管的制造方法。 根据本发明的热轧钢板的制造方法包括以下步骤:将由0.20-0.35重量%的C,0.15-0.30重量%的Si,1.2-2.0重量%的Si, Mn,0.2-0.3重量%的V,0.02-0.05重量%的Al,0.015重量%以下的P,0.005重量%以下的S,0.002重量%以下的Ca,0.008重量% %以下的N,剩余的Fe和不可避免的杂质; 热轧再热板; 并冷却该热轧板坯,并以550-620℃(即卷取温度)卷取板坯。 (标号)(AA)START;(BB)END;(S110)板坯再加热(SRT:1150-1300℃);(S120)热轧((FDT:840-880℃));(S130)冷却 /卷取(CT:600-660℃)