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    • 84. 发明授权
    • 열연강판 및 그 제조 방법
    • 热轧钢板及其制造方法
    • KR101412388B1
    • 2014-06-26
    • KR1020110098098
    • 2011-09-28
    • 현대제철 주식회사
    • 정준호장진영김성주
    • C21D8/02C22C38/00C22C38/06C21D9/46
    • 합금 성분 조절 및 공정 조건 제어를 통하여, 인장강도(TS) : 680Mpa 이상, 연신율(EL) : 20% 이상 및 가공경화지수(n-value) : 0.21 이상을 갖는 열연강판 및 그 제조 방법에 대하여 개시한다.
      본 발명에 따른 열연강판 제조 방법은 (a) 탄소(C) : 0.42 ~ 0.48 중량%, 실리콘(Si) : 0.15 ~ 0.30 중량%, 망간(Mn) : 0.6 ~ 1.0 중량%, 가용성 알루미늄(S_Al) : 0.014 ~ 0.020 중량%, 질소(N) : 0.0050 중량% 이하 및 나머지 철(Fe)과 불가피한 불순물로 이루어지는 슬라브 판재를 재가열하는 단계; (b) 상기 재가열된 판재를 FDT(Finishing Delivery Temperature) : 840 ~ 880℃에서 마무리 열간 압연하는 단계; 및 (c) 상기 열간 압연된 판재를 냉각하여 CT(Coiling Temperature) : 600 ~ 660℃에서 권취하는 단계;를 포함하는 것을 특징으로 한다.
    • 通过合金成分的控制和工艺条件控制,拉伸强度(TS):公开了一种热轧钢板和具有0.21或更多的制造方法:680Mpa以上,延伸率(EL):在20%以上和加工硬化指数(n值) 的。
    • 85. 发明授权
    • 고강도 라인파이프용 강판 및 제조 방법
    • 用于管线的高强度钢板及其制造方法
    • KR101412438B1
    • 2014-06-25
    • KR1020120070325
    • 2012-06-28
    • 현대제철 주식회사
    • 정준호김민수박영국임갑수
    • C21D8/02C22C38/00C21D9/46B21B1/26
    • 합금 성분 조절 및 공정 조건 제어를 통하여, 탄질화물의 분율을 제어함으로써 저온의 노멀라이징 열처리 조건에서 800 ~ 900MPa의 인장강도를 확보할 수 있는 고강도 라인파이프용 강판 및 그 제조 방법에 대하여 개시한다.
      본 발명에 따른 고강도 라인파이프용 강판 제조 방법은 (a) 중량%로, 탄소(C) : 0.20 ~ 0.35%, 실리콘(Si) : 0.15 ~ 0.30%, 망간(Mn) : 1.2 ~ 2.0%, 알루미늄(Al) : 0.01 ~ 0.05%, 인(P) : 0% 초과 ~ 0.015% 이하, 황(S) : 0% 초과 ~ 0.005% 이하, 바나듐(V) : 0.15 ~ 0.25%, 질소(N) : 0.002 ~ 0.006%, 칼슘(Ca) : 0% 초과 ~ 0.002% 이하 및 나머지 철(Fe)과 불가피한 불순물로 이루어지는 슬라브 판재를 재가열하는 단계; (b) 상기 재가열된 판재를 FDT(Finishing Delivery Temperature) : 800 ~ 850℃ 조건으로 마무리 열간압연하는 단계; (c) 상기 열간압연된 판재를 CT(Coiling Temperature) : 550 ~ 620℃까지 냉각하여 권취하는 단계; 및 (d) 상기 권취된 판재를 언코일링하여 노멀라이징하는 단계;를 포함하는 것을 특징으로 한다.
    • 86. 发明公开
    • 탄소강 및 그 제조 방법
    • 碳钢和制造碳钢的方法
    • KR1020140055464A
    • 2014-05-09
    • KR1020120122423
    • 2012-10-31
    • 현대제철 주식회사
    • 정준호신효동
    • C21D8/00C22C38/00B21B3/00C21D9/46
    • C21D8/0226C21D8/0263C21D9/46C22C38/001C22C38/02C22C38/04C22C38/12
    • Disclosed are a carbon steel and a method for manufacturing the carbon steel capable of ensuring excellent mechanical property by making a process heat treatment structure when a hot-rolled coil is manufactured by controlling an alloying element and a process condition. According to the present invention, the method for manufacturing the carbon steel includes: a step (a) of reheating, at a slab reheating temperature (SRT) of 1150 to 1250°C, a steel slab which consists of 0.30 to 0.40 wt% of carbon (C), 0.15 to 0.35 wt% of silicon (Si), 0.6 to 0.8 wt% of manganese (Mn), 0.025 wt% or less of phosphorus (P), 0.005 wt% or less of sulfur (S), 0.025 to 0.040 wt% of niobium (Nb), 0.006 wt% or less of nitrogen (N), remainder iron (Fe) and inevitable impurities; a step (b) of hot-rolling the reheated steel from a single phase austenite section to a eutectoid transformation temperature section; and a step (c) of cooling the hot-rolled steel up to a coiling temperature of 550 to 600°C and winding the hot-rolled steel.
    • 本发明公开了一种碳钢和通过控制合金元素制造热轧线圈的工艺热处理结构和工艺条件来确保优异的机械性能的碳钢的方法。 根据本发明,碳钢的制造方法包括:在板坯再加热温度(SRT)1150〜1250℃下再加热的工序(a),由0.30〜0.40重量% 碳(C),硅(Si)0.15〜0.35重量%,锰(Mn)0.6〜0.8重量%,磷(P)0.025重量%以下,硫(S)0.005重量%以下,0.025 至0.040重量%的铌(Nb),0.006重量%以下的氮(N),余量为铁(Fe)和不可避免的杂质; 将再热钢从单相奥氏体部分热分解成共析转变温度段的步骤(b); 以及将该热轧钢冷却至卷取温度为550〜600℃并卷绕该热轧钢的工序(c)。
    • 87. 发明公开
    • 강판 제조 방법
    • 钢板和制造热轧钢板的方法
    • KR1020140041288A
    • 2014-04-04
    • KR1020120108422
    • 2012-09-27
    • 현대제철 주식회사
    • 정준호장진영임갑수김성주
    • C21D8/02C22C38/00B21B3/00C21D9/46
    • C21D8/0226C21D1/18C21D8/0273C21D9/46C22C38/02C22C38/04C22C38/18
    • Disclosed are a steel sheet and a manufacturing method thereof, wherein the steel sheet can be applied with rapid spheroidization through process controls such as a spheroidization heat treatment and the control of alloy elements such as Cr and Mn. The manufacturing method of the steel sheet according to the present invention comprises: a step (a) of reheating a slab sheet; a step (b) of hot-rolling the reheated sheet; a step (c) of cooling the hot-rolled sheet at a cooling speed of 100-200°C/sec, and coiling the cooled sheet; and a step (d) of applying spheroidization annealing to the cooled sheet, wherein the slab sheet comprises 0.8 to 1.3 wt% of C, 0.15 to 0.30 wt% of Si, 0.6 to 1.0 wt% of Mn, 0.2 to 1.5 wt% of Cr, at most 0.015 wt% of P, at most 0.005 wt% of S, and remnants consisting of Fe and inevitable impurities. [Reference numerals] (AA) Start; (BB) End; (S110) Reheat a slab; (S120) Hot-roll; (S130) Cool/coil; (S140) Apply spheroidization annealing
    • 公开了一种钢板及其制造方法,其中可以通过球化热处理和诸如Cr和Mn等合金元素的控制的过程控制来对钢板进行快速球化。 根据本发明的钢板的制造方法包括:对板坯进行再加热的工序(a) 热再生片材的工序(b) 以100-200℃/秒的冷却速度冷却该热轧板的工序(c),卷取冷却后的板材; 以及对所述冷却片施加球化退火的工序(d),其中,所述板坯为C:0.8〜1.3重量%,Si:0.15〜0.30重量%,Mn:0.6〜1.0重量%,Mn:0.2〜1.5重量% Cr,最多为0.015重量%的P,至多0.005重量%的S,以及由Fe和不可避免的杂质组成的残余物。 (附图标记)(AA)开始; (BB)结束; (S110)再加热板坯; (S120)热轧; (S130)冷/线圈; (S140)应用球化退火
    • 89. 发明公开
    • 고강도 라인파이프용 강판 및 제조 방법
    • 用于管线的高强度钢板及其制造方法
    • KR1020140002273A
    • 2014-01-08
    • KR1020120070325
    • 2012-06-28
    • 현대제철 주식회사
    • 정준호김민수박영국임갑수
    • C21D8/02C22C38/00C21D9/46B21B1/26
    • C21D8/0226C21D1/28C21D8/0263C21D2211/005C21D2211/009C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12
    • Disclosed are high strength steel sheets for line pipes capable of securing a tensile strength of 800 ~ 900MPa in a low-temperature normalizing heat treatment condition by controlling a fraction of carbonitrides through adjusting alloy compositions and controlling process conditions together with a manufacturing method thereof. The manufacturing method of high-strength steel sheets for line pipes according to the present invention are characterized by comprising ; (a) a reheating step of slab plate materials containing in weight %; carbon (C) : 0.20 ~ 0.35%, silicon (Si) : 0.15 ~ 0.30%, manganese (Mn) : 1.2 ~ 2.0%, aluminum (Al) : 0.01 ~ 0.05%, phosphor(P) : less than 0.015% , sulfur (S) : less than 0.005% , vanadium (V) : 0.15 ~ 0.25%, nitrogen (N) : 0.002 ~ 0.006%, calcium (Ca) : less than 0.002% in addition to a balance of iron (Fe) and unavoidable impurities; and (b) a hot rolling stage for finishing of the reheated sheet materials under a condition of FDT(Finishing Delivery Temperature) : 800 ~ 850°C; and (c) a winding step after cooling of the hot rolled sheet materials down to CT(Coiling Temperature) : 550 ~ 620°C; and (d) a step of uncoiling and normalizing the wound sheet materials. [Reference numerals] (AA) START; (BB) END; (S110) Slab reheating (SRT : 1150~ 1250°C); (S120) Hot rolling (FDT : 800~850°C); (S130) Cooling/ winding (CT : 550~620°C); (S140) Normalizing (900~950°C, 5~30 min.)
    • 公开了一种能够在低温归一化热处理条件下确保抗拉强度为800〜900MPa的线管的高强度钢板,其通过调整合金组成并控制工艺条件与其制造方法一起控制碳氮化物的分数。 本发明的管线用高强度钢板的制造方法的特征在于,包括: (a)重量百分比的板坯材料的再加热步骤; 碳(C):0.20〜0.35%,硅(Si):0.15〜0.30%,锰(Mn):1.2〜2.0%,铝(Al):0.01〜0.05%,磷(P):小于0.015% 硫(S):小于0.005%,钒(V):0.15〜0.25%,氮(N):0.002〜0.006%,钙(Ca):小于0.002% 不可避免的杂质; 和(b)在FDT(整理输送温度):800〜850℃的条件下对再热片材进行精加工的热轧阶段; 和(c)将热轧板材冷却至CT(卷取温度)后的卷绕工序:550〜620℃; 和(d)开卷和标准化卷绕的片材的步骤。 (附图标记)(AA)START; (BB)END; (S110)板坯再加热(SRT:1150〜1250℃); (S120)热轧(FDT:800〜850℃); (S130)冷却/卷绕(CT:550〜620℃); (S140)归一化(900〜950℃,5〜30分钟)