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    • 5. 发明公开
    • 강도 및 연성이 우수한 열연강판 및 그의 제조방법
    • 具有优越的强度和强度的热轧钢板及其制造方法
    • KR1020140084932A
    • 2014-07-07
    • KR1020120154971
    • 2012-12-27
    • 주식회사 포스코
    • 신한철전영우봉원석
    • C22C38/00C21D8/02C21D9/46C22C38/38
    • C22C38/32C21D1/18C21D8/0226C21D2211/001C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/28
    • Provided are a hot rolled steel sheet with excellent strength and ductility which contains 0.15-0.55 wt% of carbon (C), 0.3-1.0 wt% of silicon (Si), 1.5 wt% or less of manganese (Mn), 0.03-0.3 wt% of chrome (Cr), 0.0008-0.0060 wt% of boron (B), 0.01-0.03 wt% of titanium (Ti), 0.02 wt% or less of phosphorous (P), 0.02 wt% or less of sulfur (S), and the remainder consisting of iron (Fe) and inevitable impurities and has a fine structure comprising a composite structure composed of retained austenite with an area fraction of 3-25 wt%, pro-eutectoid ferrite remainder, and a martensite, and a method for manufacturing the same. According to the present invention, the hot rolled steel sheet with excellent strength and ductility and the method for manufacturing the same can reduce material costs by using an inexpensive steel material and can manufacture a steel sheet with various properties and a hot rolled steel sheet with excellent strength and ductility with a tensile strength range of 900-1200 MPa even by using the conventional TRIP steel or Q&P steel.
    • 本发明提供强度和延展性优异的热轧钢板,其含有碳(C)的0.15〜0.55重量%,硅(Si):0.3〜1.0重量%,锰(Mn):1.5重量%以下,0.03〜0.3重量% 铬(Cr),0.0008-0.0060重量%的硼(B),0.01-0.03重量%的钛(Ti),0.02重量%以下的磷(P),0.02重量%以下的硫(S ),其余由铁(Fe)和不可避免的杂质组成,并且具有包括由面积分数为3〜25重量%的残留奥氏体组成的复合结构的微细结构,共析铁素体剩余物和马氏体,以及 制造方法 根据本发明,具有优异的强度和延展性的热轧钢板及其制造方法可以通过使用便宜的钢材料来降低材料成本,并且可以制造具有各种性能的钢板和具有优异性能的热轧钢板 强度和延展性,拉伸强度范围为900-1200 MPa,即使使用传统的TRIP钢或Q&P钢。
    • 7. 发明公开
    • 고탄소 열연강판, 냉연강판 및 그 제조방법
    • 高碳钢冷轧钢卷及其制造方法
    • KR1020120029347A
    • 2012-03-26
    • KR1020110092783
    • 2011-09-15
    • 주식회사 포스코
    • 박경수신한철
    • C21D8/02C22C38/00B21B3/02
    • C21D8/0263C21D8/02C21D8/0226C21D9/46C21D2211/001C21D2211/009C22C38/002C22C38/02C22C38/04C22C38/06C22C38/18
    • PURPOSE: A high-carbon hot rolled steel sheet, a cold rolled steel sheet, and a manufacturing method thereof are provided to secure uniform fine pearlite in a hot-rolling process by effectively controlling heat caused by phase transformation. CONSTITUTION: A method for manufacturing a high-carbon hot rolled steel sheet comprises a step of preparing high-carbon steel, a step of heating the steel and hot-rolling the steel in the austenite region to make a steel plate, wherein the finishing temperature of hot rolling in the austenite region is equal to or higher than Ar3 transformation temperature, a step of rapidly cooling the steel plate to 520-620°C in a ROT(Run-Out Table) before the beginning of phase transformation, a step of maintaining the cooling temperature so that the phase transformation of the cooled steel plate is implemented at one of the cooling temperatures, and a step of winding the steel plate at a cooling maintenance temperature.
    • 目的:提供一种高碳热轧钢板,冷轧钢板及其制造方法,其特征在于,通过有效地控制由相变引起的热量,能够在热轧工序中确保均匀的细珠光体。 构成:制造高碳热轧钢板的方法包括制备高碳钢的步骤,加热钢和对奥氏体区域中的钢进行热轧制成钢板的步骤,其中终轧温度 在奥氏体区域中的热轧的温度等于或高于Ar 3相变温度,在相变开始前的ROT(Run-Out Table)中将钢板快速冷却至520-620℃的步骤, 保持冷却温度,使得冷却钢板的相变在一个冷却温度下进行,以及将钢板卷绕在冷却维持温度下的步骤。
    • 9. 发明公开
    • 충격인성이 우수한 고탄소 강판의 제조 방법
    • 高碳钢板在冲击韧性方面的制造方法
    • KR1020080060621A
    • 2008-07-02
    • KR1020060134946
    • 2006-12-27
    • 주식회사 포스코
    • 이창훈전재춘이규영신한철
    • C21D8/02C22C38/00
    • C22C38/32C21D8/0226C21D2211/002C22C38/02C22C38/04C22C38/06C22C38/28
    • A high carbon steel sheet having excellent impact toughness is provided to perform remelting of cementite completely even in a short quenching heat treatment process, and a manufacturing method of the high carbon steel sheet is provided. A manufacturing method of a high carbon steel sheet having improved impact toughness comprises the steps of: manufacturing a steel slab comprising, by weight percent, 0.2 to 0.5% of C, 0.1 to 1.2% of Mn, 0.4% or less of Si, 0.5% or less of Cr,0.01 to 0.1% of Al, 0.012% or less of S, 0.5x48/14x[N] to 0.03% of Ti, 0.0005 to 0.0080% of B, and 0.006% of N with the balance of Fe and other inevitable impurities, or manufacturing a steel slab comprising, by weight percent, 0.2 to 0.5% of C, 0.1 to 1.2% of Mn, 0.4% or less of Si, 0.5% or less of Cr,0.01 to 0.1% of Al, 0.012% or less of S, less than 0.5x48/14x[N]% of Ti, 0.0005 to 0.0080% of B, and 0.006% of N, a condition of B(at.%)/N(at.%)>1 being satisfied, with the balance of Fe and other inevitable impurities; reheating the steel slab, and hot rolling the steel slab at a finishing temperature of at least an Ar3 transformation temperature to manufacture a hot rolled steel sheet; cooling the hot rolled steel sheet in a cooling rate range of 20 to 100 deg.C/sec; and coiling the cooled hot rolled steel sheet in a temperature range of Ma to 530 deg.C to manufacture a hot rolled coil, wherein the manufacturing method further comprises performing a reheat treatment process of a steel sheet having a principal phase of bainite with an average carbide size of not more than 1 mum at 900 deg.C for 10 seconds to 30 minutes, the bainite containing 5% or less of a fraction of saltpeter ferrite in which carbides are not present and 5% or less of a fraction of pearlite with a lamellar carbide structure.
    • 提供了具有优异的冲击韧性的高碳钢板,即使在短时间淬火热处理工艺中也完全完成渗碳体的再熔化,并且提供了高碳钢板的制造方法。 具有改进的冲击韧性的高碳钢板的制造方法包括以下步骤:制造钢坯,其包含以重量百分比计,C:0.2〜0.5%,Mn:0.1〜1.2%,Si:0.4%以下,0.5 ,Cr:0.01〜0.1%,S:0.012%以下,Ti:0.5×48/14×[N]〜0.03%,B:0.0005〜0.0080%,N:0.006% 或其他不可避免的杂质,或者制造钢坯,其中以重量百分数计,C:0.2〜0.5%,Mn:0.1〜1.2%,Si:0.4%以下,Cr:0.5%以下,Al:0.01〜0.1% ,0.012%以下的S,小于0.5×48/14×[N]%的Ti,0.0005〜0.0080%的B,0.006%的N,B(at。%)/ N(原子%)的条件下, > 1满足,余量为Fe等不可避免的杂质; 对钢坯进行再加热,在至少Ar 3相变温度的终轧温度下对钢坯进行热轧,制造热轧钢板; 在20〜100℃/秒的冷却速度范围内冷却热轧钢板; 并将冷却后的热轧钢板卷绕在Ma〜530℃的温度范围内以制造热轧卷材,其中,所述制造方法还包括对具有平均值的贝氏体主相的钢板进行再热处理工序 碳化物尺寸在900℃下不超过1um,持续10秒至30分钟,贝氏体含有5%或更少的不含碳化物的铁素体部分,5%以下的珠光体与 层状碳化物结构。
    • 10. 发明公开
    • 항복강도 및 냉간압연성이 우수한 고탄소 강판 및 그 제조방법
    • 高碳钢高强度及冷加工及其制造方法
    • KR1020080060619A
    • 2008-07-02
    • KR1020060134943
    • 2006-12-27
    • 주식회사 포스코
    • 신한철박기철이수희김성진
    • C22C38/00C21D8/02
    • C22C38/34C21D8/0226C21D8/0236C21D2211/002C21D2211/009C22C38/001C22C38/04C22C38/26C22C38/28
    • A high carbon steel sheet having high yield strength and high rolling workability is provided to solve a problem that cracking or fracture is generated in the steel sheet due to its deficient rolling workability during the reduction of the steel sheet when using lower bainite or tempered martensite as a matrix structure, and a manufacturing method of the high carbon steel sheet is provided. A high carbon steel sheet comprises, by weight percent, 0.75 to 0.95% of carbon(C), 1.8% or less of silicon(Si), 0.1 to 1.5% of manganese(Mn), 0.1 to 1.0% of chromium(Cr), 0.02% or less of phosphorous(P), 0.02% or less of sulfur(S), and at least one element selected from the group consisting of 0.05 to 0.25% of V, 0.05 to 0.25% of Nb, 0.05 to 0.25% of Mo, 0.05 to 0.25% of Ti, 0.05 to 0.25% of W, 0.05 to 0.25% of Cu, and 30 to 120 ppm of N with the balance of Fe and other inevitable impurities. A microstructure of the steel sheet comprises fine pearlite having an interlayer distance of not more than 0.2 mum between lamellar cementities and upper bainite having a volume fraction of at least 90%. In the microstructure of the steel sheet, a sum of volume fractions of residual austenite and martensite is not more than 5%.
    • 提供高屈服强度和高轧制加工性的高碳钢板,以解决钢板中由于钢的还原期间的轧制加工性不足而产生裂纹或断裂的问题,当使用低贝氏体或回火马氏体时 提供了高碳钢板的基体结构体和制造方法。 高碳钢板以重量百分比计含有碳(C)的0.75〜0.95%,硅(Si)1.8%以下,锰(Mn)0.1〜1.5%,铬(Cr)0.1〜1.0% ,0.02%以下的磷(P),0.02%以下的硫(S),以及选自0.05〜0.25%的V,0.05〜0.25%的Nb,0.05〜0.25% 的Mo,0.05〜0.25%的Ti,0.05〜0.25%的W,0.05〜0.25%的Cu和30〜120ppm的N,剩余的Fe和其他不可避免的杂质。 钢板的显微组织包括细小的珠光体,层间距离不大于0.2μm,层状胶结物和体积分数至少为90%的上贝氏体之间。 在钢板的微观结构中,残余奥氏体和马氏体的体积分数之和不大于5%。