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1. 发明授权

KR100345721B1 내시효성 및 균일 연신특성이 우수한 열연강판의 제조방법 有权
标题翻译：一种用于制造具有优异非球面和均匀延伸性的热轧钢板的方法
公开(公告)号：KR100345721B1
公开(公告)日：2002-07-27
申请号：KR1019990063054
申请日：1999-12-27
申请人： 주식회사 포스코
发明人： 조열래 , 박철주
IPC分类号： C21D8/02
摘要： 본발명은내시효성및 균일연신특성이우수한열연강판의제조방법에관한것으로서, 본발명은저탄소성분계에극미량의보론을첨가하고열간압연후권취온도를적절히제어함으로써, 우수한내시효성과동시에균일연신특성을제공할수 있는열연강판을제조하는데, 그목적이있다. 본발명은중량%로 C: 0.02∼0.05%, Mn: 0.10∼0.30%, B: 10∼30ppm, P: 0.020% 이하, S: 0.015%이하, Al: 0.01∼0.04%, N: 40ppm 이하, 잔부 Fe 및기타불가피한불순물로조성되는강 슬라브를재가열한후 Ar변태점이상의마무리압연온도로열간압연하여 1.4~2.3mm의두께로하고, 600∼700℃의온도에서권취하는것을특징으로하는내시효성및 균일연신특성이우수한열연강판의제조방법을, 그기술적요지로한다.

2. 发明授权

KR100833078B1 내후성이 우수한 고강도 열연강판 有权
标题翻译：耐高温热轧钢板超高强度
公开(公告)号：KR100833078B1
公开(公告)日：2008-05-27
申请号：KR1020060133110
申请日：2006-12-22
申请人： 주식회사 포스코
发明人： 정기조 , 김교성 , 김재익 , 박철주 , 이재곤
IPC分类号： C22C38/00 , C21D8/02
CPC分类号： C22C38/42 , C22C38/48 , C22C38/50 , C22C38/58
摘要： A hot-rolled steel sheet having weatherability, tensile strength of 800 to 875 MPa, and yield strength of 700 to 745 MPa by adding Cu, Cr and Ni to steel is provided. A high strength hot-rolled steel sheet having excellent weatherability comprises, by weight percent, 0.05 to 0.07% of C, 2.5% or less of Mn, 0.04 to 0.06% of Nb, 0.08 to 0.10% of Ti, 0.30 to 0.60% of Cu, 0.5 to 1.0% of Cr, and 0.15 to 0.30% of Ni with the balance being Fe and other inevitable impurities, and has an acicular ferrite structure. The high strength hot-rolled steel sheet comprises 2.0 to 2.5% of Mn. The steel sheet has material characteristics of tensile strength of 800 to 875 MPa and yield strength of 700 to 745 MPa. The steel sheet has a yield ratio(yield strength/tensile strength) of at least 80%.
摘要翻译：提供耐候性，拉伸强度为800〜875MPa，通过向钢中添加Cu，Cr，Ni的屈服强度为700〜745MPa的热轧钢板。具有优异耐候性的高强度热轧钢板以C：0.05〜0.07％，Mn：2.5％以下，Nb：0.04〜0.06％，Ti：0.08〜0.10％，Ti：0.30〜0.60％ Cu，0.5〜1.0％的Cr和0.15〜0.30％的Ni，余量为Fe和其他不可避免的杂质，并且具有针状的铁素体结构。高强度热轧钢板含有2.0〜2.5％的Mn。钢板的拉伸强度为800〜875MPa，屈服强度为700〜745MPa的材料特性。钢板的屈服比（屈服强度/拉伸强度）为80％以上。

3. 发明公开

KR1020010060648A 내시효성 및 균일 연신특성이 우수한 열연강판의 제조방법 有权
标题翻译：制造具有优异均匀性和抗老化性能的热轧钢板的方法
公开(公告)号：KR1020010060648A
公开(公告)日：2001-07-07
申请号：KR1019990063054
申请日：1999-12-27
申请人： 주식회사 포스코
发明人： 조열래 , 박철주
IPC分类号： C21D8/02
摘要： PURPOSE: Provided is a method for manufacturing hot rolled steel sheets having superior uniform elongation property and aging resistance where a trace amount of boron is added to steel and temperature condition of coiling process is controlled to be suitable for manufacturing high quality hot rolled steel sheets. CONSTITUTION: The hot rolled steel sheet is manufactured by reheating a steel slab comprising C 0.02-0.05wt.%, Mn 0.10-0.30wt.%, B 10-30ppm, P 0.020wt.% or less, Al 0.01-0.04wt.%, N 40ppm or less, a balance of Fe, and other inevitable impurities; finish hot rolling the steel slab to 1.4-2.3mm at over Ar3 transformation point; and then coiling it in the temperature range of 600 to 700deg.C. The obtained steel sheet has physical properties as follows: yield strength= =45%, aging index(A.I)=
摘要翻译：目的：提供一种制造具有优异的均匀伸长性能和耐老化性的热轧钢板的方法，其中对钢加入微量的硼，并且控制卷取工艺的温度条件以适合制造高质量的热轧钢板。构成：热轧钢板是通过对含有C 0.02〜0.05重量％，Mn 0.10〜0.30重量％，B 10〜30ppm，P 0.020重量％以下，Al 0.01-0.04重量％的钢坯进行再加热而制造的。％，N为40ppm以下，余量为Fe等不可避免的杂质; 在Ar3相变点超热轧钢板1.4-2.3mm; 然后在600〜700℃的温度范围内进行卷取。所得钢板的物理性能如下：屈服强度= <22kg / mm2，拉伸强度= <34kg / mm2，伸长率> = 45％，老化指数（A.I）= <1kg / mm2。

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