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11. 发明授权

KR100376532B1 지연파괴저항성이우수한고강도볼트용복합조직강및그제조방법 失效
公开(公告)号：KR100376532B1
公开(公告)日：2003-05-17
申请号：KR1019980050900
申请日：1998-11-26
申请人： 주식회사 포스코
发明人： 최해창 , 최종교 , 주웅용
IPC分类号： C22C38/00 , C21D8/06
摘要： PURPOSE: A composite organized steel for bolt and a preparation method thereof are provided, which provide the bolt having high strength, high percentage of elongation and good delayed fracture resistance. CONSTITUTION: The composite composition steel for bolt comprises: (i) 0.4-0.60 wt% of carbon, 2.0-4.0 wt% of silicone, 0.2-0.8 wt% of manganese; 0.25-0.8 wt% of chromium, less than 0.01 wt% of sulfur, less than 0.01 wt% of phosphorous, 0.005-0.01 wt% of nitrogen and less than 0.005 wt% of oxygen; (ii) at least one selected from 0.05-0.2 wt% of vanadium, 0.05-0.2 wt% of niobium, 0.3-2.0 wt% of nickel, 0.001-0.003 wt% of boron, 0.01-0.5 wt% of molybdenum, 0.01-0.2 wt% of titanium, 0.01-0.5 wt% of tungsten, 0.01-0.2 wt% of copper and 0.01-0.5 wt% of cobalt; and (iii) the remained of Fe and inevitable impurities, wherein the fine composition has the composite composition of ferrite and tempered marten site and the phase proportion of the ferrite is 8-20%. The method comprises steps of: (i) controlling the phase proportion of the ferrite at 8-20% and the phase proportion of the austenite at 80-92% by heating the composite composition steel within the range of from Ac3-(Ac3-Ac1)/1.3 to Ac3-(Ac3-Ac1)/5.5 for more than 20 minutes; (ii) tempering the step (i) by quickly cooling it in a cooling rate of 70°C/second at a temperature of 300-600°C for more than 20 minutes.
摘要翻译：目的：提供一种用于螺栓的复合组织钢及其制备方法，它提供了具有高强度，高伸长率和耐延迟断裂性的螺栓。本发明的螺栓用复合组成钢含有：（i）0.4-0.60重量％的碳，2.0-4.0重量％的硅氧烷，0.2-0.8重量％的锰; 0.25-0.8重量％的铬，小于0.01重量％的硫，小于0.01重量％的磷，0.005-0.01重量％的氮和小于0.005重量％的氧; （ii）选自钒0.05-0.2重量％，铌0.05-0.2重量％，镍0.3-2.0重量％，硼0.001-0.003重量％，钼0.01-0.5重量％，钼0.01-0.5重量％ 0.2重量％的钛，0.01-0.5重量％的钨，0.01-0.2重量％的铜和0.01-0.5重量％的钴; （iii）Fe和不可避免的杂质残留，其中所述组合物具有铁素体和回火马氏体位置的复合组成，并且所述铁素体的相组成比例为8-20％。该方法包括以下步骤：（i）通过将复合组成钢加热到Ac3-（Ac3-Ac1）范围内，控制铁素体的相位比例为8-20％，奥氏体的相位比例为80-92％）/1.3至Ac3-（Ac3-Ac1）/5.5超过20分钟; （ii）通过在300-600℃的温度下以70℃/秒的冷却速度快速冷却步骤（i）超过20分钟来回火步骤（i）。

12. 发明公开

KR1020010060853A 지연파괴 균열길이 측정방법 失效
标题翻译：测量延迟断裂裂纹长度的方法
公开(公告)号：KR1020010060853A
公开(公告)日：2001-07-07
申请号：KR1019990063307
申请日：1999-12-28
申请人： 주식회사 포스코
发明人： 최종교
IPC分类号： G01N3/08
摘要： PURPOSE: A measuring method of crack length of delayed fracture is provided to measure delayed fracture length by using fine changes in electric resistance depending on crack length. CONSTITUTION: Various length of artificial cracks is formed at notch test pieces respectively. An electric current is fed lengthwise to the test pieces having the artificial cracks, and electric potential difference is measured at both ends of a notch. Correlation between the crack length and the measured electric potential difference is obtained. In actual test for measuring delayed fracture, an electric current is supplied lengthwise to the test pieces and electric potential difference is measured. The measured potential difference is input to the correlation. Therefore, the crack length is obtained. The changes in crack length are measured from outside exactly without stop after a load is added. Therefore, sensibility of delayed fracture is estimated.
摘要翻译：目的：提供延迟断裂裂纹长度的测量方法，根据裂纹长度，通过使用电阻的细微变化来测量延迟断裂长度。构成：分别在切口试验片上形成各种长度的人造裂纹。向具有人造裂纹的试件纵向地供给电流，并且在凹口的两端测量电位差。获得裂纹长度与测得的电位差之间的相关性。在测量延迟断裂的实际测试中，向测试件纵向提供电流，并测量电位差。将测量的电位差输入到相关性。因此，获得裂纹长度。在加载之后，从外部精确地测量裂纹长度的变化。因此，估计延迟性骨折的敏感性。

13. 发明授权

KR100285258B1 균질구상화용 고합금강 선재의 제조방법 失效
标题翻译：用于均匀化的高合金钢线的制造
公开(公告)号：KR100285258B1
公开(公告)日：2001-04-02
申请号：KR1019960056455
申请日：1996-11-22
申请人： 주식회사 포스코
发明人： 최종교
IPC分类号： C22C38/54
摘要： PURPOSE: A method of spheroidizing a high ally steel for wire rod is provided to rapidly obtain spheroidizing speed and uniform bainite microstructure. CONSTITUTION: The spheroidizing method of high alloy steel for wire rod includes the steps of (i) hot rolling a high alloy steel billet comprising C 0.2-0.6wt.%, Si 0.1-1.0wt.%, Mn 0.1-1.5wt.%, at least one element selected from the group consisting of Cr 0.1-2.0wt.%, Ni 0.1-5.0wt.%, Mo 0.1-1.5wt.%, B 5-200ppm, a balance of Fe and other inevitable impurities(wherein, the impurities includes Al less than 0.1wt.%, N less than 0.01wt.%, P less than 0.02wt.%, S less than 0.02wt.%); (ii) cooling the hot rolled high alloy steel wire in a cooling rate of 0.5 to 5deg.C/sec to control bainitic fraction of microstructure of the steel wire over 70%.

14. 发明公开

KR1020000042530A 고강도 고연신율 볼트의 제조방법 失效
标题翻译：用于生产具有高强度和高强度的螺栓的方法
公开(公告)号：KR1020000042530A
公开(公告)日：2000-07-15
申请号：KR1019980058750
申请日：1998-12-26
申请人： 주식회사 포스코
发明人： 최해창 , 최종교
IPC分类号： C21D9/00
摘要： PURPOSE: A method is provided to produce a bolt having high strength and high elongation by improving delayed destruction resistance with high critical delayed destruction strength, suppressing distribution of precipitation and surface decarbonization. CONSTITUTION: A steel billet is composed of 0.40 to 0.60wt% of Carbon, 2.0 to 4.0wt% of Silicon, 0.2 to 0.8wt% of Manganese, 0.2 to 0.8wt% of Chrome, less than 0.01wt% of phosphorus, less than 0.01wt% of sulfur, 0.005 to 0.01wt% of nitrogen, less than 0.005wt% of oxygen and the remain of iron and incidental impurities. Herein, the steel billet contains more than one or two components selected among a group consisting of 0.05 to 0.2wt% of vanadium, 0.005 to.02wt% of niobium, 0.3 to 2.0wt% of nickel, 0.001 to 0.003wt% of boron, 0.01 to 0.5wt% of molybdenum, 0.01 to 0.2wt% of titanium, 0.01 to 0.5wt% of tungsten, 0.01 to 0.2wt% of copper and 0.01 to 0.5wt% of cobalt. The billet is heated and rolled to be a regular shaped bolt. The bolt is heated more than for 20minutes and cooled at 70°C/sec of speed and then cooled by fluid or air to be a bolt having high strength and high elongation.
摘要翻译：目的：提供具有高强度和高伸长率的螺栓的方法，通过提高具有高临界延迟破坏强度，抑制析出分布和表面脱碳的延迟破坏性。构成：钢坯由碳粉0.40〜0.60重量％，硅2.0〜4.0重量％，锰0.2〜0.8重量％，铬0.2〜0.8重量％，磷0.01重量％以下组成 0.01重量％的硫，0.005〜0.01重量％的氮，小于0.005重量％的氧和剩余的铁和附带的杂质。这里，钢坯含有选自钒，0.005〜0.20重量％的铌，0.3〜2.0重量％的镍，0.001〜0.003重量％的硼， 0.01〜0.5重量％的钼，0.01〜0.2重量％的钛，0.01〜0.5重量％的钨，0.01〜0.2重量％的铜和0.01〜0.5重量％的钴。将坯料加热并卷成规则形状的螺栓。将螺栓加热20分钟以上，以70℃/秒的速度冷却，然后用流体或空气冷却，成为高强度，高伸长率的螺栓。

15. 发明公开

KR1020000033851A 지연파괴저항성이우수한고강도고연신율의볼트용복합조직강및그제조방법 有权
标题翻译：用于高强度和高百分比的具有良好延迟抗断裂的螺栓的复合组合物钢及其制备方法
公开(公告)号：KR1020000033851A
公开(公告)日：2000-06-15
申请号：KR1019980050899
申请日：1998-11-26
申请人： 주식회사 포스코
发明人： 최해창 , 최종교 , 박수동
IPC分类号： C22C38/00 , C21D8/06
摘要： PURPOSE: A composite composition steel for bolt and a preparation method thereof are provided which provide the bolt having high strength, high percentage of elongation and good delayed fracture resistance. CONSTITUTION: The composite composition steel for bolt comprises: (i) 0.4-0.60 wt% of carbon, 2.0-4.0 wt% of silicone, 0.2-0.8 wt% of manganese; 0.25-0.8 wt% of chromium, less than 0.01 wt% of sulfur, less than 0.01 wt% of phosphorous, 0.005-0.01 wt% of nitrogen and less than 0.005 wt% of oxygen; (ii) at least one selected from 0.05-0.2 wt% of vanadium, 0.05-0.2 wt% of niobium, 0.3-2.0 wt% of nickel, 0.001-0.003 wt% of boron, 0.01-0.5 wt% of molybdenum, 0.01-0.2 wt% of titanium, 0.01-0.5 wt% of tungsten, 0.01-0.2 wt% of copper and 0.01-0.5 wt% of cobalt; and (iii) the remained of Fe and inevitable impurities, wherein the fine composition has the composite composition of ferrite and bainite and the phase proportion of the ferrite is 5-25%. The method comprises steps of: (i) controlling the phase proportion of the ferrite at 5-25% and the phase proportion of the austenite at 75-95% by heating the composite composition steel within the range of from Ac3-(Ac3-Ac1)/1.3 to Ac3-(Ac3-Ac1)/5.5 for more than 20 minutes; (ii) quickly cooling the step (i) in a cooling rate of 70°C/second within a range of Ms+(80°C plus or minus 30°C) and then isothermal heat-treating it for more than 20 minutes; and (iii) oil cooling or air cooling the step (ii).
摘要翻译：目的：提供一种用于螺栓的复合组合物钢及其制备方法，其提供具有高强度，高伸长率和良好的延迟抗断裂性的螺栓。构成：用于螺栓的复合组合物钢包括：（i）0.4-0.60重量％的碳，2.0-4.0重量％的硅氧烷，0.2-0.8重量％的锰; 0.25-0.8重量％的铬，小于0.01重量％的硫，小于0.01重量％的磷，0.005-0.01重量％的氮和小于0.005重量％的氧; （ii）选自0.05-0.2重量％的钒，0.05-0.2重量％的铌，0.3-2.0重量％的镍，0.001-0.003重量％的硼，0.01-0.5重量％的钼，0.01- 0.2重量％的钛，0.01-0.5重量％的钨，0.01-0.2重量％的铜和0.01-0.5重量％的钴; 和（iii）剩余的Fe和不可避免的杂质，其中精细组合物具有铁素体和贝氏体的复合组成，铁素体的相比例为5-25％。该方法包括以下步骤：（i）通过将复合组合物钢加热至Ac3-（Ac3-Ac1）范围内，控制铁素体的相比例为5-25％，奥氏体的相比例为75-95％）/1.3至Ac3-（Ac3-Ac1）/5.5超过20分钟; （ii）在Ms +（80℃±30℃）的范围内以70℃/秒的冷却速度快速冷却工序（i），然后等温热处理20分钟以上; 和（iii）对所述步骤（ii）进行油冷却或空气冷却。

16. 发明公开

KR1019980044180A 선재 송풍냉각시 선재의 온도변화 예측방법 无效
标题翻译：线材冷却过程中线材温度变化的预测方法
公开(公告)号：KR1019980044180A
公开(公告)日：1998-09-05
申请号：KR1019960062225
申请日：1996-12-06
申请人： 주식회사 포스코
发明人： 최종교
IPC分类号： B21B37/00
摘要： 본 발명은 압연선재를 송풍공기를 이용하여 냉각할 때 시간에 따른 소재온도 변화를 예측하는 방법에 관한 것으로서, 선재의 열간압연후 미세하고 균일한 페라이트와 펄라이트로 이루어진 조직을 얻기 위해 강제 송풍냉각장치를 이용해 제어냉각하는 경우, 송풍공기에 의한 선재의 온도변화를 보다 정확하게 예측하는 방법을 제공하고자 하는데 그 목적이 있다.
본 발명은 하기식(1)의 열확산 방정식을 이용하여,
[수학식 1]

[여기서, T는 어떤 시간, t에서 소재의 반경방향의 위치, r인 지점에서의 온도, k는 열전도도, ρ는 밀도, Cp는 비열, 그리고 S는 소재내부에 열원(heat source)에 의한 단위시간의 발열량을 나타냄]
선재의 송풍냉각시 시간에 따른 선재의 온도변화를 예측하는 방법에 있어서, 복사열전달계수(hr)에 하기식(1aa)를 이용하여,
[수학식 1aa]

[여기서, ε은 방사율, σ는 스테펜호프만 상수, T
1 은 선재표면온도, T
0 는 외부분위기 온도, 그리고 F
10 은 선재표면에서 외부분위기로 복사될 때의 형상인자를 나타냄]
구해지는 선재 송풍냉각시 선재의 온도변화 예측방법을 그 요지로 한다.

17. 发明公开

KR1019950003465A 고인성 스프링 용강 无效
标题翻译：高韧性弹簧钢
公开(公告)号：KR1019950003465A
公开(公告)日：1995-02-16
申请号：KR1019930013199
申请日：1993-07-14
申请人： 주식회사 포스코 , 재단법인 포항산업과학연구원
发明人： 최해창 , 남원종 , 강신왕 , 최종교
IPC分类号： C22C38/00
摘要： 본 발명은 자동차 현가용 및 판스프링용을 사용되는 스프링용강에 관한 것으로서, 니켈을 상향조정하고 망간 및 크롬의 함량을 하향조정하여 항복강도의 저하없이 인성을 향상시킬 수 있는 고인성 스프링용강을 제공하고자 하는데, 그 목적이 있다.
본 발명은 강을 열간압연한 다음, 소입 및 소려처리하여 제조되는 스프링용강에 있어서, 중량%로, C:0.30-0.45%, Si:1.0-3.0%, Mn:0.2-0.8%, Cr:0.2-0.6%, Mo:0.05-0.5%, Ni:2.0-4.0%, V:0.05-0.5%, P:0.2% 이하, S:0.2% 이하 및 잔부 Fe 및 기타 불가피한 불순물로 조성됨을 고인성 스프링용강을 그 요지로 한다.

18. 发明公开

KR1020160006166A 향상된 내마모성 강철 및 그의 제조 방법 审中-实审
标题翻译：增强耐磨钢及其制造方法
公开(公告)号：KR1020160006166A
公开(公告)日：2016-01-18
申请号：KR1020157029306
申请日：2014-03-05
申请人： 엑손모빌 리서치 앤드 엔지니어링 컴퍼니 , 주식회사 포스코
发明人： 에이어래그하밴 , 최종교 , 진현우 , 이학철 , 뮐러러셀로베르트 , 서인식 , 마닝
IPC分类号： C21D6/00 , C21D8/00 , C21D9/08 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/38 , C21D9/44
CPC分类号： C22C38/38 , C21D6/005 , C21D8/005 , C21D9/08 , C21D9/44 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , G01N17/046
摘要： 본발명은개선된강철조성물및 이의제조방법을제공한다. 본발명은유리한내마모성강철을제공한다. 보다특히, 본발명은향상된내마모성을갖는고 망간(Mn)강, 및향상된내마모성을갖는고 망간강조성물을제조하는방법을제공한다. 본발명의유리한강철조성물/부품은하기특성들중의하나이상을개선시킨다: 내마모성, 연성, 균열저항, 침식저항, 피로수명, 표면경도, 응력부식저항, 피로저항, 및/또는환경균열저항. 일반적으로, 본발명은마모및/또는침식에저항하도록조정된고 망간강을제공한다.

19. 发明授权

KR101439629B1 내마모성이 우수한 내마모용 강재 및 그 제조방법 有权
标题翻译：具有优异耐磨性的耐磨钢及其制造方法
公开(公告)号：KR101439629B1
公开(公告)日：2014-09-11
申请号：KR1020120114367
申请日：2012-10-15
申请人： 주식회사 포스코
发明人： 장우길 , 최종교 , 조현관
IPC分类号： C22C38/04 , C21D8/00 , B21B3/00
摘要： 본 발명은 내마모성이 우수한 우수한 인성을 갖는 동시에 마모특성이 우수한 내마모용 강재와 이를 제조하는 방법에 관한 것으로,
중량%로, Mn: 2.6~4.5%, (12-Mn)/40≤C≤(15.5-Mn)/40, Si: 0.05~1.0%, 나머지는 Fe 및 불가피한 분순물을 포함하고,
미세조직이 면적분율로, 95%이상 마르텐사이트를 포함하고, 미세조직 결정립의 종횡비가 1.5 이상인 내마모성이 우수한 내마모용 강재 및 이를 제조하는 방법을 제공한다.

20. 发明授权

KR101406600B1 용접부 인성이 우수한 인장강도 1000ＭＰａ급 초고강도 강판 및 그 제조방법 有权
标题翻译：具有优异焊接区域的1000MPa级的超高强度钢板及其制造方法
公开(公告)号：KR101406600B1
公开(公告)日：2014-06-11
申请号：KR1020120050936
申请日：2012-05-14
申请人： 주식회사 포스코
发明人： 이학철 , 최종교 , 조현관 , 이홍주
IPC分类号： C22C38/00 , C21D8/02 , C22C38/04 , C21D9/46
摘要： 본 발명은 구조물 설계 등에 사용되는 초고강도 강판 및 이의 제조방법에 관한 것으로, 강재의 합금성분 및 제조조건을 정밀하게 제어함으로써 모재 및 용접부의 인성이 모두 우수한 1000MPa 급 초고강도 강판을 제조할 수 있다.

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