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    • 32. 发明授权
    • 연화열처리생략형합금강선재의제조방법
    • 磨削退火合金钢丝的制造方法
    • KR100325713B1
    • 2002-06-28
    • KR1019970073717
    • 1997-12-24
    • 주식회사 포스코
    • 최종교
    • C21D8/06
    • PURPOSE: A method for manufacturing an alloy steel wire rod and bar for mechanical structural steel is provided, which is characterized in that a portion of ferrite and pearlite occupies more than 85 % in microstructure of the alloy steel wire rod by cooling rate on the course of control cooling after hot rolling, thus it can exclude quenching and tempering processes. CONSTITUTION: The method for manufacturing an alloy steel wire rod and bar for mechanical structural steel includes the steps of hot rolling a wire rod comprising C 0.2 to 0.6 wt.%, Si 0.1 to 1.0 wt.%, Mn 0.1 to 1.5 wt.%, at least one element selected from the group consisting of Cr 0.1 to 2.0 wt.%, Ni 0.1 to 5.0 wt.%, Mo 0.1 to 1.5 wt.% and B 5 to 200 ppm, a balance of Fe and incidental impurities; cooling the hot rolled wire rod to 700°C at a cooling rate of greater than 5 deg.C/sec; and cooling the hot rolled wire rod to 500°C at a cooling rate of less than 0.5 deg.C/sec, wherein ferrite+pearlite occupies more than 85 % in microstructure 260, vickers hardness of the alloy steel wire rod and bar is less than 260 and incidental impurities is characterized by comprised of 0.1 wt.% or less of Al, 0.01 wt.% or less of N, 0.02 wt.% or less of P, 0.02 wt.% or less of S.
    • 33. 发明公开
    • 고인성 볼트의 제조방법
    • 生产具有高韧性的螺栓的方法
    • KR1020000042531A
    • 2000-07-15
    • KR1019980058751
    • 1998-12-26
    • 주식회사 포스코
    • 최해창최종교
    • C21D9/00
    • PURPOSE: A method is provided to produce a bolt improving high toughness and delayed fracture resistance as well as having high strength with a low surface decarbonization layer. 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 0.03wt% of nitrogen, less than 0.005wt% of oxygen and the remain of iron and incidental impurities. Herein, the steel billet contains one or two selected among a group consisting of 0.05 to 0.2wt% of vanadium, 0.05 to 0.2wt% 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 steel billet is heated and rolled to be a regular shaped bolt. The bolt is also heated more than for 20minutes and suddenly cooled at 70°C/sec of speed. The billet is isothermally heated more than for 20minutes and cooled by fluid or air to be a bolt having high toughness.
    • 目的:提供一种提高高韧性和延迟耐断裂性以及具有低表面脱碳层强度的螺栓的方法。 构成:钢坯由0.40〜0.60重量%的碳,2.0〜4.0重量%的硅,0.2〜0.8重量%的锰,0.2〜0.8重量%的铬,小于0.01重量%的磷,小于 0.01重量%的硫,0.005〜0.03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 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。 将钢坯加热轧制成规则形状的螺栓。 螺栓也被加热超过20分钟,并以70℃/秒的速度突然冷却。 坯料被等温加热20分钟以上,被流体或空气冷却成具有高韧性的螺栓。
    • 34. 发明公开
    • 고강도 볼트의 제조방법
    • 生产具有高强度的螺栓的方法
    • KR1020000042529A
    • 2000-07-15
    • KR1019980058749
    • 1998-12-26
    • 주식회사 포스코
    • 최해창최종교
    • C21D9/00
    • PURPOSE: A method is provided to produce a bolt having high strength with excellent critical delayed fracture stress ratio by forming a surface ferrite thin layer and a synthesized composition of ferrite and tempered martensite. CONSTITUTION: A steel billet composes 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 0.03wt% of nitrogen, less than 0.005wt% of oxygen and the remnant of iron and incidental impurities. Herein, the steel billet contains one or two elements selected among a group consisting of 0.05 to 0.2wt% of vanadium, 0.05 to 0.2wt% 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 steel billet is heated and rolled to be a regular shaped bolt. The bolt is heated for more than 20minutes and suddenly cooled at 70°C/sec of speed. The cooled bolt is tempered in a temperature of 300 to 600°C for more than 20minutes to be a bolt having high strength.
    • 目的:提供一种通过形成表面铁氧体薄层和铁素体和回火马氏体的合成组合来制造具有高强度和极好的临界延迟断裂应力比的螺栓的方法。 构成:钢坯的碳含量为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%,磷的0.01重量%以下,小于 0.01重量%的硫,0.005〜0.03重量%的氮,小于0.005重量%的氧和残留的铁和杂质。 这里,钢坯含有选自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。 将钢坯加热轧制成规则形状的螺栓。 螺栓加热20多分钟,并以70℃/秒的速度突然冷却。 冷却的螺栓在300至600℃的温度下回火超过20分钟,作为具有高强度的螺栓。
    • 39. 发明授权
    • 인성이 우수한 고강도 해변용 내후성강의 제조방법
    • KR101125944B1
    • 2012-03-21
    • KR1020040109217
    • 2004-12-21
    • 주식회사 포스코
    • 최종교정의경엄경근
    • C21D8/00C22C38/00
    • 본 발명은 우수한 인성과 강도를 나타내는 해변용 내후성 강재 및 그 제조방법에 관한 것으로, 보다 상세하게는 저온에서도 취성파괴를 일으키기 않으며 염소이온의 농도가 높은 부식환경하에서 우수한 내식성을 갖는 인성과 내식성이 우수한 고강도 내후성 강재 및 그 제조방법에 관한 것이다. 본 발명은, 중량%로, C: 0.15% 이하, Si: 1.0% 이하, Mn: 2.0% 이하, Cu: 0.2~1.0%, Ni: 0.2~5.0%, Al: 0.001~0.1%, P: 0.03% 이하, S: 0.002~0.03%, Ca: 0.001~0.01%, 나머지 Fe 및 기타 불가피한 불순물로 조성되고, 상기 성분중에서 Ca, S, Al, Si이 하기 관계식1,
      [관계식1] Ca(%)/S(%) > [1.5Al(%)+2Si(%)]
      을 만족하며, 강중 Ca계 비금속개재물중 수용성 CaS 개재물의 분율이 30% 이상인 해변 내후성이 우수한 강재를, 오스테나이트 미재결정영역 이하에서의 누적압하율이 30% 이상 되도록 열간압연한 후 하기 관계식 3을 만족하는 냉각속도로 하기 관계식 4를 만족하는 냉각정지온도까지 냉각하는 것을 특징으로 한다.
      [관계식3] 냉각속도(℃/sec) ≥ 9.7 / {[%Mn] + [%Cu] + [%Ni] + 20 × ( [%Si]/30 + [%Mo]/10 )}
      [관계식4] 냉각정지온도(℃) ≤ 865 - 272×[%C] - 74×[%Mn] - 9×[%Mo] - 5×[%Cu]
      고강도, 고인성, 내후성, 압하율, 오스테나이트 재결정온도
    • 40. 发明授权
    • 인성과 강도가 우수한 저항복비 해변용 내후성강의 제조방법
    • 具有优异韧性,高强度和低成因率的耐候性钢的生产方法,用于在海洋大气中使用
    • KR101126013B1
    • 2012-03-19
    • KR1020040109218
    • 2004-12-21
    • 주식회사 포스코
    • 엄경근정의경최종교
    • C21D8/00C22C38/00
    • 본 발명은 고강도와 저항복비로 구조물의 안정성을 확보할 수 있는 동시에 저온에서도 취성파괴를 일으키기 않으며 염소이온의 농도가 높은 부식환경하에서 우수한 내식성을 갖는 강도 및 인성이 우수하고 항복비가 낮은 고강도 내후성 강재 및 그 제조방법에 관한 것이다. 본 발명은, 중량%로, C: 0.15% 이하, Si: 1.0% 이하, Mn: 2.0% 이하, Cu: 0.2~1.0%, Ni: 0.2~5.0%, Al: 0.001~0.1%, P: 0.03% 이하, S: 0.002~0.03%, Ca: 0.001~0.01%, 나머지 Fe 및 기타 불가피한 불순물로 조성되고, 상기 성분중에서 Ca, S, Al, Si이 하기 관계식1,
      [관계식1] Ca(%)/S(%) > [1.5Al(%)+2Si(%)]
      을 만족하며, 강중 Ca계 비금속개재물중 수용성 CaS 개재물의 분율이 30% 이상인 해변 내후성이 우수한 강재를, 오스테나이트 미재결정영역 이하에서의 누적압하율이 30% 이상 되도록 열간압연한 후 하기 관계식 2를 만족하는 냉각속도로 하기 관계식 3을 만족하는 냉각정지온도까지 냉각하는 것을 특징으로 한다.
      [관계식2] 냉각속도(℃/sec) ≥ 15.2 / {[%Mn] + [%Cu] + [%Ni] + 20 × ( [%Si]/30 + [%Mo]/10 )}
      [관계식3] 냉각정지온도(℃) ≤ 765 - 270×[%C] - 90×[%Mn] - 37×[%Ni] - 83×[%Mo] + 135
      고강도, 고인성, 내후성, 압하율, 오스테나이트 재결정온도