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    • 3. 发明授权
    • 극연질 고탄소 열연 강판 및 그 제조 방법
    • 高柔性高碳钢板及其制造方法
    • KR101050698B1
    • 2011-07-20
    • KR1020087023624
    • 2007-02-26
    • 제이에프이 스틸 가부시키가이샤
    • 기무라히데유키후지타다케시나카무라노부유키아오키나오야사사키마사토우에오카사토시이이즈카슌지
    • C22C38/00C21D8/02
    • B21B3/00C21D9/46C22C38/02C22C38/04
    • 가공성이 우수한 극연질 고탄소 열연 강판을 제공한다. C : 0.2 ∼ 0.7% 의 고탄소 열연 강판으로서, 페라이트 평균 입경이 20㎛ 이상, 입경 10㎛ 이하인 페라이트 입자의 체적률이 20% 이하, 탄화물 평균 입경이 0.10㎛ 이상 2.0㎛ 미만, 애스펙트비가 5 이상인 탄화물 비율이 15% 이하, 탄화물끼리가 접촉하는 비율이 20% 이하인 조직을 갖는 강판이다. 그리고, 조압연 후, 마무리 압연 입측 온도가 1100℃ 이하, 최종 2 패스의 압하율을 12% 이상, 또한 마무리 온도를 (Ar3 - 10)℃ 이상으로 하는 마무리 압연을 실시하고, 이어서 마무리 압연 후 1.8 초 이내에 120℃/초 초과의 냉각 속도로 600℃ 이하의 냉각 정지 온도까지 1 차 냉각을 실시하고, 이어서 2 차 냉각에 의해 600℃ 이하의 온도로 유지한 후, 580℃ 이하의 온도에서 권취하고, 산세정 후, 상자형 소둔법에 의해, 680℃ 이상 Acl 변태점 이하의 온도에서 구상화 소둔함으로써 제조된다.
      극연질 고탄소 열연 강판
    • 提供一种加工性优良的高度柔软且高碳的热轧钢板。 C:小于高碳热轧钢板的0.2〜0.7%时,铁素体平均晶粒直径超过20㎛,10㎛粒径小于铁素体晶粒的体积率为20%以下,碳化物0.10㎛2.0㎛,5或更大的纵横比的平均粒径 另外,碳化物比率为15%以下,碳化物接触比率为20%以下的结构。 然后,将粗轧,然后精轧入口温度为12%,小于1100℃的还原率,最终2道次,和(Ar 3相 - 10)的终轧温度以上进行精的℃以上轧制,接着1.8精轧后 秒内,并进行一次冷却到小于600℃的冷却停止温度为120℃/秒的冷却速度,大于然后将混合物保持在600℃以下的温度由二次冷却,卷绕在温度不高于580℃ 然后在酸洗后通过箱式退火,在不低于Ac1相变点的温度下进行不低于680℃的球化退火。
    • 4. 发明公开
    • 가공성이 우수하고, 또한 열처리 후의 강도인성이 우수한 열연박강판 및 그 제조방법
    • 热轧钢板在热处理和加工过程中具有优异的可加工性和强度和韧性。
    • KR1020090014391A
    • 2009-02-10
    • KR1020087031228
    • 2007-07-06
    • 제이에프이 스틸 가부시키가이샤
    • 나카무라노부유키세토카즈히로
    • C22C38/00B21B1/26B21B3/00C21D9/46
    • C22C38/06B21B1/26B21B3/00C21D1/20C21D1/25C21D8/0226C21D8/0263C21D8/0273C21D8/0426C21D8/0463C21D8/0473C21D9/48C21D2211/002C22C38/02C22C38/04C22C38/14
    • The invention provides a hot-rolled steel sheet of less than 6mm in thickness which has high strength corresponding to a tensile strength of 440MPa or above and is excellent both in workability and in strength and toughness after heat treatment; and a process for the production of the sheet. The process comprises subjecting a raw steel material which contains C: 0.10 to 0.20%, Si, Mn, Al, P, S and N: properly adjusted contents, Ti: 0.01 to 0.15%, and B: 0.0005 to 0.0050% to hot rolling wherein the finishing temperature of finish rolling is 820 to 880°C, cooling the hot-rolled steel material at a surface cooling rate of 15 to 50°C/s until such a temperature region that the surface temperature is 550 to 650°C, and winding up it in a coil in the temperature region. The process can give a high-strength and-ductility hot-rolled steel sheet which has a bainitic ferrite structure homogeneous in the thicknesswise direction and exhibits a tensile strength of 440 to 640MPa and an elongation of 20% or above. Further, high-strength and-toughness products having tensile strength of 980MPa or above and vTrs of-100°C or below can be produced by subjecting the hot-rolled steel sheet additionally to working and heat treatment.
    • 本发明提供一种厚度小于6mm的热轧钢板,其强度相当于440MPa以上的拉伸强度,加工性,热处理后的强度和韧性均优异; 以及用于制造片材的方法。 该方法包括对含有C:0.10〜0.20%,Si,Mn,Al,P,S和N的原料钢进行适当调整的含量,Ti:0.01〜0.15%,B:0.0005〜0.0050% 精轧的精轧温度为820〜880℃,以15〜50℃/ s的表面冷却速度将热轧钢材冷却至表面温度为550〜650℃的温度区域, 并将其卷绕在温度区域的线圈中。 该方法可以得到在厚度方向上具有均匀的贝氏体铁素体结构的高强度和延展性的热轧钢板,其拉伸强度为440〜640MPa,伸长率为20%以上。 此外,通过对热轧钢板进行加工和热处理,可以制造拉伸强度为980MPa以上且vTrs为-100℃以下的高强度和韧性产品。
    • 7. 发明公开
    • 극연질고탄소열연강판의 제조방법
    • 脱碳高碳热轧钢板及其制造方法
    • KR1020080009719A
    • 2008-01-29
    • KR1020077026706
    • 2006-09-19
    • 제이에프이 스틸 가부시키가이샤
    • 키무라히데유키후지타타케시나카무라노부유키우에오카사토시아오키나오야미츠즈카켄이치
    • C22C38/00C21D8/02
    • C22C38/02C21D1/32C21D6/008C21D8/0263C21D9/46C22C38/04C22C38/12C22C38/14C22C38/18C22C38/32C22C38/06C21D8/0226C21D8/0273
    • A dead-soft high-carbon hot-rolled steel sheet which contains 0.2-0.7% C, 0.01-1.0% Si, 0.1-1.0% Mn, up to 0.03 P, up to 0.035% S, up to 0.08% Al, and up to 0.01%N and optionally further contains 0.0010-0.0050% B and 0.05-0.30% Cr, with the remainder being Fe and unavoidable impurities. The structure has an average ferrite grain diameter of 20 mum or larger, the proportion of ferrite grains having a grain diameter of 10 mum or larger being 80% by volume or higher, and has an average carbide grain diameter of 0.10-2.0 mum, excluding 2.0 mum. After rough rolling, the web is subjected to finish rolling at a finishing temperature of (Ar3-20°C) or higher so as to result in a draft in the final pass of 10% or higher. Within 2 seconds after the finish rolling, primary cooling is conducted, in which the web is cooled to a cooling termination temperature of 600°C or lower at a cooling rate exceeding 120 °C/sec. This web is held at a temperature of 600°C or lower in secondary cooling, subsequently wound up at a temperature of 580°C or lower, washed with an acid, and then subjected to spheroidizing annealing at a temperature which is not lower than 680°C but is not higher than transformation point Ac1 to thereby produce the target steel sheet.
    • 一种死软的高碳热轧钢板,其含有0.2-0.7%C,0.01-1.0%Si,0.1-1.0%Mn,至多0.03P,至多0.035%S,至多0.08%Al,以及 高达0.01%的N,任选地还含有0.0010-0.0050%B和0.05-0.30%的Cr,其余的是Fe和不可避免的杂质。 该结构的平均铁素体晶粒直径为20μm以上,粒径为10μm以上的铁素体晶粒的比例为80体积%以上,碳化物平均粒径为0.10〜2.0μm,除了 2.0妈 粗轧后,在(Ar3〜20℃)的终轧温度下进行精轧,得到最终通过的通气量为10%以上。 在精轧后2秒钟内,进行一次冷却,其中以超过120℃/秒的冷却速度将幅材冷却至600℃以下的冷却终止温度。 在二次冷却下,将该纤维网保持在600℃以下的温度,然后在580℃以下的温度下,用酸洗涤,然后在不低于680℃的温度下进行球化退火 ℃,但不高于相变点Ac1,从而制造目标钢板。