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    • 53. 发明申请
    • NANO-PRECIPITATION STRENGTHENED ULTRA-HIGH STRENGTH CORROSION RESISTANT STRUCTURAL STEELS
    • 纳米沉积强化超强度耐腐蚀结构钢
    • WO2004108970A2
    • 2004-12-16
    • PCT/US2004/017898
    • 2004-06-04
    • QUESTEK INNOVATIONS LLCTUFTS, Brian, E.KUEHMANN, Charles, J.OLSON, Gregory, B.JOU, Herng-Jeng
    • TUFTS, Brian, E.KUEHMANN, Charles, J.OLSON, Gregory, B.JOU, Herng-Jeng
    • C21B
    • C21D6/001C21D1/22C21D1/28C21D6/002C21D6/007C21D6/04C21D8/021C21D2211/008C22C38/44C22C38/46C22C38/52
    • A nanocarbide precipitation strengthened ultrahigh-strength, corrosion resistant, structural steel possesses a combination of strength and corrosion resistance comprising in combination, by weight, about: 0.1 to 0.5 % carbon (C), about 8 to 17 % cobalt (Co), 0 to about 10 % nickel (Ni), about 6 to 12 % chromium (Cr), less than about 1 % silicon (Si), less than about 0.5 % manganese (Mn), and less than about 0.15 % copper (Cu), with additives selected from the group comprising about: less than 3% molybdenum (Mo), less than 0.3 % niobium (Nb), less than 0.8 % vanadium (V), less than 0.2 % tantalum (Ta), less than 3 % tungsten (W), and combinations thereof, with additional additives selected from the group comprising about: less than 0.2 % titanium (Ti), less than 0.2 % lanthanum (La) or other rare earth elements, less than 0.15 % zirconium (Zr), less than 0.005 % boron (B), and combinations thereof, impurities of less than about: 0.02 % sulfur (S), 0.012 % phosphorus (P), 0.015 % oxygen (O) and 0.015 % nitrogen (N), the remainder substantially iron (Fe), incidental elements and other impurities. The alloy is strengthened by nanometer scale M 2 C carbides within a fine lath martensite matrix from which enhanced chemical partitioning of Cr to the surface provides a stable oxide passivating film for corrosion resistance. The alloy, with a UTS in excess of 280 ksi, is useful for applications such as aircraft landing gear, machinery and tools used in hostile environments, and other applications wherein ultrahigh-strength, corrosion resistant, structural steel alloys are desired.
    • 纳米碳酸盐沉淀强化超高强度,耐腐蚀的结构钢具有强度和耐腐蚀性的组合,其组合包含约0.1至0.5%的碳(C),约8至17%的钴(Co),0 至约10%的镍(Ni),约6至12%的铬(Cr),小于约1%的硅(Si),小于约0.5%的锰(Mn)和小于约0.15%的铜(Cu) 其中添加剂选自小于3%的钼(Mo),小于0.3%的铌(Nb),小于0.8%的钒(V),小于0.2%的钽(Ta),小于3%的钨 (W),以及它们的组合与另外的添加剂组成,所述添加剂选自包括:小于0.2%的钛(Ti),小于0.2%的镧(La)或其它稀土元素,小于0.15%的锆(Zr) 小于0.005%的硼(B)及其组合,少于约0.02%的硫(S),0.012%的磷(P),0.015%的氧 (O)和0.015%氮(N),余量基本上为铁(Fe),附带元素和其他杂质。 该合金由细小的板条马氏体基体中的纳米尺度的M2C碳化物增强,从而从表面提高了Cr的化学分配提供了稳定的耐腐蚀氧化物钝化膜。 UTS超过280ksi的合金可用于诸如飞机起落架,恶劣环境中使用的机械和工具以及其他需要超高强度,耐腐蚀,结构钢合金的应用。
    • 57. 发明申请
    • METHOD FOR PRODUCING A STEEL SHEET HAVING IMPROVED STRENGTH, DUCTILITY AND FORMABILITY
    • 生产具有改进的强度,延展性和成型性的钢板的方法
    • WO2017109538A1
    • 2017-06-29
    • PCT/IB2015/059837
    • 2015-12-21
    • ARCELORMITTAL
    • JUN, Hyun JoVENKATASURYA, Pavan
    • C21D6/00C21D8/02C23C2/02C23C2/28C21D9/46C21D1/22C22C38/00C22C38/02C22C38/04C22C38/06
    • C22C38/06C21D1/22C21D6/001C21D6/002C21D6/005C21D6/008C21D8/02C21D8/0205C21D9/46C22C38/001C22C38/02C22C38/04C23C2/02C23C2/06C23C2/28C23C2/40
    • A method for producing a steel sheet having a microstructure consisting, in area fraction, of 20% to 50% of intercritical ferrite, 10% to 20% of retained austenite, 25% to 45% of tempered martensite, 10% to 20% of fresh martensite, and bainite, the sum of tempered martensite and bainite being comprised between 30% and 60%, the method comprising the following successive steps: - providing a cold-rolled steel sheet, the chemical composition of the steel containing in weight %: 0.18% ≤ C ≤ 0.25%, 0.9% ≤ Si ≤ 1.8% 0.02% ≤ Al ≤ 1.0%, with 1.25% ≤ Si+Al ≤ 2.35%,.5% ≤ Mn ≤ 2.5%, 0.010% ≤ Nb ≤ 0.035%, 0.10% ≤ Cr ≤ 0.40%, the remainder being Fe and unavoidable impurities, - annealing the steel sheet at an annealing temperature T A and for an annealing time t A so as to obtain a structure comprising from 50% to 80% of austenite and from 20% to 50% of ferrite, - quenching the sheet at a cooling rate comprised between 20°C/s and 50°C/s down to a quenching temperature QT comprised between Ms-50°C and Ms-5°C, - heating the sheet up to a partitioning temperature PT comprised between 375°C and 450°C and maintaining the sheet at the partitioning temperature PT for a partitioning time Pt of at least 50s, - cooling the sheet down to the room temperature.
    • 本发明提供一种钢板的制造方法,该钢板的组织以面积率计含有20〜50%的相间氧化铁,10〜20%的残余奥氏体,25〜45%的回火 马氏体,10%至20%的新鲜马氏体和贝氏体,回火马氏体和贝氏体的总和为30%至60%,所述方法包括以下连续步骤: - 提供冷轧钢板,化学组成 以重量百分比计,含有0.18%≤C≤0.25%,0.9%≤Si≤1.8%,0.02%≤Al≤1.0%,1.25%≤Si+Al≤2.35%,5%≤Mn≤2.5% ,0.010%≤Nb≤0.035%,0.10%≤Cr≤0.40%,余量为Fe和不可避免的杂质, - 在退火温度T℃下对钢板进行退火,退火时间t < 以获得包含50%至80%的奥氏体和20%至50%的铁素体的结构, - 以20℃/ s至50℃/ s的冷却速率淬火所述片材, 包括在Ms-50℃和Ms-5℃之间的淬火温度QT; - 将所述板加热至375℃和450℃之间的分配温度PT,并将所述板保持在 将分配温度PT分配时间Pt至少50s, - 将片材冷却至室温。
    • 58. 发明申请
    • METHOD FOR PRODUCING A STEEL SHEET HAVING IMPROVED STRENGTH, DUCTILITY AND FORMABILITY
    • 生产具有改进的强度,延展性和成型性的钢板的方法
    • WO2017108956A1
    • 2017-06-29
    • PCT/EP2016/082192
    • 2016-12-21
    • ARCELORMITTAL
    • JUN, Hyun JoVENKATASURYA, Pavan
    • C21D6/00C21D8/02C23C2/02C23C2/28C21D9/46C21D1/22C22C38/00C22C38/02C22C38/04C22C38/06
    • C22C38/06C21D1/22C21D6/001C21D6/002C21D6/005C21D6/008C21D8/02C21D8/0205C21D9/46C22C38/001C22C38/02C22C38/04C23C2/02C23C2/06C23C2/28C23C2/40
    • A method for producing a steel sheet having a microstructure consisting, in area fraction, of 20% to 50% of intercritical ferrite, 10% to 20% of retained austenite, 25% to 45% of tempered martensite, 10% to 20% of fresh martensite, and bainite, the sum of tempered martensite and bainite being comprised between 30% and 60%, the method comprising the following successive steps: - providing a cold-rolled steel sheet, the chemical composition of the steel containing in weight %: 0.18% ≤ C ≤ 0.25%, 0.9% ≤ Si ≤ 1.8%, 0.02% ≤ Al ≤ 1.0%, with 1.00% ≤ Si+Al ≤ 2.35%, 1.5% ≤ Mn ≤ 2.5%, 0.010% ≤ Nb ≤ 0.035%, 0.10% ≤ Cr ≤ 0.40%, the remainder being Fe and unavoidable impurities, - annealing the steel sheet at an annealing temperature T A and for an annealing time t A so as to obtain a structure comprising from 50% to 80% of austenite and from 20% to 50% of ferrite, - quenching the sheet at a cooling rate comprised between 20°C/s and 50°C/s down to a quenching temperature QT comprised between Ms-50°C and Ms-5°C, - heating the sheet up to a partitioning temperature PT comprised between 375°C and 450°C and maintaining the sheet at the partitioning temperature PT for a partitioning time Pt of at least 50s, - cooling the sheet down to the room temperature.
    • 本发明提供一种钢板的制造方法,该钢板的组织以面积率计含有20〜50%的相间氧化铁,10〜20%的残余奥氏体,25〜45%的回火 马氏体,10%至20%的新鲜马氏体和贝氏体,回火马氏体和贝氏体的总和为30%至60%,所述方法包括以下连续步骤: - 提供冷轧钢板,化学组成 以重量百分比计:0.18%≤C≤0.25%,0.9%≤Si≤1.8%,0.02%≤Al≤1.0%,其中1.00%≤Si+Al≤2.35%,1.5%≤Mn≤2.5% ,0.010%≤Nb≤0.035%,0.10%≤Cr≤0.40%,余量为Fe和不可避免的杂质, - 在退火温度T℃下对钢板进行退火,退火时间t < 以获得包含50%至80%的奥氏体和20%至50%的铁素体的结构, - 以20℃/ s和20℃/ s之间的冷却速率淬火该片材, 50℃/秒降至包括在Ms-50℃和Ms-5℃之间的淬火温度QT, - 将所述片加热至包含在375℃和450℃之间的分配温度PT,并将所述片保持在 将分配温度PT分配时间Pt至少50s, - 将片材冷却至室温。