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1.发明授权公开(公告)号：US10443110B2
公开(公告)日：2019-10-15
申请号：US15126838
申请日：2014-09-09
发明人： Shigeki Kitsuya , Katsuyuki Ichimiya , Kazukuni Hase , Teruhisa Kinugawa , Naoki Matsunaga , Kenji Hayashi , Masayuki Horie , Yusuke Terazawa , Shigeru Endo
IPC分类号： C21D9/46 , C22C38/54 , C22C38/50 , C22C38/48 , C22C38/46 , C22C38/44 , C22C38/42 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D8/02 , C21D1/18 , B22D11/00 , B21J5/02 , C22C38/58 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C22C38/32 , C21D7/13 , C21D8/00 , C21D9/00
摘要： A high toughness and high tensile strength thick steel plate has a plate thickness of 100 mm or more, wherein a reduction of area in a center of the plate thickness by tension in a plate thickness direction is 40% or more. Thus, a high tensile strength thick steel plate with excellent strength and toughness in a center of the plate thickness can be obtained with no need for a larger production line, even in the case of producing a high strength thick steel plate for which the addition amount of alloying element needs to be increased.
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公开(公告)号：US10358688B2
公开(公告)日：2019-07-23
申请号：US15304702
申请日：2015-04-24
IPC分类号： C21D9/46 , C21D8/02 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/14 , C22C38/16 , C22C38/42 , C22C38/44 , C22C38/50 , C22C38/54 , C22C38/58 , B21B1/22 , B21B1/26 , C22C38/00 , C22C38/46 , C22C38/48 , B21B3/00
摘要： A steel plate has excellent strength and toughness in a mid-thickness part thereof, despite having a plate thickness of 100 mm or greater. The steel plate has a chemical composition containing specific amounts of C, Si, Mn, P, S, Cr, Ni, Al, N, B, and O, with the balance being Fe and incidental impurities, and having an equivalent carbon content CeqIIW of 0.65 or greater. The steel plate has a yield strength of 620 MPa or greater, a plate thickness of 100 mm or greater, and has a microstructure in which prior γ grain size in a mid-thickness part of the steel plate has a maximum value, expressed as an equivalent circle diameter, of 150 μm or less, and a total area ratio of martensite and bainite in the mid-thickness part is 80% or greater.
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公开(公告)号：US09945015B2
公开(公告)日：2018-04-17
申请号：US14349209
申请日：2012-10-01
发明人： Masao Yuga , Shigeki Kitsuya , Kenji Hayashi , Minoru Suwa
IPC分类号： C22C38/00 , C22C38/42 , C21D8/02 , C22C38/58 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/44 , C22C38/46 , C22C38/50 , C22C38/54 , C21D9/50
CPC分类号： C22C38/42 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/02 , C21D8/0205 , C21D8/0226 , C21D8/0247 , C21D8/0263 , C21D8/1222 , C21D9/46 , C21D9/50 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/18 , C22C38/44 , C22C38/46 , C22C38/50 , C22C38/54 , C22C38/58
摘要： A high-tensile steel plate has a chemical composition containing, by mass, specific amounts of C, Mn, Si, P, S, Al, Ni, B, N, one or more elements selected from Cr, Mo, V, Cu, Ti, and Ca as needed, Ceq≤0.80, and a center-segregation zone hardness index HCS satisfying 5.5[C]4/3+15[P]+0.90[Mn]+0.12[Ni]+0.53[Mo]≤2.5. The hardness of a center-segregation zone satisfies HVmax/HVave≤1.35+0.006/C−t/750. A steel having the above-described chemical composition is subjected to hot rolling at a specific slab-heating temperature at a specific rolling reduction ratio, subsequently reheated, cooled at a cooling rate of 0.3° C./s or more until the temperature of a central portion in a plate-thickness direction reaches 350° C. or less, and tempered to a specific temperature range.
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公开(公告)号：US20170044639A1
公开(公告)日：2017-02-16
申请号：US15304702
申请日：2015-04-24
IPC分类号： C21D9/46 , C22C38/58 , C22C38/54 , C22C38/50 , C22C38/48 , C22C38/46 , C22C38/44 , C22C38/42 , C22C38/16 , C22C38/14 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D8/02 , B21B1/22
CPC分类号： C21D9/46 , B21B1/22 , B21B1/26 , B21B3/00 , B21B2001/225 , C21D8/02 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D2211/002 , C21D2211/008 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/14 , C22C38/16 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58
摘要： A steel plate has excellent strength and toughness in a mid-thickness part thereof, despite having a plate thickness of 100 mm or greater. The steel plate has a chemical composition containing specific amounts of C, Si, Mn, P, S, Cr, Ni, Al, N, B, and 0, with the balance being Fe and incidental impurities, and having an equivalent carbon content Cer of 0.65 or greater. The steel plate has a yield strength of 620 MPa or greater, a plate thickness of 100 mm or greater, and has a microstructure in which prior γ grain size in a mid-thickness part of the steel plate has a maximum value, expressed as an equivalent circle diameter, of 150 μm or less, and a total area ratio of martensite and bainite in the mid-thickness part is 80% or greater.
摘要翻译： 尽管板厚为100mm以上，钢板在其中厚部分具有优异的强度和韧性。 钢板具有含有特定量的C，Si，Mn，P，S，Cr，Ni，Al，N，B和0的化学成分，余量为Fe和附带杂质，具有等效碳含量Cer 为0.65以上。 钢板的屈服强度为620MPa以上，板厚为100mm以上，并且具有以下的微观结构，其中钢板的中间部分中的γ粒径之前为最大值，表示为 当量圆直径为150μm以下，中厚部的马氏体和贝氏体的总面积比为80％以上。
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公开(公告)号：US10351926B2
公开(公告)日：2019-07-16
申请号：US15525672
申请日：2015-11-17
IPC分类号： C21D9/46 , B21J1/02 , C22C38/00 , C22C38/58 , C21D6/00 , C21D7/13 , C21D8/00 , C21D8/02 , C21D9/00 , C21D1/18 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , B21J5/02
摘要： A thick steel plate is provided by heating a continuously-cast slab, hot forging the continuously-cast slab using opposing dies having respective short sides differing such that when a short side length of a die having a shorter one of the short sides is taken to be 1, a short side length of a die having a longer one of the short sides is 1.1 to 3.0, allowing cooling to obtain a steel raw material, reheating the steel raw material, performing hot rolling of the steel raw material including at least two passes carried out, allowing cooling to obtain a thick steel plate, reheating the thick steel plate to at least the Ac3 temperature and no higher than 1050° C., rapidly cooling the thick steel plate to 350° C. or lower, and tempering the thick steel plate at at least 550° C. and no higher than 700° C.
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公开(公告)号：US10000833B2
公开(公告)日：2018-06-19
申请号：US14770853
申请日：2014-03-11
IPC分类号： C22C38/50 , C22C38/58 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/54 , C21D1/78 , C21D6/00 , C21D8/02 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/32 , C22C38/38 , C21D1/25
CPC分类号： C22C38/58 , C21D1/25 , C21D1/78 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/021 , C21D8/0226 , C21D8/0263 , C21D2211/001 , C21D2211/002 , C21D2211/004 , C21D2211/008 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/32 , C22C38/38 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/50 , C22C38/54
摘要： A thick, high-toughness high-strength steel plate has excellent strength and toughness in the central area through the plate thickness. The thick steel plate has a specific chemical composition and includes a microstructure having, throughout an entire region in the plate thickness direction, an average prior austenite grain size of not more than 50 μm and a martensite and/or bainite phase area fraction of not less than 80%. A continuously cast slab having the specific chemical composition is heated to 1200° C. to 1350° C., hot worked with a strain rate of not more than 3/s and a cumulative working reduction of not less than 15%, and thereafter hot rolled and heat treated.
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公开(公告)号：US11959157B2
公开(公告)日：2024-04-16
申请号：US17264295
申请日：2019-07-31
发明人： Daichi Izumi , Shigeki Kitsuya , Keiji Ueda , Koichi Nakashima
CPC分类号： C22C38/38 , C21D8/0226 , C21D8/0263 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/06 , C22C38/26 , C22C38/28 , C21D2211/001
摘要： Provided is a high-Mn steel having excellent low-temperature toughness and excellent surface characteristics. A high-Mn steel comprises: a chemical composition containing, in mass %, C: 0.100 to 0.700%, Si: 0.05 to 1.00%, Mn: 20.0 to 35.0%, P: ≤0.030%, S: ≤0.0070%, Al: 0.010 to 0.070%, Cr: 0.50 to 5.00%, N: 0.0050 to 0.0500%, O: ≤0.0050%, Ti: ≤0.005%, and Nb: ≤0.005%, with a balance consisting of Fe and inevitable impurities; and a microstructure having austenite as a matrix, wherein in the microstructure, a Mn concentration of a Mn-concentrated portion is 38.0% or less, and an average KAM value is 0.3 or more, yield stress is 400 MPa or more, absorbed energy vE−196 in a Charpy impact test at −196° C. is 100 J or more, and percent brittle fracture is less than 10%.
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公开(公告)号：US11819909B2
公开(公告)日：2023-11-21
申请号：US17423557
申请日：2020-01-22
CPC分类号： B22D11/16 , C21D8/0226 , C22C38/02 , C22C38/06 , C22C38/58
摘要： The method for manufacturing a high-manganese steel cast slab according to the present invention includes manufacturing a cast slab by continuously casting a molten high-manganese steel having a specific chemical composition. In the manufacture, in a continuous-casting machine or during transportation before subsequent charging into a heating furnace for hot rolling, a processing strain is applied to the cast slab having a surface temperature of 600° C. or higher and 1100° C. or lower in such an amount that a processing strain amount calculated by a certain formula is 3.0% or more and 10.0% or less.
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公开(公告)号：US20160312327A1
公开(公告)日：2016-10-27
申请号：US15103093
申请日：2014-12-10
IPC分类号： C21D9/46 , C22C38/54 , C22C38/50 , C22C38/48 , C22C38/46 , C22C38/44 , C22C38/42 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D8/02 , C22C38/58
CPC分类号： C21D9/46 , C21D8/02 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D9/50 , C21D2211/004 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58
摘要： A steel plate includes a predetermined chemical composition, in which B is controlled to be less than 0.0003%, and the balance is Fe and incidental impurities. The steel plate also includes precipitates containing Ti, Nb, and Mo and having a mean particle size of 20 nm or less, the relationship [Nb]/([Ti]+[Nb]+[Mo])≧0.3 being satisfied, where [Ti] is the Ti content, [Nb] is the Nb content, and [Mo] is the Mo content, thereby providing a thick, high tensile strength steel plate that is suitable for use in steel structures such as marine structures, ships, pressure vessels, and penstocks, has a yield stress (YS) of 460 MPa or greater, and has excellent low-temperature toughness of the heat-affected zone in a multilayer weld (CTOD property) and excellent strength and toughness after Post Weld Heat Treatment (PWHT property).
摘要翻译： 钢板包括预定的化学组成，其中B被控制在小于0.0003％，余量为Fe和杂质。 钢板还含有含有Ti，Nb，Mo的平均粒径为20nm以下的析出物，满足[Nb] /（[Ti] + [Nb] + [Mo]）≥0.3的关系， [Ti]为Ti含量，[Nb]为Nb含量，[Mo]为Mo含量，由此提供厚度高的抗拉强度钢板，适用于海洋结构，船舶， 压力容器和回液管的屈服应力（YS）为460MPa以上，并且在多层焊接中的热影响区域（CTOD性质）具有优异的低温韧性，并且在焊后热处理后具有优异的强度和韧性 （PWHT属性）。
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10.发明申请公开(公告)号：US20140246131A1
公开(公告)日：2014-09-04
申请号：US14349209
申请日：2012-10-01
发明人： Masao Yuga , Shigeki Kitsuya , Kenji Hayashi , Minoru Suwa
IPC分类号： C22C38/58 , C22C38/54 , C22C38/50 , C22C38/00 , C22C38/44 , C22C38/42 , C22C38/04 , C22C38/02 , C21D8/02 , C22C38/46
CPC分类号： C22C38/42 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/02 , C21D8/0205 , C21D8/0226 , C21D8/0247 , C21D8/0263 , C21D8/1222 , C21D9/46 , C21D9/50 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/18 , C22C38/44 , C22C38/46 , C22C38/50 , C22C38/54 , C22C38/58
摘要： A high-tensile steel plate has a chemical composition containing, by mass, specific amounts of C, Mn, Si, P, S, Al, Ni, B, N, one or more elements selected from Cr, Mo, V, Cu, Ti, and Ca as needed, Ceq≦0.80, and a center-segregation zone hardness index HCS satisfying 5.5[C]4/3+15[P]+0.90[Mn]+0.12[Ni]+0.53[Mo]≦2.5. The hardness of a center-segregation zone satisfies HVmax/HVave≦1.35+0.006/C−t/750. A steel having the above-described chemical composition is subjected to hot rolling at a specific slab-heating temperature at a specific rolling reduction ratio, subsequently reheated, cooled at a cooling rate of 0.3° C./s or more until the temperature of a central portion in a plate-thickness direction reaches 350° C. or less, and tempered to a specific temperature range.
摘要翻译： 高强度钢板的化学成分含有C，Mn，Si，P，S，Al，Ni，B，N的特定量的选自Cr，Mo，V，Cu， Ti和Ca，Ceq＆NlE; 0.80，中心偏析带硬度指数HCS满足5.5 [C] 4/3 + 15 [P] +0.90 [Mn] +0.12 [Ni] +0.53 [Mo] 2.5。 中心偏析带的硬度满足HVmax / HVave＆nlE; 1.35 + 0.006 / C-t / 750。 将具有上述化学组成的钢在特定的轧制压下率下以特定的板坯加热温度进行热轧，随后再加热，以0.3℃/ s以上的冷却速度冷却直到 板厚方向的中心部分达到350℃以下，回火至特定的温度范围。
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