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公开(公告)号：US20090071578A1
公开(公告)日：2009-03-19
申请号：US12291118
申请日：2008-11-06
IPC分类号： C21D8/02
CPC分类号： C22C38/001 , C21D8/0226 , C21D8/0263 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/18 , C22C38/22
摘要： A method for manufacturing a high carbon hot-rolled steel sheet. The method including the steps of hot-rolling, primary cooling, secondary cooling, coiling, acid-washing and annealing. The primary cooling step is to cool the hot-rolled steel sheet down to a cooling termination temperature of 450° C. to 600° C. at a cooling rate of higher than 120° C./sec. The secondary cooling step is to apply a secondary cooling to hold the primarily cooled hot-rolled steel sheet at a temperature of 450° C. to 650° C. until coiling.
摘要翻译： 高碳热轧钢板的制造方法。 该方法包括热轧，一次冷却，二次冷却，卷取，酸洗和退火的步骤。 主冷却步骤是以高于120℃/秒的冷却速度将热轧钢板冷却至450℃至600℃的冷却终止温度。 二次冷却步骤是在450℃至650℃的温度下进行二次冷却以将主要冷却的热轧钢板保持在卷绕状态。
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公开(公告)号：US07879163B2
公开(公告)日：2011-02-01
申请号：US12291118
申请日：2008-11-06
IPC分类号： C21D8/02
CPC分类号： C22C38/001 , C21D8/0226 , C21D8/0263 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/18 , C22C38/22
摘要： A method for manufacturing a high carbon hot-rolled steel sheet. The method including the steps of hot-rolling, primary cooling, secondary cooling, coiling, acid-washing and annealing. The primary cooling step is to cool the hot-rolled steel sheet down to a cooling termination temperature of 450° C. to 600° C. at a cooling rate of higher than 120° C./sec. The secondary cooling step is to apply a secondary cooling to hold the primarily cooled hot-rolled steel sheet at a temperature of 450° C. to 650° C. until coiling.
摘要翻译： 高碳热轧钢板的制造方法。 该方法包括热轧，一次冷却，二次冷却，卷取，酸洗和退火的步骤。 主冷却步骤是以高于120℃/秒的冷却速度将热轧钢板冷却至450℃至600℃的冷却终止温度。 二次冷却步骤是在450℃至650℃的温度下进行二次冷却以将主要冷却的热轧钢板保持在卷绕状态。
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公开(公告)号：US20050199322A1
公开(公告)日：2005-09-15
申请号：US11064049
申请日：2005-02-22
CPC分类号： C22C38/001 , C21D8/0226 , C21D8/0263 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/18 , C22C38/22
摘要： The high carbon hot-rolled steel sheet contains, in terms of percentages of mass, 0.10 to 0.7% C, 2.0% or less Si, 0.20 to 2.0% Mn, 0.03% or less P, 0.03% or less S, 0.1% or less Sol.Al, 0.01% or less N, and the balance being Fe and inevitable impurities, and has a structure of ferrite having 6 μm or less average grain size and carbide having 0.10 μm or more and less than 1.2 μm of average grain size. The volume ratio of the carbide having 2.0 μm or more of grain size is 10% or less. The volume ratio of the ferrite containing no carbide is 5% or less. The manufacturing method thereof has the steps of hot-rolling, primary cooling, holding, coiling, acid washing, and annealing. The primary cooling step is to cool the hot-rolled steel sheet down to cooling termination temperatures ranging from 450° C. to 600° C. at cooling rates of higher than 120° C./sec. The holding step is to apply secondary cooling to hold the primarily cooled hot-rolled steel sheet at a temperature range from 450° C. to 650° C. until coiling.
摘要翻译： 高碳热轧钢板以质量百分比计含有C：0.10〜0.7％，Si：2.0％以下，Mn：0.20〜2.0％，0.03％以下，P：0.03％以下，S：0.1％ 较少的Sol.Al，0.01％以下的N，余量为Fe和不可避免的杂质，具有平均粒径为6μm以下的铁素体结构，平均粒径为0.10μm以上且小于1.2μm的碳化物 。 2.0μm以上的粒径的碳化物的体积比为10％以下。 不含碳化物的铁素体的体积比为5％以下。 其制造方法具有热轧，一次冷却，保持，卷取，酸洗和退火的步骤。 主要的冷却步骤是以高于120℃/秒的冷却速度将热轧钢板冷却至450℃至600℃的冷却终止温度。 保持步骤是在450℃至650℃的温度范围内进行二次冷却以将主要冷却的热轧钢板保持在卷绕状态。
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公开(公告)号：US20090139611A1
公开(公告)日：2009-06-04
申请号：US12084173
申请日：2006-12-25
CPC分类号： C21D9/46 , C21D8/0205 , C21D2211/005 , C22C38/001 , C22C38/02 , C22C38/06 , C22C38/38 , C23C2/02 , C23C2/28
摘要： A galvanized steel sheet excellent in strength-ductility balance and bake-hardenability as well as a method for producing the same are provided. The chemical components thereof include C, Si, Mn, P, S, Al, N and Cr at content ratios of 0.005 to 0.04%, 1.5% or lower, 1.0 to 2.0%, 0.10% or lower, 0.03% or lower, 0.01 to 0.1%, less than 0.008% and 0.2 to 1.0%, respectively, with Mn (mass %)+1.29Cr (mass %) being in the range of 2.1 to 2.8, and further include iron and unavoidable impurities as the balance. The structure thereof consists of a ferrite phase and a martensite phase with a volume fraction being at least 3.0% and less than 10%, the average particle diameter of the ferrite is larger than 6 μm and not more than 15 μm, and 90% or more of the martensite phase exists in a ferrite grain boundary. In addition, in the production process of such a galvanized steel sheet, a steel sheet obtained in a cold rolling step is annealed at a temperature being at least the Ac1 point and not more than the Ac3 point.
摘要翻译： 提供强度 - 延展性平衡和烘烤硬化性优异的镀锌钢板及其制造方法。 其化学成分包括C：Si，Mn，P，S，Al，N和Cr，含量比例为0.005〜0.04％，1.5％以下，1.0〜2.0％，0.10％以下，0.03％以下，0.01 至0.1％，小于0.008％和0.2〜1.0％，Mn（质量％）+ 1.29Cr（质量％）在2.1〜2.8的范围内，还包含铁和不可避免的杂质作为平衡。 其结构由铁素体相和体积分率为3.0％以上且小于10％的马氏体相组成，铁素体的平均粒径大于6μm，15μm以下且90μm以下， 更多的马氏体相存在于铁素体晶界中。 另外，在这样的镀锌钢板的制造工序中，在冷轧工序中得到的钢板在至少Ac1点且不大于Ac3点的温度下退火。
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公开(公告)号：US20110192504A1
公开(公告)日：2011-08-11
申请号：US12927331
申请日：2010-11-12
IPC分类号： C21D8/02
CPC分类号： C21D9/46 , C21D8/0205 , C21D2211/005 , C22C38/001 , C22C38/02 , C22C38/06 , C22C38/38 , C23C2/02 , C23C2/28
摘要： A method for producing a galvanized steel sheet including (a) melting a steel having a steel composition comprising 0.005 to 0.04 mass % C, 1.5 mass % or lower Si, 1.0 to 2.0 mass % Mn, 0.10 mass % or lower P, 0.03 mass % or lower S, 0.01 to 0.1 mass % Al, less than 0.008 mass % N and 0.2 to 1.0 mass % Cr, wherein Mn (mass %)+1.29 Cr (mass %) is 2.1 to 2.8, and the balance being iron and unavoidable impurities, (b) hot rolling and cold rolling the steel from step (a) to provide a steel sheet, and (c) annealing the steel sheet from step (c) at an annealing temperature of at least the Ac1 point and not more than the Ac3 point, wherein the galvanized steel sheet has a structure which includes a ferrite phase and a martensite phase with a volume fraction being at least 3.0% and less than 10%, the average particle diameter of the ferrite is larger than 6 μm and not more than 15 μm, and 90% or more of the martensite phase exists in a ferrite grain boundary.
摘要翻译： 一种镀锌钢板的制造方法，其特征在于，具有（a）将钢组成为含有0.005〜0.04质量％的C，1.5质量％以下的Si，1.0〜2.0质量％的Mn，0.10质量％以下的P，0.03质量％ ％以下S，0.01〜0.1质量％Al，小于0.008质量％N和0.2〜1.0质量％Cr，其中，Mn（质量％）+ 1.29Cr（质量％）为2.1〜2.8，余量为铁和 不可避免的杂质，（b）对步骤（a）中的钢进行热轧和冷轧以提供钢板，（c）在至少Ac1点的退火温度下退火步骤（c）的钢板，而不是更多 其中镀锌钢板具有铁素体相和马氏体相的结构，其体积分数为3.0％以上且小于10％，铁素体的平均粒径大于6μm， 不大于15μm，在铁素体晶界中存在90％以上的马氏体相。
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6.发明申请公开(公告)号：US20100282376A1
公开(公告)日：2010-11-11
申请号：US12294639
申请日：2007-02-26
申请人： Hideyuki Kimura , Takeshi Fujita , Nobuyuki Nakamura , Naoya Aoki , Masato Sasaki , Satoshi Ueoka , Shunji Iizuka
发明人： Hideyuki Kimura , Takeshi Fujita , Nobuyuki Nakamura , Naoya Aoki , Masato Sasaki , Satoshi Ueoka , Shunji Iizuka
摘要： An ultra soft high carbon hot-rolled steel sheet has excellent workability. The steel sheet is a high carbon hot-rolled steel sheet containing 0.2 to 0.7% C, and has a structure in which mean grain size of ferrite is 20 μm or larger, the volume percentage of ferrite grains having 10 μm or smaller size is 20% or less, mean diameter of carbide is in a range from 0.10 μm to smaller than 2.0 μm, the percentage of carbide grains having 5 or more of aspect ratio is 15% or less, and the contact ratio of carbide is 20% or less.
摘要翻译： 超柔软的高碳热轧钢板的加工性优异。 该钢板是含有0.2〜0.7％C的高碳热轧钢板，其铁素体的平均粒径为20μm以上的结构，具有10μm以下的铁素体晶粒的体积百分比为20 ％以下，碳化物的平均直径为0.10μm以上且小于2.0μm，纵横比为5以上的碳化物的比例为15％以下，碳化物的接触率为20％以下 。
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7.发明申请公开(公告)号：US20090065106A1
公开(公告)日：2009-03-12
申请号：US11919964
申请日：2006-09-19
申请人： Hideyuki Kimura , Takeshi Fujita , Nobuyuki Nakamura , Satoshi Ueoka , Naoya Aoki , Kenichi Mitsuzuka
发明人： Hideyuki Kimura , Takeshi Fujita , Nobuyuki Nakamura , Satoshi Ueoka , Naoya Aoki , Kenichi Mitsuzuka
CPC分类号： C22C38/02 , C21D1/32 , C21D6/008 , C21D8/0263 , C21D9/46 , C22C38/04 , C22C38/12 , C22C38/14 , C22C38/18 , C22C38/32
摘要： The present invention provides an ultra soft high carbon hot-rolled steel sheet. The ultra soft high carbon hot-rolled steel sheet contains 0.2% to 0.7% of C, 0.01% to 1.0% of Si, 0.1% to 1.0% of Mn, 0.03% or less of P, 0.035% or less of S, 0.08% or less of Al, 0.01% or less of N, and the balance being Fe and incidental impurities and further contains 0.0010% to 0.0050% of B and 0.05% to 0.30% of Cr in some cases. In the texture of the steel sheet, an average ferrite grain diameter is 20 μm or more, a volume ratio of ferrite grains having a grain diameter of 10 μm or more is 80% or more, and an average carbide grain diameter is in the range of 0.10 to less than 2.0 μm. In addition, the steel sheet is manufactured by the steps, after rough rolling, performing finish rolling at a reduction ratio of 10% or more and at a finish temperature of (Ar3−20° C.) or more in a final pass, then performing first cooling within 2 seconds after the finish rolling to a cooling stop temperature of 600° C. or less at a cooling rate of more than 120° C./sec, then performing second cooling so that the steel thus processed is held at 600° C. or less, then performing coiling at 580° C. or less, followed by pickling, and then performing spheroidizing annealing at a temperature in the range of 680° C. to the Ac1 transformation point.
摘要翻译： 本发明提供一种超软质高碳热轧钢板。 超软质高碳热轧钢板含有C：0.2〜0.7％，Si：0.01〜1.0％，Mn：0.1〜1.0％，P：0.03％以下，S：0.035％以下，0.08以下 Al以下，Al：0.01％以下，余量为Fe和附带杂质，在某些情况下还含有0.0010〜0.0050％的B和0.05〜0.30％的Cr。 在钢板的织构中，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体积比为80％以上，平均碳化物粒径为 为0.10〜小于2.0μm。 另外，在粗轧后，在最终通过时以10％以上的还原率和最终温度（Ar 3〜20℃）以上的精轧进行精轧，然后， 在精轧后2秒内进行冷却至冷却停止温度600℃以下，冷却速度大于120℃/秒，然后进行第二次冷却，使被处理钢被保持在600℃ ℃以下，然后在580℃以下进行卷取，然后酸洗，然后在680℃的温度下进行Ac1相变点的球化退火。
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公开(公告)号：US07909950B2
公开(公告)日：2011-03-22
申请号：US11919964
申请日：2006-09-19
申请人： Hideyuki Kimura , Takeshi Fujita , Nobuyuki Nakamura , Satoshi Ueoka , Naoya Aoki , Kenichi Mitsuzuka
发明人： Hideyuki Kimura , Takeshi Fujita , Nobuyuki Nakamura , Satoshi Ueoka , Naoya Aoki , Kenichi Mitsuzuka
IPC分类号： C21D8/00
CPC分类号： C22C38/02 , C21D1/32 , C21D6/008 , C21D8/0263 , C21D9/46 , C22C38/04 , C22C38/12 , C22C38/14 , C22C38/18 , C22C38/32
摘要： The present invention provides an ultra soft high carbon hot-rolled steel sheet. The ultra soft high carbon hot-rolled steel sheet contains 0.2% to 0.7% of C, 0.01% to 1.0% of Si, 0.1% to 1.0% of Mn, 0.03% or less of P, 0.035% or less of S, 0.08% or less of Al, 0.01% or less of N, and the balance being Fe and incidental impurities and further contains 0.0010% to 0.0050% of B and 0.05% to 0.30% of Cr in some cases. In the texture of the steel sheet, an average ferrite grain diameter is 20 μm or more, a volume ratio of ferrite grains having a grain diameter of 10 μm or more is 80% or more, and an average carbide grain diameter is in the range of 0.10 to less than 2.0 μm. In addition, the steel sheet is manufactured by the steps, after rough rolling, performing finish rolling at a reduction ratio of 10% or more and at a finish temperature of (Ar3−20° C.) or more in a final pass, then performing first cooling within 2 seconds after the finish rolling to a cooling stop temperature of 600° C. or less at a cooling rate of more than 120° C./sec, then performing second cooling so that the steel thus processed is held at 600° C. or less, then performing coiling at 580° C. or less, followed by pickling, and then performing spheroidizing annealing at a temperature in the range of 680° C. to the Ac1 transformation point.
摘要翻译： 本发明提供一种超软质高碳热轧钢板。 超软质高碳热轧钢板含有C：0.2〜0.7％，Si：0.01〜1.0％，Mn：0.1〜1.0％，P：0.03％以下，S：0.035％以下，0.08以下 Al以下，Al：0.01％以下，余量为Fe和附带杂质，在某些情况下还含有0.0010〜0.0050％的B和0.05〜0.30％的Cr。 在钢板的织构中，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体积比为80％以上，平均碳化物粒径为 为0.10〜小于2.0μm。 另外，在粗轧后，在最终通过时以10％以上的还原率和最终温度（Ar 3〜20℃）以上的精轧进行精轧，然后， 在精轧后2秒内进行冷却至冷却停止温度600℃以下，冷却速度大于120℃/秒，然后进行第二次冷却，使被处理钢被保持在600℃ ℃以下，然后在580℃以下进行卷取，然后酸洗，然后在680℃的温度下进行Ac1相变点的球化退火。
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公开(公告)号：US06767417B2
公开(公告)日：2004-07-27
申请号：US10255349
申请日：2002-09-26
申请人： Takeshi Fujita , Kenichi Mitsuzuka , Nobuyuki Nakamura , Toshiaki Urabe , Katsutoshi Ito , Hideyuki Tsurumaru
发明人： Takeshi Fujita , Kenichi Mitsuzuka , Nobuyuki Nakamura , Toshiaki Urabe , Katsutoshi Ito , Hideyuki Tsurumaru
IPC分类号： C22C3814
CPC分类号： C22C38/02 , C21D1/42 , C21D9/46 , C21D2211/003 , C22C38/001 , C22C38/002 , C22C38/04 , C22C38/06 , C22C38/14 , Y02P10/253
摘要： The present invention relates to a steel sheet that consists essentially of 0.10 to 0.37% C, 1% or less Si, 2.5% or less Mn, 0.1% or less P, 0.03% or less S, 0.01 to 0.1% sol.Al, 0.0005 to 0.0050% N, 0.0003 to 0.0050% B, by mass, and balance of Fe, [14B/(10.8N)] being 0.5 or more, average particle size of precipitate BN being 0.1 &mgr;m or more, and grain size of prior austenite after the hardening treatment being 2 to 25 &mgr;m. The steel sheet according to the present invention allows an inexpensive hardening treatment method to be applied to improve the strength to a level required for the structural components and the functional components of automobiles, while providing excellent toughness after the hardening treatment.
摘要翻译： 本发明涉及一种钢板，其主要由0.10〜0.37％的C，1％以下的Si，2.5％以下的Mn，0.1％以下的P，0.03％以下的S，0.01〜0.1％的溶胶， 0.0005〜0.0050％N，0.0003〜0.0050％B，质量％，余量为Fe，[14B /（10.8N）]为0.5以上，析出物BN的平均粒径为0.1μm以上， 硬化处理后的奥氏体为2〜25μm。 根据本发明的钢板允许采用便宜的硬化处理方法，以提高强度达到汽车的结构部件和功能部件所需的水平，同时在硬化处理之后提供优异的韧性。
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公开(公告)号：US06652671B2
公开(公告)日：2003-11-25
申请号：US09961843
申请日：2001-09-24
IPC分类号： C22C3802
CPC分类号： C22C38/06 , C21D8/02 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/0273 , C21D2211/003 , C22C38/002 , C22C38/04
摘要： The present invention relates to a high carbon steel sheet having chemical composition specified by JIS G 4051 (Carbon steels for machine structural use), JIS G 4401 (Carbon tool steels) or JIS G 4802 (Cold-rolled steel strips for springs), wherein the ratio of number of carbides having a diameter of 0.6 &mgr;m or less with respect to all the carbides is 80% or more, more than 50 carbides having a diameter of 1.5 &mgr;m or larger exist in 2500 &mgr;m2 of observation field area of electron microscope, and the &Dgr;r is more than −0.15 to less than 0.15. The high carbon steel sheet of the invention is excellent in hardenability and toughness, and formable with a high dimensional precision.
摘要翻译： 本发明涉及JIS G 4051（机械结构用碳素钢），JIS G 4401（碳素工具钢）或JIS G 4802（弹簧用冷轧钢带）所规定的化学成分的高碳钢板，其中， 直径为0.6μm以下的碳化物的数量相对于全部碳化物的比例为80％以上，直径为1.5μm以上的50个以上的碳化物存在于2500μm2的观察场面积 电子显微镜，Deltar大于-0.15至小于0.15。 本发明的高碳钢板的淬透性和韧性优异，且尺寸精度高。
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