公开(公告)号：US20080017283A1

公开(公告)日：2008-01-24

申请号：US11795192

申请日：2006-06-30

申请人： Keiichi Maruta ,  Tohru Hayashi ,  Nobutaka Kurosawa ,  Hideto Kimura ,  Takaaki Toyooka ,  Kazukuni Hase ,  Katsumi Yamada

发明人： Keiichi Maruta ,  Tohru Hayashi ,  Nobutaka Kurosawa ,  Hideto Kimura ,  Takaaki Toyooka ,  Kazukuni Hase ,  Katsumi Yamada

IPC分类号： C21D9/46 ,  C22C38/00

CPC分类号： C21D9/46 ,  C22C38/00

摘要： A steel for machine structural use with a better strength-ductility-toughness balance than maraging steel and applications thereof are provided. The steel for machine structural use with excellent strength, ductility, and toughness contains, in percent by mass, more than 0.30% to 0.5% of carbon, 1.0% or less of silicon, 1.5% or less of manganese, 0.025% or less of aluminum, 0.3% to 0.5% of molybdenum, and 0.0005% to 0.01% of boron, and the balance is iron and incidental impurities. The steel has a structure including at least 90% by volume of martensitic structure. The martensitic structure includes blocks having a size of 1.5 μm or less. Dissolved boron is contained in an amount of at least 0.0005% and is present at boundaries of prior austenite grains in a concentration at least 1.5 times that in the prior austenite grains.

摘要翻译： 提供了一种具有比马氏体时效钢更好的强度 - 延性 - 韧性平衡的机械结构用钢及其应用。 具有优异的强度，延展性和韧性的机械结构用钢，以质量％计含有超过0.30％〜0.5％的碳，1.0％以下的硅，1.5％以下的锰，0.025％以下的 铝，0.3〜0.5％的钼和0.0005〜0.01％的硼，余量为铁和杂质。 该钢具有至少90体积％的马氏体组织。 马氏体结构包括尺寸为1.5μm或更小的块。 溶解硼的含量至少为0.0005％，并且在现有奥氏体晶粒的边界处，其浓度至少为现有奥氏体晶粒中的1.5倍。

公开(公告)号：US20080264524A1

公开(公告)日：2008-10-30

申请号：US11922746

申请日：2006-10-27

申请人： Keiichi Maruta ,  Tohru Hayashi ,  Nobutaka Kurosawa ,  Hideto Kimura ,  Takaaki Toyooka ,  Kazukuni Hase

发明人： Keiichi Maruta ,  Tohru Hayashi ,  Nobutaka Kurosawa ,  Hideto Kimura ,  Takaaki Toyooka ,  Kazukuni Hase

IPC分类号： C22C38/54

CPC分类号： C21D1/25 ,  C21D1/10 ,  C21D7/02 ,  C21D9/0093 ,  C21D2211/008 ,  C22C38/00 ,  Y02P10/253

摘要： A high-strength steel having excellent character of delayed fracture can be manufactured at a low cost without adding expensive alloy elements such as Ni, Co or V in large quantities. The steel including a steel microstructure in which a ratio of martensite phase is 90% or more and a diameter of prior austenite grains is 10 μm or less, the steel microstructure being made by hardening and then tempering at 100° C. to 400° C., the steel including C: more than 0.30% and not more than 0.50% by mass, Si: not more than 1.0% by mass, Mn: not more than 1.5% by mass, Ti: not more than 0.1% by mass, Mo: not less than 0.3% and not more than 0.50% by mass, B: not less than 0.0005% and not more than 0.01% by mass, and a balance composed of Fe and inevitable impurities.

摘要翻译： 可以以低成本制造具有优异延迟断裂特性的高强度钢，而不需要大量添加诸如Ni，Co或V的昂贵的合金元素。 包括马氏体相的比率为90％以上，原奥氏体晶粒直径为10μm以下的钢组织的钢，钢组织通过硬化然后在100℃回火至400℃ 包括C：大于0.30％且不大于0.50质量％的钢，Si：不大于1.0质量％，Mn：不大于1.5质量％，Ti：不大于0.1质量％ Mo：0.3％以上且0.50质量％以下，B：0.0005％以上且0.01质量％以下，余量由Fe和不可避免的杂质构成。

公开(公告)号：US20070000582A1

公开(公告)日：2007-01-04

申请号：US10555511

申请日：2004-07-16

申请人： Akihiro Matsuzaki ,  Yasuhiro Omori ,  Nobutaka Kurosawa ,  Tohru Hayashi ,  Takaaki Toyooka ,  Katsumi Yamada

发明人： Akihiro Matsuzaki ,  Yasuhiro Omori ,  Nobutaka Kurosawa ,  Tohru Hayashi ,  Takaaki Toyooka ,  Katsumi Yamada

IPC分类号： C21D1/10

CPC分类号： C22C38/22 ,  C21D1/10 ,  C21D9/28 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/02 ,  C22C38/04 ,  Y02P10/253

摘要： The present invention provides a steel material for induction quenching, containing 0.3% to 0.7% of C, 1.1% or less of Si, 0.2% to 1.1% of Mn, 0.05% to 0.6% of Mo, 0.06% or less of S, 0.025% or less of P, 0.25% or less of Al, 0.3% or less of Cr on a mass basis, and the balance being Fe and unavoidable impurities. The steel material has a ferrite structure and a pearlite structure, the total volume fraction of the ferrite structure and the pearlite structure is 90% or more, the thickness of the ferrite structure is 30 μm or less, and the average prior austenite grain diameter of a hard layer obtained by induction quenching is 12 μm or less. Since having superior machinability and superior fatigue strength after induction quenching, this steel material is suitable, for an automobile drive shaft, constant velocity joint, and the like.

摘要翻译： 本发明提供一种用于感应淬火的钢材，其含有C：0.3〜0.7％，Si为1.1％以下，Mn为0.2〜1.1％，Mo为0.05〜0.6％，S为0.06％以下， 0.025％以下的P，0.25％以下的Al，0.3％以下的Cr，其余为Fe和不可避免的杂质。 该钢材具有铁素体结构和珠光体组织，铁素体组织和珠光体组织的总体积分数为90％以上，铁素体组织的厚度为30μm以下，前者的奥氏体平均粒径为 通过感应淬火得到的硬质层为12μm以下。 由于在感应淬火后具有优异的机械加工性和优异的疲劳强度，因此该钢材适用于汽车传动轴，等速万向接头等。

公开(公告)号：US20060196583A1

公开(公告)日：2006-09-07

申请号：US10556298

申请日：2004-07-16

申请人： Tohru Hayashi ,  Yasuhisa Omori ,  Nobutaka Kurosawa ,  Akihiro Matsuzaki ,  Takaaki Toyooka ,  Katsumi Yamada

发明人： Tohru Hayashi ,  Yasuhisa Omori ,  Nobutaka Kurosawa ,  Akihiro Matsuzaki ,  Takaaki Toyooka ,  Katsumi Yamada

IPC分类号： C22C38/14

CPC分类号： C22C38/02 ,  C21D1/10 ,  C21D9/28 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  Y02P10/253

摘要： The present invention provides a machine structural part composed of 0.3% to 0.7% of C, 0.30% or less of Si, 0.2% to 2.0% of Mn, 0.005% to 0.25% of Al, 0.005% to 0.1% of Ti, 0.05% to 0.6% of Mo, 0.0003% to 0.006% of B, 0.06% or less of S, 0.020% or less of P, 0.0030% or less of O on a mass basis, and the balance being Fe and unavoidable impurities. In addition, the machine structural part has a hard layer on at least a part of a surface thereof formed by induction quenching, an average prior austenite grain diameter of the hard layer is 7 μm or less, and the maximum diameter of a non-metal inclusion composed of oxides is 15 μm or less. Since having a high fatigue strength, this machine structural part is suitable for an automobile drive shaft, constant velocity joint, and the like.

摘要翻译： 本发明提供一种机械结构部件，其由C：0.3％〜0.7％，Si：0.30％以下，Mn：0.2〜2.0％，Al：0.005〜0.25％，Ti：0.005〜0.1％ Mo：0.000〜0.6％，B：0.06％以下，S：0.06％以下，P：0.020％以下，O：0.0030％以下，余量为Fe和不可避免的杂质。 此外，机械结构部件在其通过感应淬火形成的表面的至少一部分上具有硬质层，硬质层的平均先前的奥氏体晶粒直径为7μm以下，非金属的最大直径 由氧化物构成的包合物为15μm以下。 由于具有高的疲劳强度，该机械结构部件适用于汽车传动轴，等速万向节等。

公开(公告)号：US20070163687A1

公开(公告)日：2007-07-19

申请号：US11587700

申请日：2005-02-01

申请人： Nobutaka Kurosawa ,  Yasuhiro Omori ,  Tohru Hayashi ,  Aklhiro Matsuzaki ,  Takaaki Toyooka

发明人： Nobutaka Kurosawa ,  Yasuhiro Omori ,  Tohru Hayashi ,  Aklhiro Matsuzaki ,  Takaaki Toyooka

IPC分类号： C21D1/00

CPC分类号： F16C33/62 ,  C21D9/28 ,  C21D9/30 ,  C21D2211/001 ,  C22C38/02 ,  C22C38/04 ,  F16C3/06 ,  F16C19/186 ,  F16C2326/02 ,  F16D3/223 ,  F16D2003/22326 ,  F16D2250/00 ,  F16D2300/10 ,  F16H55/06

摘要： A component for machine structural use having improved fatigue strength. The component for machine structural use is produced by subjecting at least a part of a steel material to hardening, and the hardened structure is controlled such that the average grain diameter of former austenitic grains is 12 μm or less and the maximum grain diameter does not exceed four times the average grain diameter.

摘要翻译： 机械结构用部件具有改善的疲劳强度。 用于机械结构使用的部件是通过使钢材的至少一部分进行硬化而进行硬化，并且控制硬化结构，使得前奥氏体晶粒的平均粒径为12μm以下，最大粒径不超过 是平均粒径的四倍。

公开(公告)号：US20080247900A1

公开(公告)日：2008-10-09

申请号：US11587731

申请日：2005-07-05

申请人： Toru Hayashi ,  Yasuhiro Ohmori ,  Nobutaka Kurosawa ,  Akihiro Matsuzaki ,  Takaaki Toyooka ,  Katsumi Yamada

发明人： Toru Hayashi ,  Yasuhiro Ohmori ,  Nobutaka Kurosawa ,  Akihiro Matsuzaki ,  Takaaki Toyooka ,  Katsumi Yamada

IPC分类号： C22C38/00 ,  C21D1/42 ,  C22C38/20

CPC分类号： C22C38/02 ,  C21D1/10 ,  C22C38/001 ,  C22C38/002 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  C22C38/60 ,  Y02P10/253

摘要： There is provided a component for machine structure having a hardened layer through an induction hardening in at least a part thereof, and more improving fatigue strengths as compared with the conventional ones, in which the hardened layer has a hardness Hv of not less than 750 and an average grain size of prior austenite grains is not more than 7 μm over a full thickness of the hardened layer.

摘要翻译： 提供了一种机械结构部件，其具有通过其至少一部分的感应淬火的硬化层，并且与常规硬化层的硬度Hv不小于750的淬火层相比，具有更高的疲劳强度， 现有奥氏体晶粒的平均晶粒尺寸在硬化层的整个厚度上不超过7μm。

公开(公告)号：US5558727A

公开(公告)日：1996-09-24

申请号：US393445

申请日：1995-02-23

申请人： Kazuya Miura ,  Shusaku Takagi ,  Takaaki Hira ,  Toshiyuki Kato ,  Nobutaka Kurosawa

发明人： Kazuya Miura ,  Shusaku Takagi ,  Takaaki Hira ,  Toshiyuki Kato ,  Nobutaka Kurosawa

IPC分类号： C21D1/19 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/18

CPC分类号： C21D8/0273 ,  C21D8/0226 ,  C21D1/19 ,  C21D2211/005 ,  C21D2211/008

摘要： A high strength steel sheet for automobiles which exhibits excellent press-formability strength against impact resistance at a high strain rate is hot rolled under specific conditions, or is cold rolled from hot rolled sheet which is prepared under conventional conditions, with the cold rolled steel being annealed under specific conditions. The steel sheet comprises 0.010-0.10 wt % of C, not greater than 1.50 wt % of Si, 0.50-3.00 wt % of Mn, not greater than 0.010 wt % of S and 0.01-0.1 wt % of Al, and one kind or two kinds selected from 0.05-0.15 wt % of P and 0.5-1.5 wt % of Cr, and the balance being Fe and inevitable impurities and having a structure mainly composed of 2-30 vol % of martensite phase and a ferrite phase containing a solution C not greater than 0.0010 wt %.

摘要翻译： 用于汽车的高强度钢板在高应变率下表现出优异的耐冲击强度，在特定条件下进行热轧，或者由常规条件下制备的热轧板进行冷轧，冷轧钢为 在特定条件下退火。 该钢板包含0.010-0.10重量％的C，不大于1.50重量％的Si，0.50-3.00重量％的Mn，不大于0.010重量％的S和0.01-0.1重量％的Al，以及一种或 两种选自P为0.05-0.15重量％和Cr为0.5-1.5重量％，余量为Fe和不可避免的杂质，主要由2-30体积％的马氏体相组成的结构和含有溶液的铁素体相 C不大于0.0010重量％。

公开(公告)号：US20090202384A1

公开(公告)日：2009-08-13

申请号：US12367577

申请日：2009-02-09

申请人： Akio Tosaka ,  Sinjiro Kaneko ,  Yoichi Tominaga ,  Noriyuki Katayama ,  Nobutaka Kurosawa ,  Kei Sakata ,  Osamu Furukimi

发明人： Akio Tosaka ,  Sinjiro Kaneko ,  Yoichi Tominaga ,  Noriyuki Katayama ,  Nobutaka Kurosawa ,  Kei Sakata ,  Osamu Furukimi

IPC分类号： C22C38/00 ,  C22C38/16 ,  C22C38/18 ,  C22C38/08 ,  C22C38/14 ,  C22C38/12

CPC分类号： C21D8/0226 ,  C21D8/0236 ,  C21D2221/02 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12

摘要： A high tensile strength hot-rolled steel sheet having superior strain aging hardenability, which has high formability and stable quality characteristics, and in which satisfactory strength is obtained when the steel sheet is formed into automotive components, thus enabling the reduction in weight of automobile bodies. Specifically, a method for producing a high tensile strength hot-rolled steel sheet having superior strain aging hardenability with a BH of 80 MPa or more, a ΔTS of 40 MPa or more, and a tensile strength of 440 MPa or more includes the steps of heating a steel slab to 1,000° C. or more, the steel slab containing, in percent by mass, 0.15% or less of C, 0.45% or less of Si, 3.0% or less of Mn, 0.08% or less of P, 0.02% or less of S, 0.02% or less of Al, 0.0050% to 0.0250% of N, and optionally 0.1% or less in total of at least one of more than 0.02% to 0.1% of Nb and more than 0.02% to 0.1% of V, the ratio N (mass %)/Al (mass %) being 0.86 or more; rough-rolling the steel slab to form a sheet bar; finish-rolling the sheet bar at a finishing temperature of 800° C. or more; cooling at a cooling rate of 20° C. to 40° C./s or more within 0.5 second after the finish-rolling; and coiling at a temperature of 650° C. to 450° C. or less.

摘要翻译： 具有优异的应变时效淬透性的高拉伸强度热轧钢板，其成形性高，质量特性稳定，当将钢板形成汽车部件时，能够获得令人满意的强度，能够减轻汽车车身的重量 。 具体而言，制造具有优异的应变时效淬透性，BH为80MPa以上，ΔTTS为40MPa以上，拉伸强度为440MPa以上的高强度热轧钢板的制造方法，其特征在于， 将钢坯加热至1000℃以上时，所述钢坯以质量％计含有0.15％以下的C，0.45％以下的Si，3.0％以下的Mn，0.08％以下的P， 0.02％以下的S，0.02％以下的Al，0.0050％〜0.0250％的N，任意的0.1％以下，Nb中的0.02％以上0.1％以下，0.02％以上，0.02％以上， 0.1％的V，N（质量％）/ Al（质量％）的比例为0.86以上; 粗轧钢板以形成板材; 在800℃或更高的终轧温度下对板材进行精轧; 在精轧后的0.5秒内以20℃至40℃/秒的冷却速度冷却; 并在650℃至450℃或更低的温度下卷取。

公开(公告)号：US07252724B2

公开(公告)日：2007-08-07

申请号：US10643227

申请日：2003-08-18

申请人： Akio Tosaka ,  Sinjiro Kaneko ,  Yoichi Tominaga ,  Noriyuki Katayama ,  Nobutaka Kurosawa ,  Kei Sakata ,  Osamu Furukimi

发明人： Akio Tosaka ,  Sinjiro Kaneko ,  Yoichi Tominaga ,  Noriyuki Katayama ,  Nobutaka Kurosawa ,  Kei Sakata ,  Osamu Furukimi

IPC分类号： C21D8/02

CPC分类号： C21D8/0226 ,  C21D8/0236 ,  C21D2221/02 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12

摘要： A high tensile strength hot-rolled steel sheet having superior strain aging hardenability, which has high formability and stable quality characteristics, and in which satisfactory strength is obtained when the steel sheet is formed into automotive components, thus enabling the reduction in weight of automobile bodies is provided. Specifically, a method for producing a high tensile strength hot-rolled steel sheet having superior strain aging hardenability with a BH of 80 MPa or more, a ΔTS of 40 MPa or more, and a tensile strength of 440 MPa or more includes the steps of heating a steel slab to 1,000° C. or more, the steel slab containing, in percent by mass 0.15% or less of C, 2.0% or less of Si, 3.0% or less of Mn, 0.08% or less of P, 0.02% or less of S, 0.02% or less of Al, 0.0050% to 0.0250% of N, and optionally 0.1% or less in total of at least one of more than 0.02% to 0.1% of Nb and more than 0.02% to 0.1% of V, the ratio N (mass %)/Al (mass %) being 0.3 or more, rough-rolling the steel slab to form a sheet bar; finish-rolling the sheet bar at a finishing temperature of 800° C. or more; cooling at a cooling rate of 20° C. to 40° C./s or more within 0.5 second after the finish-rolling; and coiling at a temperature of 650° C. to 450° C. or less.

摘要翻译： 具有优异的应变时效淬透性的高拉伸强度热轧钢板，其成形性高，质量特性稳定，当将钢板形成汽车部件时，能够获得令人满意的强度，能够减轻汽车车身的重量 被提供。 具体而言，制造具有优异的应变时效淬透性，BH为80MPa以上，ΔTS为40MPa以上，拉伸强度为440MPa以上的高强度热轧钢板的制造方法，其特征在于， 将钢坯加热至1000℃以上时，含有以质量％计含有0.15％以下的Si，2.0％以下的Si，3.0％以下的Mn，0.08％以下的P，0.02 S％以下，Al：0.02％以下，N：0.0050〜0.0250％，Nb：0.02〜0.1％，Nb：0.02〜0.1％ V的百分比，N（质量％）/ Al（质量％）的比例为0.3以上，对钢坯进行粗轧以形成板坯; 在800℃或更高的终轧温度下对板材进行精轧; 在精轧后的0.5秒内以20℃至40℃/秒的冷却速度冷却; 并在650℃至450℃或更低的温度下卷取。