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1. 发明授权

US08512487B2 Seamless expandable oil country tubular goods and manufacturing method thereof 有权
标题翻译：无缝膨胀油国家管状物品及其制造方法
公开(公告)号：US08512487B2
公开(公告)日：2013-08-20
申请号：US10573277
申请日：2004-10-18
申请人： Yoshio Yamazaki , Yukio Miyata , Mitsuo Kimura , Kei Sakata , Masahito Tanaka
发明人： Yoshio Yamazaki , Yukio Miyata , Mitsuo Kimura , Kei Sakata , Masahito Tanaka
IPC分类号： C21D9/08
CPC分类号： C22C38/02 , C21D1/185 , C21D1/28 , C21D8/10 , C21D2211/005 , C22C38/08 , C22C38/22 , C22C38/38 , Y10T428/12
摘要： A seamless expandable oil country tubular article, which has a superior pipe expansion property in a expanding process at an expand ratio of more than about 30% although having a high strength such as a tensile strength (TS) of about 600 MPa or more, and a manufacturing method thereof, the seamless expandable oil country tubular goods being in an as-rolled state or being processed, optionally necessary, by inexpensive nonthermal-refining type heat treatment.
摘要翻译：一种无缝可膨胀油状国产管状制品，虽然具有约600MPa以上的抗拉强度（TS）等高强度，但膨胀率大于约30％的膨胀过程具有优异的管膨胀特性，其制造方法，无缝可膨胀油国家管状物品处于轧制状态或通过廉价的非热精炼型热处理任选需要加工。

2. 发明申请

US20070116975A1 Seamless expandable oil country tubular goods and manufacturing method thereof 有权
标题翻译：无缝膨胀油国家管状物品及其制造方法
公开(公告)号：US20070116975A1
公开(公告)日：2007-05-24
申请号：US10573277
申请日：2004-10-18
申请人： Yoshio Yamazaki , Yukio Miyata , Mitsuo Kimura , Kei Sakata , Masahito Tanaka
发明人： Yoshio Yamazaki , Yukio Miyata , Mitsuo Kimura , Kei Sakata , Masahito Tanaka
IPC分类号： B22D7/00
CPC分类号： C22C38/02 , C21D1/185 , C21D1/28 , C21D8/10 , C21D2211/005 , C22C38/08 , C22C38/22 , C22C38/38 , Y10T428/12
摘要： The present invention provides a seamless expandable oil country tubular goods, which has a superior pipe expansion property in a expanding process at an expand ratio of more than 30% although having a high strength such as a tensile strength (TS) of 600 MPa or more, and a manufacturing method thereof, the seamless expandable oil country tubular goods being in an as-rolled state or being processed, whenever necessary, by inexpensive nonthermal-refining type heat treatment. In a particular product, 0.010% to less than 0.10% of C, 0.05% to 1% of Si, 0.5% to 4% of Mn, 0.03% or less of P, 0.015% or less of S, 0.01% to 0.06% of Al, 0.007% or less of N, and 0.005% or less of O are contained, and at least one of Nb, Mo, and Cr is contained in the range of 0.01% to 0.2% of Nb, 0.05% to 0.5% of Mo, and 0.05% to 1.5% of Cr, so that Mn+0.9×Cr+2.6×Mo≧2.0 and 4×C−0.3×Si+Mn+1.3×Cr+1.5×Mo≦4.5 are satisfied. The micro-structure of a steel pipe preferably contains ferrite at a volume fraction of 5% to 70%, and the balance is substantially composed of a low temperature-transforming phase. The manufacturing condition includes at least one of a: a rolling finish temperature of 800° C. or more in pipe forming, b: normalizing treatment after pipe forming, and c: holding of a steel pipe in a dual-phase region for five minutes or more after pipe forming, followed by air cooling.
摘要翻译：本发明提供一种无缝可膨胀油田国家管件，其膨胀率大于30％时的膨胀过程具有优良的管膨胀特性，尽管其抗拉强度（TS）为600MPa以上的高强度及其制造方法，无缝可膨胀油国家管状物品如果需要，通过廉价的非热精炼型热处理，处于轧制状态或被加工。在特定的产品中，C：0.010〜小于0.10％，Si：0.05〜1％，Mn：0.5〜4％，P：0.03％以下，S：0.015％以下，S：0.01〜0.06％的Al，0.007％以下的N和0.005％以下的O，Nb，Mo，Cr中的至少一种含有Nb的0.01〜0.2％的范围，0.05〜0.5％的Mo和0.05〜1.5％的Cr，使得满足Mn + 0.9xCr + 2.6×Mo> = 2.0和4×C-0.3×Si + Mn + 1.3×Cr + 1.5×Mo <= 4.5。钢管的微结构优选含有体积分数为5〜70％的铁素体，余量基本上由低温转化相组成。制造条件包括以下中的至少一个：成形中的轧制终轧温度为800℃以上，b：成形后的规范化处理，以及c：在双相区域内保持钢管5分钟或更多，然后进行空气冷却。

3. 发明授权

US08747578B2 Steel for structural part of automobile and method for producing the same 有权
标题翻译：汽车结构部件用钢及其制造方法
公开(公告)号：US08747578B2
公开(公告)日：2014-06-10
申请号：US10582717
申请日：2004-12-09
申请人： Shunsuke Toyoda , Kei Sakata , Akio Sato , Kouichi Kaneko , Hiroshi Kawaguchi
发明人： Shunsuke Toyoda , Kei Sakata , Akio Sato , Kouichi Kaneko , Hiroshi Kawaguchi
IPC分类号： C22C38/44
CPC分类号： C22C38/02 , C21D8/0226 , C21D8/10 , C22C38/001 , C22C38/002 , C22C38/04 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/38
摘要： A steel having excellent formability, fatigue endurance after quenching, low temperature toughness, resistance for hydrogen embrittlement, and corrosion fatigue endurance. A method includes heating a steel slab at 1160° C. to 1320° C., hot-finish-rolling the steel slab at a finisher delivery temperature of 750° C. to 980° C., and then coiling the hot-rolled steel at a coiling temperature of 560° C. to 740° C. after slow cooling for a time of 2 seconds or more to produce a hot-rolled steel strip having a structure in which the ferrite grain diameter df corresponding to a circle is 1.1 μm to less than 1.2 μm and the ferrite volume fraction Vf is 30% to 98%, the steel slab containing 0.18 to 0.29% of C, 0.06 to 0.45% of Si, 0.91 to 1.85% of Mn, 0.019% or less of P, 0.0029% or less of S, 0.015 to 0.075% of sol. Al, 0.0049% or less of N, 0.0049% or less of O, 0.0001 to 0.0029% of B, 0.001 to 0.019% of Nb, 0.001 to 0.029% of Ti, 0.001 to 0.195% of Cr, and 0.001 to 0.195% of Mo so that the carbon equivalent Ceq satisfies a value of 0.4 to less than 0.58, and the total x of multiplying factors including that for B according to Grossmann satisfies a value of 1.2 to less than 1.7.
摘要翻译：具有优异的成形性，淬火后疲劳耐久性，低温韧性，耐氢脆性和耐腐蚀疲劳耐久性的钢。一种方法包括将钢坯在1160℃加热至1320℃，在750℃至980℃的整理器输送温度下对钢坯进行热精轧，然后卷取热轧钢在缓慢冷却2秒钟以上的卷取温度为560℃〜740℃的条件下，制造出具有如下结构的热轧钢带，其中，相当于圆的铁素体晶粒直径df为1.1μm 小于1.2μm，铁素体体积分率Vf为30〜98％，含有0.18〜0.29％的C，0.06〜0.45％的Si，0.91〜1.85％的Mn，0.019％以下的P， 0.0029％以下的S，0.015〜0.075％的溶胶。 Al：0.0049％以下，○0.0049％以下，B：0.0001〜0.0029％，Nb：0.001〜0.019％，Ti：0.001〜0.029％，Cr：0.001〜0.195％，以及0.001〜0.195％ Mo使得碳当量Ceq满足0.4至小于0.58的值，并且包括根据Grossmann的乘积因子的总和x满足1.2至小于1.7的值。

4. 发明授权

US07887649B2 High-tensile strength welded steel tube for structural parts of automobiles and method of producing the same 有权
标题翻译：汽车结构件高强度焊接钢管及其制造方法
公开(公告)号：US07887649B2
公开(公告)日：2011-02-15
申请号：US12307439
申请日：2007-06-19
申请人： Shunsuke Toyoda , Masatoshi Aratani , Yoshikazu Kawabata , Yuji Hashimoto , Koji Suzuki , Kei Sakata , Makio Gunji , Akio Sato , Tetsuro Sawaki
发明人： Shunsuke Toyoda , Masatoshi Aratani , Yoshikazu Kawabata , Yuji Hashimoto , Koji Suzuki , Kei Sakata , Makio Gunji , Akio Sato , Tetsuro Sawaki
IPC分类号： C21D9/08 , C22C38/00 , C21D8/02
CPC分类号： B21C37/08 , C21D1/26 , C21D8/02 , C21D8/0226 , C21D8/0263 , C21D9/08 , C21D2211/005 , C22C38/02 , C22C38/04 , C22C38/12 , C22C38/14
摘要： A high-tensile strength welded steel tube has excellent formability and torsional fatigue endurance after being formed into cross-sectional shape and then stress-relief annealed. A steel material used has a composition which contains C, Si, Al, 1.01% to 1.99% Mn, 0.041% to 0.150% Ti, 0.017% to 0.150% Nb, P, S, N, and O such that the sum of the content of Ti and that of Nb is 0.08% or more, the content of each of C, Si, and Al being within an appropriate range, the content of each of P, S, N, and O being adjusted to a predetermined value or less.
摘要翻译：高强度焊接钢管在成形为截面形状后进行抗应力退火退火，具有优异的成型性和抗扭疲劳耐久性。使用的钢材具有含有C，Si，Al，1.01〜1.99％的Mn，0.041〜0.150％的Ti，0.017〜0.150％的Nb，P，S，N和O的成分， Ti和Nb的含量为0.08％以上，C，Si和Al中的每一种的含量在适当范围内，P，S，N和O中的每一个的含量被调节至预定值，或减。

5. 发明申请

US20070144632A1 Steel for structural part of automobile and method for producing the same 有权
标题翻译：汽车结构部件用钢及其制造方法
公开(公告)号：US20070144632A1
公开(公告)日：2007-06-28
申请号：US10582717
申请日：2004-12-09
申请人： Shunsuke Toyoda , Kei Sakata , Akio Sato , Koichi Kaneko , Hiroshi Kawaguchi
发明人： Shunsuke Toyoda , Kei Sakata , Akio Sato , Koichi Kaneko , Hiroshi Kawaguchi
IPC分类号： C22C38/32
CPC分类号： C22C38/02 , C21D8/0226 , C21D8/10 , C22C38/001 , C22C38/002 , C22C38/04 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/38
摘要： A steel having excellent formability, fatigue endurance after quenching, low temperature toughness, resistance for hydrogen embrittlement, and corrosion fatigue endurance. A method includes heating a steel slab at 1160° C. to 1320° C., hot-finish-rolling the steel slab at a finisher delivery temperature of 750° C. to 980° C., and then coiling the hot-rolled steel at a coiling temperature of 560° C. to 740° C. after slow cooling for a time of 2 seconds or more to produce a hot-rolled steel strip having a structure in which the ferrite grain diameter df corresponding to a circle is 1.1 μm to less than 1.2 μm and the ferrite volume fraction Vf is 30% to 98%, the steel slab containing 0.18 to 0.29% of C, 0.06 to 0.45% of Si, 0.91 to 1.85% of Mn, 0.019% or less of P, 0.0029% or less of S, 0.015 to 0.075% of sol. Al, 0.0049% or less of N, 0.0049% or less of O, 0.0001 to 0.0029% of B, 0.001 to 0.019% of Nb, 0.001 to 0.029% of Ti, 0.001 to 0.195% of Cr, and 0.001 to 0.195% of Mo so that the carbon equivalent Ceq satisfies a value of 0.4 to less than 0.58, and the total x of multiplying factors including that for B according to Grossmann satisfies a value of 1.2 to less than 1.7.
摘要翻译：具有优异的成形性，淬火后疲劳耐久性，低温韧性，耐氢脆性和耐腐蚀疲劳耐久性的钢。一种方法包括将钢坯在1160℃加热至1320℃，在750℃至980℃的整理器输送温度下对钢坯进行热精轧，然后卷取热轧钢在缓慢冷却2秒钟以上的卷取温度为560℃〜740℃的条件下，制造出具有如下结构的热轧带钢，其中铁素体晶粒直径df对应于圆形为1.1μm 小于1.2μm，铁素体体积分率Vf为30％〜98％，钢坯含有0.18〜0.29％的C，0.06〜0.45％的Si，0.91〜1.85％的Mn，0.019％以下的P， 0.0029％以下的S，0.015〜0.075％的溶胶。 Al：0.0049％以下，○0.0049％以下，B：0.0001〜0.0029％，Nb：0.001〜0.019％，Ti：0.001〜0.029％，Cr：0.001〜0.195％，以及0.001〜0.195％ Mo使得碳当量Ceq满足0.4至小于0.58的值，并且包括根据Grossmann的乘积因子的总和x满足1.2至小于1.7的值。

6. 发明授权

US06217680B1 Thick cold rolled steel sheet excellent in deep drawability and method of manufacturing the same 有权
标题翻译：厚拉伸性优良的厚冷轧钢板及其制造方法
公开(公告)号：US06217680B1
公开(公告)日：2001-04-17
申请号：US09254871
申请日：1999-03-15
申请人： Yoshikazu Kawabata , Kaneharu Okuda , Kei Sakata , Takashi Obara , Atsushi Ogino
发明人： Yoshikazu Kawabata , Kaneharu Okuda , Kei Sakata , Takashi Obara , Atsushi Ogino
IPC分类号： C21D804
CPC分类号： C21D8/0436 , C21D8/0426 , C21D8/0463 , C21D8/0473 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/60
摘要： A steel slab having a composition that comprises at most 0.008% by weight of C, at most 0.5% by weight of Si, at most 1.0% by weight of Mn, at most 0.15% by weight of P, at most 0.02% by weight of S, from 0.01 to 0.10% by weight of Al, at most 0.008% by weight of N, from 0.035 to 0.20% by weight of Ti, and from 0.001 to 0.015% by weight of Nb, with a balance of Fe and inevitable impurities, in which those C, S, N, Ti and Nb satisfy the following condition: 1.2(C/12+N/14+S/32)
摘要翻译：一种钢坯，其组成为：至多0.008重量％的C，至多0.5重量％的Si，至多1.0重量％的Mn，至多0.15重量％的P，至多0.02重量％的S，0.01〜0.10重量％的Al，至多0.008重量％的N，0.035〜0.20重量％的Ti和0.001〜0.015重量％的Nb，余量为Fe和不可避免的其中C，S，N，Ti和Nb满足以下条件的杂质：在钢的Ar 3相变点和Ar3相变点之间的温度下，进行粗热轧至不低于85％的压下率 950℃，然后在温度下降的温度下进行最终热轧至不低于65％的压下率。 600℃和Ar3相变点，同时被润滑，从而具有不大于0.06的平均剪切应变，然后酸洗，在700-920℃的温度下进行预退火，轧制至不低于65％的还原率，然后在700-920℃的温度下进一步退火再结晶。

7. 发明授权

US5542994A Method for manufacturing a high-formable, high-strength cold-rolled steel sheet excellent in resistance to secondary working embrittlement 失效
标题翻译：制造耐二次加工脆性优异的高成形，高强度冷轧钢板的方法
公开(公告)号：US5542994A
公开(公告)日：1996-08-06
申请号：US363365
申请日：1994-12-23
申请人： Kazuhiro Seto , Kaneharu Okuda , Kei Sakata , Toshiyuki Kato , Takashi Ono
发明人： Kazuhiro Seto , Kaneharu Okuda , Kei Sakata , Toshiyuki Kato , Takashi Ono
IPC分类号： C21D1/18 , C21D1/26 , C21D8/04 , C21D9/46 , C21D9/48 , C22C38/00 , C22C38/16 , C21D8/02
CPC分类号： C21D9/48 , C21D8/0426 , C21D1/185 , C21D1/26 , C21D2211/00 , C21D2211/005 , C21D8/0473
摘要： A method of producing a high-formable, high-strength cold-rolled steel sheet from a steel slab comprising a steel with very low carbon content, one or both of Ti and Nb as a composition for forming a carbide or a nitride, and B in the range satisfying the following expression:0.001 A.ltoreq.B (wt %).ltoreq.0.003 Awherein A is a parameter determined approximately by the following expression with reference to the relation:A=P (wt %)+0.2 Mn (wt %)+0.8 Si (wt %)-0.2, subjecting the steel to a hot rolling so as to finish at a temperature between about Ar.sub.3 transformation temperature and about Ar.sub.3 transformation temperature +100 C.degree.. Thereafter, the steel is successively subjected to coiling, cold-rolling and, then, continuous annealing at temperatures between Ac.sub.1 transformation temperature +5 C.degree. and Ac.sub.1 transformation temperature +50 C.degree., and not lower than 860 C.degree.. Thus, a volume percentage of a low temperature transformation phase is controlled within the range of about 5 to about 50%, thereby obtaining a high strength cold-rolled steel sheet having a tensile strength of 38 kgf/mm.sup.2 or more, plus excellent formability and resistance to secondary working embrittlement.
摘要翻译：作为用于形成碳化物或氮化物的组合物，由含有碳含量非常低的钢，Ti和Nb中的一种或两种的钢坯制造高成形性高强度冷轧钢板的方法，以及B 在满足以下表达式的范围内：0.001A

8. 发明申请

US20090202384A1 HIGH TENSILE STRENGTH HOT-ROLLED STEEL SHEET HAVING SUPERIOR STRAIN AGING HARDENABILITY AND METHOD FOR PRODUCING THE SAME 审中-公开
标题翻译：具有超级应变老化的高拉伸强度热轧钢板及其制造方法
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。

9. 发明申请

US20080230586A1 Method of Manufacturing Electric Resistance Welding Pipes Having Excellent Characterization of Welded Seams 有权
标题翻译：具有优良焊接接头特性的电阻焊管的制造方法
公开(公告)号：US20080230586A1
公开(公告)日：2008-09-25
申请号：US11992916
申请日：2006-11-09
申请人： Kazuhito Kenmochi , Takatoshi Okabe , Hiroyasu Yokoyama , Yuji Sugimoto , Yoshifumi Fujioka , Kei Sakata , Tomohiro Inoue , Hiroyuki Shirosawa , Motoaki Egi , Yasuo Nishida , Muneyoshi Murakami
发明人： Kazuhito Kenmochi , Takatoshi Okabe , Hiroyasu Yokoyama , Yuji Sugimoto , Yoshifumi Fujioka , Kei Sakata , Tomohiro Inoue , Hiroyuki Shirosawa , Motoaki Egi , Yasuo Nishida , Muneyoshi Murakami
IPC分类号： B21C37/083 , B23K13/00 , B23K101/06
CPC分类号： B21C37/0822 , B21C37/0826 , B21C37/083 , B23K31/12 , B23K2101/06
摘要： A method of efficiently manufacturing electric resistance welding pipes having excellent characterization of welded seams is provided, by which each lateral edge of a rounded strip immediately before electric resistance welding is securely shaped with desired tapering flexibly in response to change in strip thickness, so that welding quality may be kept to be excellent. A method of manufacturing electric resistance welding pipes, in which a strip is subjected to forming, then edges thereof are formed to substantially face each other, and then the edges are subjected to electric resistance welding to form a pipe, wherein an edge and an edge opposed thereto at one of an upper-surface side and a lower-surface side of the strip are shaped with tapering before the forming by means of cutting or shaving, or finpass forming.
摘要翻译：提供了一种有效地制造具有优异的焊缝表征的电阻焊接管的方法，通过该方法，在电阻焊接之前的圆形条的每个侧边缘根据条带厚度的变化灵活地成形为期望的锥形，从而焊接质量可能保持优异。一种制造电阻焊接管的方法，其中条带被成形，然后其边缘形成为基本相对，然后边缘进行电阻焊接以形成管，其中边缘和边缘在条带的上表面侧和下表面侧之一处与之形成相反的方式，在通过切割或刮削进行成形之前成形为锥形，或者是通过成形。

10. 发明申请

US20050019601A1 High-ductility steel sheet excellent in press formability and strain age hardenability, and method for manufacturing the same 审中-公开
标题翻译：压制成形性和应变时效淬透性优异的高延展性钢板及其制造方法
公开(公告)号：US20050019601A1
公开(公告)日：2005-01-27
申请号：US10909049
申请日：2004-07-30
申请人： Saiji Matsuoka , Tetsuo Shimizu , Kei Sakata , Osamu Furukimi
发明人： Saiji Matsuoka , Tetsuo Shimizu , Kei Sakata , Osamu Furukimi
IPC分类号： C22C38/00 , C21D8/02 , C22C38/02 , C22C38/04 , C22C38/12 , C22C38/16 , C23C2/02 , C23C2/28 , B32B15/00
CPC分类号： C22C38/02 , C21D8/0226 , C21D8/0236 , C21D8/0273 , C21D8/0278 , C22C38/04 , C22C38/12 , C22C38/16 , C23C2/02 , C23C2/28 , Y10T428/12799
摘要： A steel sheet composition contains appropriate amounts of C, Si, Mn, P, S, Al and N and 0.5 to 3.0% Cu. A composite structure of the steel sheet has a ferrite phase or a ferrite phase and a tempered martensite phase as a primary phase, and a secondary phase containing retained austenite in a volume ratio of not less than 1%. In place of the Cu, at least one of Mo, Cr, and W may be contained in a total amount of not more than 2.0%. This composition is useful in production of a high-ductility hot-rolled steel sheet, a high-ductility cold-rolled steel sheet and a high-ductility hot-dip galvanized steel sheet having excellent press formability and excellent stain age hardenability as represented by a ΔTS of not less than 80 MPa, in which the tensile strength increases remarkably through a heat treatment at a relatively low temperature after press forming.
摘要翻译：钢板组合物含有适量的C，Si，Mn，P，S，Al和N以及0.5〜3.0％的Cu。钢板的复合结构具有铁素体相或铁素体相，回火马氏体相作为主相，第二相含有体积比为1％以上的残留奥氏体。代替Cu，Mo，Cr和W中的至少一种可以含有不超过2.0％的总量。该组合物可用于生产高延展性热轧钢板，高延展性冷轧钢板和高延展性热浸镀锌钢板，其具有优异的压制成形性和优异的耐老化淬透性，如通过压制成形后的较低温度下的热处理，拉伸强度不大于80MPa的ΔTS值。

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