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。

公开(公告)号：US07101445B2

公开(公告)日：2006-09-05

申请号：US10654775

申请日：2003-09-04

申请人： Chikara Kami ,  Akio Tosaka ,  Takuya Yamazaki

发明人： Chikara Kami ,  Akio Tosaka ,  Takuya Yamazaki

IPC分类号： C22C38/06 ,  C22C38/02 ,  C22C38/04

CPC分类号： C21D8/0436 ,  C21D1/185 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D8/0426 ,  C21D8/0473 ,  C21D9/46 ,  C21D9/48 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  Y10T428/12493 ,  Y10T428/12799

摘要： An object of the present invention is to provide a cold-rolled steel sheet and an alloyed hot-dip galvanized steel sheet in which tensile strength is effectively increased by press forming and heat treatment while maintaining excellent deep drawability in press forming. Specifically, a steel composition contains less than 0.01% of C, 0.005 to 1.0% of Si, 0.01 to 1.0% of Mn, 0.005 to 0.050% of Nb, 0.005 to 0.030% of Al, 0.005 to 0.040% of N, 0.0005 to 0.0015% of B, 0.05% or less of P, and 0.01% or less of S, the balance substantially composed of Fe, in which the following equations (1) and (2) are satisfied: N %≧0.0015+14/93·Nb %+14/27·Al %+14/11·B %  (1) C %≦(12/93)·Nb %.  (2)

摘要翻译： 本发明的目的是提供一种冷压钢板和合金化的热浸镀锌钢板，其中通过冲压成形和热处理有效地提高了拉伸强度，同时保持了冲压成形时的优异的深冲性。 具体地说，钢组成包含C：0.01％以下，Si：0.005〜1.0％，Mn：0.01〜1.0％，Nb：0.005〜0.050％，Al：0.005〜0.030％，N：0.005〜0.040％ 0.0015％的B，0.05％以下的P和0.01％以下的S，余量基本上由Fe组成，其中满足以下等式（1）和（2）：<？在线公式描述 =“在线公式”end =“lead”？> N％> = 0.0015 + 14 / 93.Nb％+ 14 / 27.Al％+ 14 / 11.B％（1）<？ description =“In-line Formulas”end =“tail”？> <？in-line-formula description =“In-line Formulas”end =“lead”？> C％<=（12/93）.Nb％。 （2）<？in-line-formula description =“In-line Formulas”end =“tail”？>

公开(公告)号：US07067023B2

公开(公告)日：2006-06-27

申请号：US10655361

申请日：2003-09-04

申请人： Chikara Kami ,  Akio Tosaka ,  Takuya Yamazaki

发明人： Chikara Kami ,  Akio Tosaka ,  Takuya Yamazaki

IPC分类号： C21D8/02

CPC分类号： C21D8/0436 ,  C21D1/185 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D8/0426 ,  C21D8/0473 ,  C21D9/46 ,  C21D9/48 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  Y10T428/12493 ,  Y10T428/12799

摘要： An object of the present invention is to provide a cold-rolled steel sheet and an alloyed hot-dip galvanized steel sheet in which tensile strength is effectively increased by press forming and heat treatment while maintaining excellent deep drawability in press forming. Specifically, a steel composition contains less than 0.01% of C, 0.005 to 1.0% of Si, 0.01 to 1.0% of Mn, 0.005 to 0.050% of Nb, 0.005 to 0.030% of Al, 0.005 to 0.040% of N, 0.0005 to 0.0015% of B, 0.05% or less of P, and 0.01% or less of S, the balance substantially composed of Fe, in which the following equations (1) and (2) are satisfied: N%≧0.0015+14/93.Nb%+14/27.Al%+14/11.B%  (1) C%≧(12/93).Nb%  (2)

摘要翻译： 本发明的目的是提供一种冷压钢板和合金化的热浸镀锌钢板，其中通过冲压成形和热处理有效地提高了拉伸强度，同时保持了冲压成形时的优异的深冲性。 具体地说，钢组成包含C：0.01％以下，Si：0.005〜1.0％，Mn：0.01〜1.0％，Nb：0.005〜0.050％，Al：0.005〜0.030％，N：0.005〜0.040％ 0.0015％的B，0.05％以下的P和0.01％以下的S，余量基本上由Fe组成，其中满足以下等式（1）和（2）：<？在线公式描述 =“在线公式”end =“lead”？> N％> = 0.0015 + 14 / 93.Nb％+ 14 / 27.Al％+ 14 / 11.B％（1）<？ 描述=“内联公式”end =“tail”？> <？in-line-formula description =“In-line formula”end =“lead”？> C％> =（12/93）.Nb％ 2）<？in-line-formula description =“In-line Formulas”end =“tail”？>

公开(公告)号：US5725697A

公开(公告)日：1998-03-10

申请号：US360348

申请日：1994-12-21

申请人： Chikako Fujinaga ,  Akio Tosaka ,  Toshiyuki Kato ,  Kaku Sato ,  Hideo Kuguminato

发明人： Chikako Fujinaga ,  Akio Tosaka ,  Toshiyuki Kato ,  Kaku Sato ,  Hideo Kuguminato

IPC分类号： C21D8/04 ,  C22C38/12

CPC分类号： C22C38/12 ,  C21D8/0436 ,  C21D8/0426 ,  C21D8/0468

摘要： A method of manufacturing a cold-rolled can steel sheet having less planar anisotropy and achieving good workability. Rough-rolling is first performed on a continuously-cast slab. The slab has a composition essentially consisting of: C: 0.004 wt % or lower; Mn: 0.05-0.5 wt %; P: 0.02 wt % or lower; Al: 0.005-0.07 wt %; N: 0.004 wt % or lower; and Nb: 0.001-0.018 wt %, the rest being Fe and unavoidable impurities. A resultant sheet bar is then subjected to hot rolling which is completed at a finishing rolling temperature at an Ar.sub.3 transformation point or higher. The resultant sheet bar is coiled at a temperature range from 450.degree.-700.degree. C. Subsequently, the resultant sheet bar undergoes primary cold rolling before continuous annealing, which is performed at a recrystallization temperature or higher, and secondary cold rolling. The primary and secondary cold rolling are respectively performed at reduction ratios satisfying the following conditions of: 88%.gtoreq.CR.sub.1 %+0.36.times.CR.sub.2 .ltoreq.105% wherein CR.sub.1 : reduction ratio of the primary cold rolling CR.sub.2 : reduction ratio of the secondary cold rolling

摘要翻译： 制造平面各向异性小的冷轧钢板的制造方法，加工性良好。 首先在连续铸造的板坯上进行粗轧。 板坯的组成基本上由以下组成：C：0.004重量％以下; Mn：0.05〜0.5重量％ P：0.02重量％以下; Al：0.005-0.07重量％ N：0.004重量％以下; 和Nb：0.001-0.018重量％，其余为Fe和不可避免的杂质。 然后对得到的薄板坯进行在Ar3相变点以上的精轧条件下完成的热轧。 所得板坯在450〜-90℃的温度范围内卷绕。接着，在再结晶温度以上进行二次冷轧，连续退火前进行一次冷轧。 一次冷轧和二次冷轧分别以满足以下条件的压下率进行：88％> = CR1％+ 0.36×CR2 <105％其中CR1：二次冷轧CR2的减速比：次级 冷轧

公开(公告)号：US4931106A

公开(公告)日：1990-06-05

申请号：US241386

申请日：1988-09-07

申请人： Akio Tosaka ,  Kei Sakata ,  Koichi Hashiguchi ,  Tateo Higashino ,  Toshio Ichida

发明人： Akio Tosaka ,  Kei Sakata ,  Koichi Hashiguchi ,  Tateo Higashino ,  Toshio Ichida

IPC分类号： C21D8/04 ,  C22C38/14

CPC分类号： C22C38/14 ,  C21D8/0426

摘要： A hot rolled steel sheet having a specific composition and having a specific small grain size of ferrite constituting the steel sheet has high resistances against secondary-work embrittlement and brazing embrittlement and is adapted for ultra-deep drawing. The specific small grain size of the ferrite can be obtained by limiting the hot rolling condition of a slab having the specific composition.

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：US06702904B2

公开(公告)日：2004-03-09

申请号：US09980513

申请日：2001-10-24

申请人： Chikara Kami ,  Akio Tosaka ,  Kazunori Osawa ,  Shinjiro Kaneko ,  Takuya Yamazaki ,  Kaneharu Okuda ,  Takashi Ishikawa

发明人： Chikara Kami ,  Akio Tosaka ,  Kazunori Osawa ,  Shinjiro Kaneko ,  Takuya Yamazaki ,  Kaneharu Okuda ,  Takashi Ishikawa

IPC分类号： C22C3804

CPC分类号： C21D8/0236 ,  C21D8/0226 ,  C21D8/0268 ,  C21D8/0273 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/22 ,  C22C38/38

摘要： The present invention presents a high tensile strength cold rolled steel sheet having excellent formability, impact resistance and strain age hardening characteristics, and the production thereof. As a specific means, a slab having a composition which contains, by mass %, 0.15% or less of C, 0.02% or less of Al, and 0.0050 to 0.0250% of N at N/Al of 0.3 or higher, and has N in a solid solution state at 0.0010% or more, is first hot rolled at the finish rolling delivery-side temperature of 800° C. or above, and is subsequently coiled at the coiling temperature of 750° C. or below to prepare a hot rolled plate. Then, after cold rolling, the hot rolled plate is continuously cooled at a temperature from the recrystallization temperature to 900° C. at a holding time of 10 to 120 seconds, and is cooled by primary cooling in which the hot rolled plate is cooled to 500° C. or below at a cooling rate of 10 to 300° C./s, and furthermore if necessary, by secondary cooling in which a residence time is 300 seconds or less in a temperature range of the primary cooling stopping temperature or below and 350° C. or higher. Provided is a steel sheet containing a ferritic phase having an average crystal grain size of 10 &mgr;m or less at an area ratio of 50% or more, and if necessary, a martensitic phase at an area ratio of 3% or more as a second phase.

摘要翻译： 本发明提供一种成型性，耐冲击性和应变时效硬化特性优异的高拉伸强度的冷轧钢板及其制造方法。 作为具体的方法，具有以质量％计含有0.15％以下C，0.02％以下Al，N / Al为0.0050〜0.0250％N，0.3以上N组成的板坯， 在0.0010％以上的固溶状态下，首先在800℃以上的精轧条件下进行热轧，然后在卷取温度为750℃以下的条件下卷取，制成热 轧板。 然后，冷轧后，在10〜120秒的保持时间内，从再结晶温度至900℃的温度下连续冷却热轧板，通过一次冷却冷却，将热轧板冷却至 500℃以下，冷却速度为10〜300℃/秒，另外如果需要，通过在一次冷却停止温度以下的温度范围内停留时间为300秒以下的二次冷却 和350℃以上。 本发明提供一种钢板，其含有平均结晶粒径为10μm以下的面积比为50％以上的铁素体相，根据需要，作为第二相的面积比为3％以上的马氏体相 。

公开(公告)号：US06695932B2

公开(公告)日：2004-02-24

申请号：US10031742

申请日：2002-01-23

申请人： Chikara Kami ,  Akio Tosaka

发明人： Chikara Kami ,  Akio Tosaka

IPC分类号： C22C3806

CPC分类号： C22C38/001 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0242 ,  C21D8/0273 ,  C21D9/52 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/04 ,  C22C38/06 ,  Y02P10/212

摘要： The present invention provides a cold-rolled sheet exhibiting superior strain-aging hardenability which is suitable for use in automobile bodies, and a method for manufacturing the same. In particular, a slab including, by mass, not more than 0.15% carbon, not more than 0.02% Al, and 0.0050% to 0.0250% nitrogen in which Si+Mn/5+10P is adjusted to less than 0.44 and the ratio N/Al is adjusted to not less than 0.3 is hot-rolled at a finish-rolling delivery temperature FDT of not less than 800° C., and then coiled at a temperature of not more than 650° C. Next, after cold-rolling, continuous-annealing at a temperature between the recrystallization temperature and 950° C., primary cooling for cooling to a temperature zone of not more than 500° C., and overaging in the temperature zone of 350° C. to 450° C. for a retention time of not more than 30 seconds are performed to prepare a steel sheet containing not less than 0.0010% of solute nitrogen and having a structure in which the ferrite phase with the grain size of not more than 15 &mgr;m is included at a ratio of not less than 90%, the remainder of the structure being the pearlite phase. The resulting steel sheet has superior strain-aging hardenability in which the tensile strength is less than 440 MPa and the yield ratio is less than 70%.

摘要翻译： 本发明提供一种适用于汽车车身的具有优异的应变时效淬透性的冷轧板及其制造方法。 特别是，将Si + Mn / 5 + 10P调整为小于0.44的氮含量不超过0.15％，不大于0.02％Al和0.0050％〜0.0250％的氮的板坯，N / Al调整为0.3以上，在不低于800℃的精轧轧制温度FDT下进行热轧，然后在不高于650℃的温度下卷绕。接下来，冷轧后 在再结晶温度和950℃之间的温度下进行连续退火，一次冷却冷却至不高于500℃的温度区域，在350℃至450℃的温度范围内进行过时效应。 进行保持时间不超过30秒，以制备含有不少于0.0010％的固溶氮的钢板，并且具有其中包含不超过15μm的晶粒尺寸的铁素体相的结构 不小于90％，其余的结构是珠光体相。 得到的钢板具有优异的拉伸强度小于440MPa并且屈服比小于70％的应变时效淬透性。

公开(公告)号：US06398884B1

公开(公告)日：2002-06-04

申请号：US09673626

申请日：2000-10-19

申请人： Kazuaki Kyono ,  Shigeru Umino ,  Akio Tosaka ,  Keiji Nishimura ,  Hiromasa Hayashi

发明人： Kazuaki Kyono ,  Shigeru Umino ,  Akio Tosaka ,  Keiji Nishimura ,  Hiromasa Hayashi

IPC分类号： C21D802

CPC分类号： C22C38/06 ,  C21D8/04 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0463 ,  C21D8/0473 ,  C21D8/0478 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  C22C38/60 ,  C23C2/02

摘要： This invention can form a sufficiently internal oxide layer in a surface layer portion of an iron matrix of a steel sheet by hot rolling a base steel and subjecting to a heat treatment at a temperature range of 650-950° C. in an atmosphere substantially not causing reduction while being adhered with a black skin scale irrespectively of a chemical steel composition or production history, or even when a radiation type heating of a radial tube or the like is used in a recrystallization annealing before a hot dipping treatment, and hence excellent hot-dipping property and conversion treating property can be given to a steel sheet for hot dipping.

摘要翻译： 本发明可以在钢板的铁基体的表层部分中形成足够内部的氧化物层，其通过热轧基体钢并在基本上不是的气氛中在650-950℃的温度范围内进行热处理 在与化学钢组成或生产历史无关地附着黑色皮肤鳞片的同时，甚至在热浸镀处理之前的再结晶退火中使用径向管等的放射线加热时，会导致降低，因此优异的热 浸渍性能和转化处理性能可以用于热浸镀钢板。

公开(公告)号：US06290784B1

公开(公告)日：2001-09-18

申请号：US09427270

申请日：1999-10-26

申请人： Eiko Yasuhara ,  Akio Tosaka ,  Osamu Furukimi

发明人： Eiko Yasuhara ,  Akio Tosaka ,  Osamu Furukimi

IPC分类号： C22C3814

CPC分类号： C22C38/14 ,  B21B1/26 ,  B21B27/106 ,  B21B45/004 ,  C21D8/0226 ,  C22C38/002 ,  C22C38/04

摘要： A hot rolled steel sheet comprises ultrafine ferrite grains as a main phase and fine second phase particles. The ferrite grains have an average grain size of not less than 2 &mgr;m but less than 4 &mgr;m. The second phase has an average particle size of not more than 8 &mgr;m and in not less than 80% of the second phase, the spacing of the second phase particle with the closest second phase particle is not less than the second phase particle size. The steel sheet has an ultrafine grain structure, superior mechanical characteristics, reduced anisotropy in its mechanical characteristics and high formability. A process for producing the steel sheet is also disclosed.

摘要翻译： 热轧钢板包括作为主相的超细铁素体晶粒和微细的第二相粒子。 铁素体晶粒的平均粒径不小于2μm但小于4μm。 第二相的平均粒径不大于8μm，在第二相的80％以上，第二相粒子与最接近的第二相粒子的间隔不小于第二相粒径。 钢板具有超细晶粒结构，机械特性优异，机械特性降低各向异性，成形性高。 还公开了一种钢板的制造方法。