公开(公告)号：US5356494A

公开(公告)日：1994-10-18

申请号：US874306

申请日：1992-04-24

申请人： Susumu Okada ,  Kei Sakata ,  Susumu Satoh ,  Masahiko Morita ,  Toshiyuki Kato

发明人： Susumu Okada ,  Kei Sakata ,  Susumu Satoh ,  Masahiko Morita ,  Toshiyuki Kato

IPC分类号： C21D1/18 ,  C21D8/04 ,  C22C38/12

CPC分类号： C22C38/12 ,  C21D8/0473 ,  C21D1/185 ,  C21D2211/00 ,  C21D2211/002 ,  C21D2211/005 ,  C21D8/0436

摘要： The invention relates to a high strength cold rolled steel sheet having excellent non-aging property at room temperature and excellent drawability, said steel sheet having a dual-phase structure composed of a high-temperature transformed ferrite phase and a low-temperature transformed ferrite phase having high dislocation density.The invention also relates a high strength cold rolled steel sheet having excellent non-aging property at room temperature and bake hardenability, as well as excellent drawability. This steel sheet is produced by preparing a hot-rolled steel sheet, cold rolling the hot-rolled steel sheet at a rolling reduction not smaller than 60%, annealing the cold rolled steel sheet at a temperature which is not lower than the .gamma. transformation start temperature but below the A.sub.c3 transformation temperature, and cooling the annealed steel sheet at a rate not smaller than 5.degree. C./sec but not greater than 100.degree. C./sec.

摘要翻译： 本发明涉及一种在室温下具有优异的非时效性和优异的拉伸性的高强度冷轧钢板，所述钢板具有由高温转化的铁素体相和低温转变的铁素体相组成的双相结构 具有高位错密度。 本发明还涉及在室温下具有优异的非时效性和烘烤淬透性以及优异的可拉伸性的高强度冷轧钢板。 该钢板通过制备热轧钢板，以不低于60％的压延率将热轧钢板进行冷轧，在不低于γ转变开始的温度下退火冷轧钢板 温度但低于Ac3转变温度，并且以不低于5℃/秒但不大于100℃/秒的速率冷却退火的钢板。

公开(公告)号：US5290370A

公开(公告)日：1994-03-01

申请号：US931066

申请日：1992-08-17

申请人： Susumu Okada ,  Susumu Masui ,  Susumu Satoh ,  Kei Sakata ,  Masahiko Morita ,  Toshiyuki Kato

发明人： Susumu Okada ,  Susumu Masui ,  Susumu Satoh ,  Kei Sakata ,  Masahiko Morita ,  Toshiyuki Kato

IPC分类号： C21D8/04 ,  C22C38/04 ,  C22C38/12

CPC分类号： C22C38/04 ,  C21D8/0426 ,  C22C38/12 ,  C21D8/0436 ,  C21D8/0473

摘要： A high-tension steel sheet suitable for deep drawing and having superior surface treatment characteristics is made of a steel consisting essentially of, by weight: 0.001 to 0.05% of C; not more than 1.0% of Si; not more than 2.5% of Mn; 0.05 to 1.0% of Mo; one or both of 0.001 to 0.2% of Nb and not more than 0.3% of Ti, wherein Ti*%+(48/93)Nb%.gtoreq.(48/12)C% in which Ti*%=Ti%-(48/32) S%-(48/14)N%, wherein, when Ti*%

摘要翻译： 适用于深拉伸且具有优异表面处理特性的高强度钢板由基本上由以重量计0.001％至0.05％C的钢制成; 不超过1.0％的Si; 不超过2.5％的Mn; 0.05〜1.0％的Mo; 其中Ti *％+（48/93）Nb％> =（48/12）C％中Ti = 0.001〜0.2％，Ti为0.3％以下，Ti *％= Ti％ 48/32）S％ - （48/14）N％，其中，当Ti *％<0时，Ti *％被认为是0; 0.0005〜0.01％B; 0.01〜0.10％的Al; 不超过0.15％的P; 不超过S的0.010％; 不大于0.006％的N; Si，Mn和P满足0.2 <（Si％+ 10P％）/ Mn％<3.3的条件; 余量基本上是Fe和杂质。 该钢板是通过以下工序制造的：将钢坯进行热轧，得到不低于Ar 3转变温度的最终热轧温度的热轧钢带; 在不含有Nb的情况下，在不低于300℃但不高于615℃的温度下卷取钢带，并且当含有Nb时不低于500℃，但不高于700℃; 对钢带进行冷轧，得到轧制压下率不低于65％的冷轧钢带; 在不低于再结晶温度但低于Ac3转变温度的温度下对冷轧带材进行再结晶退火。

公开(公告)号：US5372654A

公开(公告)日：1994-12-13

申请号：US122357

申请日：1993-09-17

申请人： Susumu Satoh ,  Susumu Okada ,  Kouichi Hirata ,  Masahiko Morita ,  Tsuguhiko Nakagawa

发明人： Susumu Satoh ,  Susumu Okada ,  Kouichi Hirata ,  Masahiko Morita ,  Tsuguhiko Nakagawa

IPC分类号： C21D8/04 ,  C22C38/00 ,  C22C38/60 ,  C23C8/34 ,  C21D1/06

CPC分类号： C23C8/34 ,  C21D8/0457 ,  C22C38/001 ,  C21D2201/05 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0473

摘要： The present invention provides a steel sheet for press working that exhibits excellent stiffness and satisfactory press workability. The steel sheet for press working includes: a composition of C+N+B=0.007 to 1.0 wt % in a region from the surface of the steel sheet to a position of 5% of the thickness in a direction of the thickness in at least either of the surface layers; a pole intensity of [{321}+{211}]/{100}.gtoreq.1.2 in a vertical direction to the sheet surface realized at a 3% thickness position in the direction of the thickness from the surface; and a composition of C+N+B=0.010 wt % less than in the central portion 40% except for two 30% portions of the two surface layers in the direction of the thickness.

摘要翻译： 本发明提供一种显示出优异的刚性和令人满意的冲压加工性的冲压加工用钢板。 用于冲压加工的钢板包括：在从钢板表面到至少厚度方向的厚度的5％的位置中，C + N + B = 0.007至1.0重量％的组合物至少 任何表面层; 在距离表面厚度方向的3％厚度位置实现的板材表面垂直方向的[{321} + {211}] / {100}> / = 1.2的极强度; 并且除了在两个表面层的厚度方向上的两个30％的部分之外，C + N + B的组成比在中心部分40％小0.010重量％。

公开(公告)号：US5156694A

公开(公告)日：1992-10-20

申请号：US696683

申请日：1991-05-07

申请人： Yoshio Yamazaki ,  Susumu Okada ,  Susumu Satoh ,  Toshiyuki Kato ,  Hideo Abe ,  Keiji Nishimura

发明人： Yoshio Yamazaki ,  Susumu Okada ,  Susumu Satoh ,  Toshiyuki Kato ,  Hideo Abe ,  Keiji Nishimura

IPC分类号： C21D8/04 ,  C22C38/00

CPC分类号： C22C38/00 ,  C21D8/04 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0473 ,  C21D8/0478

摘要： A formable thin steel sheet such as hot rolled sheet, cold rolled sheet or surface treated sheet comprises not more than 0.003 wt % of C, not more than 1.0 wt % of Si, not more than 1.0 wt % of Mn, not more than 0.15 wt % of P, not more than 0.020 wt % of S, not more than 0.0045 wt % of O, not more than 0.0020 wt % of N, not more than 0.15 wt % of Al provided that a ratio of Al/N is not less than 30, and the balance being Fe and inevitable impurities, and has not only improved formability for press forming, deep drawing or the like but also improved fatigue resistance as a welded joint.

摘要翻译： 热轧板，冷轧板或表面处理片等成形薄钢板不超过0.003重量％的C，不大于1.0重量％的Si，不大于1.0重量％的Mn，不大于0.15 重量％的P，不大于0.020重量％的S，不大于0.0045重量％的O，不大于0.0020重量％的N，不大于Al的0.15重量％，只要Al / N的比率不是 小于30，余量为Fe和不可避免的杂质，不仅提高了冲压加工成形性，深冲压加工性，还提高了作为焊接接头的耐疲劳性。

公开(公告)号：US5053194A

公开(公告)日：1991-10-01

申请号：US449724

申请日：1989-12-12

申请人： Yoshio Yamazaki ,  Susumu Okada ,  Susumu Satoh ,  Toshiyuki Kato ,  Hideo Abe ,  Keiji Nishimura

发明人： Yoshio Yamazaki ,  Susumu Okada ,  Susumu Satoh ,  Toshiyuki Kato ,  Hideo Abe ,  Keiji Nishimura

IPC分类号： C21D8/04 ,  C22C38/00

CPC分类号： C22C38/00 ,  C21D8/04 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0473 ,  C21D8/0478

摘要： A formable thin steel sheet such as hot rolled sheet, cold rolled sheet or surface treated sheet comprises not more than 0.003 wt. % of C, not more than 1.0 wt % of Si, not more than 1.0 wt % of Mn, not more than 0.15 wt % of P, not more than 0.020 wt % of S, not more than 0.0045 wt % of O, not more than 0.0020 wt % of N, not more than 0.15 wt % of Al provided that a ratio of Al/N is not less than 30, and the balance being Fe and inevitable impurities, and has not only improved formability for press forming, deep drawing or the like but also improved fatigue resistance as a welded joint.

公开(公告)号：US5279683A

公开(公告)日：1994-01-18

申请号：US891685

申请日：1992-05-29

申请人： Susumu Okada ,  Tojiro Ikeda ,  Susumu Satoh ,  Hideo Abe ,  Jun-ichi Mano ,  Norio Ohta

发明人： Susumu Okada ,  Tojiro Ikeda ,  Susumu Satoh ,  Hideo Abe ,  Jun-ichi Mano ,  Norio Ohta

IPC分类号： C21D8/04

CPC分类号： C21D8/0431 ,  C21D8/0436

摘要： A method of producing a high-strength cold-rolled steel sheet suitable for working uses which utilizes a steel material having the following composition: not more than 0.006 wt % of C, not more than 0.5 wt % of Si, not more than 2.0 wt % of Mn, and not less than 0.01 wt % but not more than 0.10 wt % of Ti, the Ti, C and N contents being determined to meet the condition of Ti>(48/12) C wt %+(48/14) N wt %, the steel also consisting essentially of not less than 0.0010 wt % but not more than 0.0100 wt % of Nb, not less than 0.0002 wt % but not more than 0.0020 wt % of B, not less than 0.03 wt % but not more than 0.20 wt % of P, not more than 0.03 wt % of S, not less than 0.010 wt % but not more than 0.100 wt % of Al, not more than 0.008 wt % of N, not more than 0.0045 wt % of O, and the balance substantially Fe and incidental inclusions. The steel material is cast and hot-rolled and then subjected to a cold rolling conducted at a sheet temperature not higher than 300.degree. C. under such a condition that the sum of the rolling reductions of passes which meet the following condition between said sheet temperature (T .degree.C.) and the strain rate .epsilon. (S-1) is 50% or greater:T.times..epsilon..gtoreq.50,000.degree. C. S.sup.-1The steel sheet is then continuously annealed or galvannealed.

摘要翻译： 一种适用于使用具有以下组成的钢材的工作用高强度冷轧钢板的方法：不超过0.006重量％的C，不大于0.5重量％的Si，不大于2.0重量％ Mn，不小于0.01重量％，但不超过0.10重量％，Ti，C和N含量被确定为满足Ti>（48/12）C wt％+（48/14）的条件 ）N重量％时，钢还基本上由不少于0.0010重量％但不大于0.0100重量％的Nb组成，不小于0.0002重量％但不大于0.0020重量％的B，不小于0.03重量％，但是 不超过0.20重量％的P，不大于0.03重量％的S，不小于Al的0.010重量％但不大于0.100重量％，不大于0.008重量％的N，不大于0.0045重量％的 O，余量基本上是Fe和附带的夹杂物。 将钢材进行铸造和热轧，然后在不高于300℃的板材温度下进行冷轧，条件是在所述板温度之间满足以下条件的轧制轧制量的总和 （T°C），应变速率（ε）（S-1）为50％以上：T *（ε）> = 50,000℃S-1然后对钢板进行连续退火或合金化热浸镀锌。

公开(公告)号：US6074493A

公开(公告)日：2000-06-13

申请号：US713189

申请日：1996-09-12

申请人： Tsuguhiko Nakagawa ,  Koushi Kuramoto ,  Nobuaki Hanazono ,  Jun Morozumi ,  Susumu Satoh ,  Susumu Okada

发明人： Tsuguhiko Nakagawa ,  Koushi Kuramoto ,  Nobuaki Hanazono ,  Jun Morozumi ,  Susumu Satoh ,  Susumu Okada

IPC分类号： C21D1/19 ,  C21D9/00 ,  C23C8/22 ,  C23C8/20 ,  C21D1/54

CPC分类号： C21D9/0062 ,  C21D1/19 ,  C23C8/22

摘要： This invention aims at providing a method of continuously carburizing a metal strip, which is capable of providing industrially optimum carburization conditions while attaining non-soot-generating atmospheric data, desired carburization concentration distribution and desired carburization rate, in a case where a strip passed through a carburization furnace is carburized continuously in a surface reaction rate-governing area in which the carbon concentration in a superficial layer of the strip has not yet reached an equilibruim level with respect to the time. The method consist of carburization concentration distribution (S7), on the basis of the carburization conditions including given specification data for the steel plate, furnace temperature and composition of the atmospheric gas, outputting the concentration of the components of the atmospheric gas, feed and discharge rates and other carburization conditions when the set carburization rate and an actual carburization rate are equal (S8-S15), and correcting the set carburization rate when a difference between the set carburization rate and an actual carburization rate is large, and correcting the strip feed rate while correcting the composition of the atmospheric gas when a difference between the predetermined carburization rate and set carburization rate is large (S9).

摘要翻译： 本发明的目的在于提供一种连续渗碳金属带的方法，该方法能够在条带通过的情况下获得工业上最佳的渗碳条件，同时获得产生非烟灰的大气数据，所需的渗碳浓度分布和所需的渗碳速率 渗碳炉在表面反应速率控制区域中连续渗碳，其中带材的表面层中的碳浓度相对于时间尚未达到平衡水平。 该方法包括渗碳浓度分布（S7），基于包括给出的钢板规格数据，炉温和气氛气体组成的渗碳条件，输出大气气体成分浓度，进料和排出 当设定的渗碳速率和实际渗碳速率相等时（S8-S15），并且当设定的渗碳速率和实际渗碳速率之间的差异大时校正设定的渗碳速率，并且校正带材进料 当预定的渗碳速率和设定的渗碳速率之间的差异大时，校正气氛气体的组成的速率（S9）。

公开(公告)号：US06221179B1

公开(公告)日：2001-04-24

申请号：US09297818

申请日：1999-06-22

申请人： Eiko Yasuhara ,  Masahiko Morita ,  Osamu Furukimi ,  Susumu Okada

发明人： Eiko Yasuhara ,  Masahiko Morita ,  Osamu Furukimi ,  Susumu Okada

IPC分类号： C22C3800

CPC分类号： C21D8/0226 ,  C21D2201/00 ,  C21D2211/005

摘要： A hot rolled steel sheet with improved formability and producing method therefor, which can be easily produced with general hot strip mills, having less anisotropy of mechanical properties and final ferrite grain diameter of less than 2 &mgr;m that could not be achieved by the prior art. The hot rolled steel sheet comprises a ferrite phase as a primary phase, and has an average ferrite grain diameter of less than 2 &mgr;m, with the ferrite grains having an aspect ratio of less than 1.5. The hot rolled steel sheet is obtained by carried out a reduction process under a dynamic recrystallization conditions through reduction passes of not less than 5 stands in the hot finish rolling.

摘要翻译： 一种具有改进成形性的热轧钢板及其制造方法，其可以容易地用通常的热轧带钢轧机制造，其具有较小的机械性能的各向异性和小于2μm的最终铁素体晶粒直径，这是现有技术无法实现的。 热轧钢板以铁素体相为主相，平均铁素体晶粒直径小于2μm，铁素体晶粒的纵横比小于1.5。 热轧钢板是通过在热精轧中通过不少于5台的还原通过在动态再结晶条件下进行还原处理而得到的。

公开(公告)号：US5948183A

公开(公告)日：1999-09-07

申请号：US947388

申请日：1997-10-08

申请人： Susumu Okada ,  Masahiko Morita ,  Fumimaru Kawabata

发明人： Susumu Okada ,  Masahiko Morita ,  Fumimaru Kawabata

IPC分类号： C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14

CPC分类号： C22C38/04 ,  C21D8/0226 ,  C22C38/02 ,  C22C38/12 ,  C22C38/14 ,  C21D2211/002 ,  C21D2211/005

摘要： The present invention provides a hot-rolled steel sheet having a low yield ratio, a high specific strength, and excellent toughness. The hot-rolled steel sheet comprises: 0.005 to less than 0.030 weight percent of carbon, 1.5 weight percent or less of silicon, 1.5 weight percent or less of manganese, 0.020 weight percent or less of phosphorus, 0.015 weight percent or less of sulfur, 0.005 to 0.10 weight percent of aluminum, 0.0100 weight percent or less of nitrogen, 0.0002 to 0.0100 weight percent of boron, at least one element selected from the group consisting of 0.20 weight percent or less of titanium and 0.25 weight percent or less of niobium in an amount to satisfy (Ti+Nb/2)/C.gtoreq.4, and balance iron and incidental impurities. The metal structure is selected from the group consisting of ferrite and bainitic ferrite. The amount of carbon dissolved in grains ranges from 1.0 to 4.0 ppm. The present invention also provides a method for producing a hot-rolled steel sheet. The method includes hot-rolling a steel slab containing the above components, cooling at a rate of between 5 to not more than 20.degree. C./sec., and then coiling at a temperature ranging from over 550.degree. C. to 700.degree. C.

摘要翻译： 本发明提供一种低屈服比，高比强度，优异的韧性的热轧钢板。 该热轧钢板包括：0.005〜小于0.030重量％的碳，1.5重量％以下的硅，1.5重量％以下的锰，0.020重量％以下的磷，0.015重量％以下的硫， 0.005〜0.10重量％的铝，0.0100重量％以下的氮，0.0002〜0.0100重量％的硼，至少一种选自钛的0.20重量％以下和0.25重量％以下的铌的元素 满足（Ti + Nb / 2）/ C> / = 4的量，并平衡铁和杂质。 金属结构选自铁素体和贝氏体铁素体。 溶解在谷物中的碳的量为1.0至4.0ppm。 本发明还提供一种热轧钢板的制造方法。 该方法包括对含有上述成分的钢板进行热轧，以不超过20℃/秒的速度冷却，然后在550℃〜700℃的温度下卷取 。

公开(公告)号：US5382302A

公开(公告)日：1995-01-17

申请号：US226957

申请日：1994-04-13

申请人： Susumu Okada ,  Kouichi Hirata ,  Susumu Sato ,  Masahiko Morita ,  Tsuguhiko Nakagawa

发明人： Susumu Okada ,  Kouichi Hirata ,  Susumu Sato ,  Masahiko Morita ,  Tsuguhiko Nakagawa

IPC分类号： C21D8/04 ,  C21D1/06

CPC分类号： C21D8/0457 ,  C21D8/0463 ,  C21D8/0473 ,  Y10S148/902

摘要： A high tensile steel sheet excelling in workability and stretch flanging formability, which is of a composite texture composed of a ferrite phase and a 2nd phase selected from the group consisting of martensite, bainite, pearlite, retained austenite and cold-transformed ferrite, wherein the volume fraction of the 2nd phase is hoe less than about 1.3 times higher at an outer region of the steel sheet than the volume fraction of the 2nd phase in a central region of the sheet thickness.

摘要翻译： 具有由铁素体相和选自马氏体，贝氏体，珠光体，残留奥氏体和冷变形铁素体组成的组的铁素体相和第二相组成的复合组织的加工性和拉伸凸缘成形性优异的高强度钢板，其中， 第二相的体积分数在钢板的外部区域比在板厚中心区域的第二相的体积分数小约高出约1.3倍。