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    Hot rolled steel sheets and method of producing the same
    1.
    发明授权
    Hot rolled steel sheets and method of producing the same 失效
    热轧钢板及其制造方法

    公开(公告)号：US5853503A

    公开(公告)日：1998-12-29

    申请号：US817947

    申请日：1997-04-28

    申请人： Kazuhiro Seto ,  Kei Sakata ,  Osamu Furukimi ,  Takashi Obara

    发明人： Kazuhiro Seto ,  Kei Sakata ,  Osamu Furukimi ,  Takashi Obara

    IPC分类号： B21B1/22 ,  B21B1/26 ,  B21B45/08 ,  C21D8/02 ,  C22C38/00 ,  C22C38/06 ,  C22C38/14 ,  C22C38/04

    CPC分类号： C22C38/06 ,  B21B45/08 ,  C21D8/0226 ,  C21D8/0278 ,  B21B1/227 ,  B21B1/26

    摘要： After a starting material of steel comprising C: 0.001-0.20 wt %, Si: 0.01-0.50 wt %, Mn: 0.05-2.0 wt %, P: not more than 0.05 wt %, S: not more than 0.05 wt %, sol.Al: 0.01-0.10 wt %, N: not more than 0.020 wt % and the balance being Fe and inevitable impurities is heated above AC.sub.3 point, rough rolling is completed within a temperature range of (Ar.sub.3 point+100.degree. C.)-(Ar.sub.3 point+50.degree. C.), and super-high pressure descaling is carried out under conditions satisfying a jetting pressure of not less than 25 kgf/cm.sup.2 and a liquid quantity density of not less than 0.002 liter/cm.sup.2, and subsequently finish rolling at a rolling reduction of not less than 80% above Ar.sub.3 point of a rolling completion temperature is started in 5 seconds and coiling is carried out below 700.degree. C., whereby hot rolled steel sheets having a surface roughness Ra of not more than 0.8 .mu.m and an average scale thickness of not more than 4 .mu.m is produced and the adhesion property in case of subjecting to shaping at a mill scale state and the pickling efficiency in case of applying to pickling are improved.

    摘要翻译： PCT No.PCT / JP96 / 02455 Sec。 371日期1997年04月28日 102（e）日期1997年4月28日PCT提交1996年8月30日PCT公布。 出版物WO97 / 08355 日期1997年3月6日在C：0.001-0.20重量％，Si：0.01-0.50重量％，Mn：0.05-2.0重量％，P：不大于0.05重量％的钢的起始原料之后，S：不大于 0.05重量％，sol.Al：0.01-0.10重量％，N：不大于0.020重量％，余量为Fe和不可避免的杂质被加热到AC3以上，在（Ar3点+ 100）的温度范围内完成粗轧 ℃） - （Ar3点+ 50℃），超高压除鳞在满足不低于25kgf / cm 2的喷射压力和不小于0.002升/分钟的液体密度的条件下进行， cm2，然后在5秒钟内开始轧制完成温度以上Ar3以上80％以上的压延成形，在700℃以下进行卷取，得到具有表面粗糙度Ra的热轧钢板 不大于0.8μm，平均刻度厚度不大于4μm，并且在经受t o在轧制规模状态下成型，并且在施加酸洗的情况下的酸洗效率得到改善。

    High-strength high-workability cold rolled steel sheet having excellent impact resistance
    2.
    发明授权
    High-strength high-workability cold rolled steel sheet having excellent impact resistance 有权
    耐冲击性优异的高强度高加工性冷轧钢板

    公开(公告)号：US06210496B1

    公开(公告)日：2001-04-03

    申请号：US09230888

    申请日：1999-02-12

    申请人： Syusaku Takagi ,  Kazuya Miura ,  Osamu Furukimi ,  Kei Sakata ,  Takashi Obara

    发明人： Syusaku Takagi ,  Kazuya Miura ,  Osamu Furukimi ,  Kei Sakata ,  Takashi Obara

    IPC分类号： C22C3802

    CPC分类号： C22C38/38 ,  C22C38/34

    摘要： A cold rolled steel sheet having high strength and high formability and having excellent crushing performance can include 0.05-0.40 mass % of C, 1.0-3.0 mass % of Si, 0.6-3.0 mass % of Mn, 0.02-1.5 mass % of Cr, 0.010-0.20 mass % of P and 0.01-0.3 mass % of Al, with the remainder consisting essentially of Fe. The steel sheet includes a ferrite major phase and a minor phase consisting of martensite, acicular ferrite and retained austenite. The cold rolled steel sheet can be used in automobiles.

    摘要翻译： 具有强度高，成形性高，破碎性能优异的冷轧钢板可以包括C：0.05〜0.40质量％，Si：1.0〜3.0质量％，Mn：0.6〜3.0质量％，Cr：0.02〜1.5质量％ P为0.010〜0.20质量％，Al为0.01-0.3质量％，余量基本上由Fe组成。 钢板包括铁素体主相和由马氏体，针状铁素体和残余奥氏体组成的次相。 冷轧钢板可以用于汽车。

    High-ductility steel sheet excellent in press formability and strain age hardenability, and method for manufacturing the same
    4.
    发明授权
    High-ductility steel sheet excellent in press formability and strain age hardenability, and method for manufacturing the same 失效
    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：US06818074B2

    公开(公告)日：2004-11-16

    申请号：US10163728

    申请日：2002-06-06

    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： C22C3802

    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 &Dgr;TS 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。

    Method for producing hot-dip galvanized steel sheet having high strength and also being excellent in formability and galvanizing property
    5.
    发明授权
    Method for producing hot-dip galvanized steel sheet having high strength and also being excellent in formability and galvanizing property 有权
    具有高强度并且成型性和镀锌性优异的热浸镀锌钢板的制造方法

    公开(公告)号：US06537394B1

    公开(公告)日：2003-03-25

    申请号：US09868674

    申请日：2001-06-21

    申请人： Kazunori Osawa ,  Kei Sakata ,  Osamu Furukimi ,  Yoshitsugu Suzuki ,  Akio Shinohara

    发明人： Kazunori Osawa ,  Kei Sakata ,  Osamu Furukimi ,  Yoshitsugu Suzuki ,  Akio Shinohara

    IPC分类号： C12D800

    CPC分类号： C23C2/02 ,  C21D8/0226 ,  C21D8/0273 ,  C21D8/0278 ,  C21D8/0478 ,  C21D2211/005 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C23C2/28

    摘要： A hot-dip galvanized high-strength steel sheet having superior workability and galvanizability containing: 0.01% to 0.20% by weight of C; 1.0% by weight or less of Si; more than 1.5% to 3.0% by weight of Mn; 0.10% by weight or less of P; 0.05% by weight or less of S; 0.10% by weight or less of Al; 0.010% by weight or less of N; 0.010% to 1.0% by weight in total of at least one element selected from the group consisting of Ti, Nb, and V; and the balance being Fe and incidental impurities; in which the steel sheet has the metal structure in which the areal rate of the ferrite phase is 50% or more, the ferrite phase has an average grain diameter of 10 &mgr;m or less, and the thickness of a band-like structure composed of the second phase satisfies the relationship Tb/T≦0.005, where Tb is the average thickness in the sheet thickness direction of the band-like structure and T is the thickness of the steel sheet, and a method for producing the same. To provide a method for producing a hot-dip galvanized high-strength steel sheet in which superior workability and high strength are obtained and moreover satisfactory galvanizability is obtained when galvanizing is performed using facilities such as a continuous galvanizing line.

    摘要翻译： 一种具有优异的加工性和镀层性的热浸镀锌高强度钢板，其含有：0.01〜0.20重量％的C，1.0重量％以下的Si，1.5重量％〜3.0重量％的Mn，0.10重量％ 以下的P：0.05重量％以下，S：0.10重量％以下，Al：0.010重量％以下，N：0.010重量％以下，0.010〜1.0重量％ 由Ti，Nb和V组成的组; 余量为Fe和杂质;其中钢板具有铁素体相的面积率为50％以上的金属结构，铁素体相的平均粒径为10μm以下，厚度为 由第二相组成的带状结构满足Tb / T <0.005的关系，其中Tb是带状结构的板厚方向上的平均厚度，T是钢板的厚度， 为了生产相同。 为了提供一种能够获得优异的加工性和高强度的热镀锌高强度钢板的制造方法，并且当使用诸如连续镀锌线的设备进行镀锌时，获得了令人满意的镀锌性。

    High tensile hot-rolled steel sheet having excellent strain aging hardening properties and method for producing the same
    6.
    发明授权
    High tensile hot-rolled steel sheet having excellent strain aging hardening properties and method for producing the same 有权
    具有优异的应变时效硬化性能的高强度热轧钢板及其制造方法

    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。

    High tensile cold-rolled steel sheet excellent in ductility and in strain aging hardening properties, and method for producing the same
    7.
    发明授权
    High tensile cold-rolled steel sheet excellent in ductility and in strain aging hardening properties, and method for producing the same 有权
    延展性和应变时效硬化性优异的高强度冷轧钢板及其制造方法

    公开(公告)号：US06692584B2

    公开(公告)日：2004-02-17

    申请号：US10009957

    申请日：2001-12-12

    申请人： Kei Sakata ,  Akio Tosaka ,  Osamu Furukimi

    发明人： Kei Sakata ,  Akio Tosaka ,  Osamu Furukimi

    IPC分类号： C22C3806

    CPC分类号： C22C38/001 ,  C21D8/0236 ,  C21D8/0273 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/02 ,  C22C38/04

    摘要： The present invention provides a high tensile cold-rolled steel sheet having superior ductility, strain age-hardening characteristics, and crash resistance properties, and also provides a manufacturing method therefor. As a particular means, a thin cold-rolled steel sheet containing 0.05% to 0.30% of C, 0.4% to 2.0% of Si, 0.7% to 3.0% of Mn, 0.08% or less of P, 0.02% or less of Al, and 0.0050% to 0.0250% of N on a mass % basis is manufactured in which N/Al is 0.3 or more. This thin cold-rolled steel sheet is heated to a temperature between (an Ac1 transformation point) and (an Ac3 transformation point+50° C.), is cooled at a cooling rate of 5 to 150° C./second in the range of at least 600 to 500° C., and is held in the temperature range of 350 to 500° C. This steel sheet has superior ductility, strain age-hardening characteristics having a &Dgr;TS of 50 MPa or more, and crash resistance properties.

    摘要翻译： 本发明提供一种具有优异的延展性，应变时效硬化特性和抗冲击性能的高拉伸冷轧钢板，并且还提供其制造方法。 作为具体的方法，可以使用含有C：0.05〜0.30％，Si：0.4〜2.0％，Mn：0.7〜3.0％，P：0.08％以下，Al：0.02％以下的薄型冷轧钢板 ，制造N / Al为0.3以上的基于质量％的0.0050〜0.0250％的N。 将该薄型冷轧钢板加热至（Ac1相变点）和（Ac3相变点+ 50℃）之间的温度，以5〜150℃/秒的冷却速度 为至少600〜500℃，保持在350〜500℃的温度范围。该钢板具有优异的延展性，ΔTS为50MPa以上的应变时效硬化特性，耐冲击性。

    HIGH TENSILE STRENGTH HOT-ROLLED STEEL SHEET HAVING SUPERIOR STRAIN AGING HARDENABILITY AND METHOD FOR PRODUCING THE SAME
    9.
    发明申请
    HIGH TENSILE STRENGTH HOT-ROLLED STEEL SHEET HAVING SUPERIOR STRAIN AGING HARDENABILITY AND METHOD FOR PRODUCING THE SAME 审中-公开
    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。