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    Coated seizure-hardening type cold-rolled steel sheet having excellent aging resistance and method of production thereof
    2.
    发明授权
    Coated seizure-hardening type cold-rolled steel sheet having excellent aging resistance and method of production thereof 失效
    耐老化性优异的涂布硬化型冷轧钢板及其制造方法

    公开(公告)号：US06171412B2

    公开(公告)日：2001-01-09

    申请号：US09194533

    申请日：1998-11-25

    申请人： Saiji Matsuoka ,  Masahiko Morita ,  Osamu Furukimi ,  Takashi Obara ,  Tetsuya Kiyasu ,  Yoshio Yamazaki

    发明人： Saiji Matsuoka ,  Masahiko Morita ,  Osamu Furukimi ,  Takashi Obara ,  Tetsuya Kiyasu ,  Yoshio Yamazaki

    IPC分类号： C21D800

    CPC分类号： C22C38/14 ,  C21D8/02 ,  C21D8/0426 ,  C21D8/0431 ,  C21D8/0436 ,  C21D8/0473 ,  C22C38/12

    摘要： Disclosed are bake-hardenable sheet steel with good anti-aging property and a method for producing it. While controlling its C, P, S and N contents, the chemical composition of the sheet steel is defined to comprise not larger than 1.0% of Si, not larger than 3.0% of Mn, from 0.01 to 0.20% of Al and from 0.001 to 0.2% of Ti, in terms of % by weight. The value A (=(AIQUENCH−AI)/AIQUENCH) of the sheet steel is defined to be not smaller than 0.4 and the value AIQUENCH thereof to be not smaller than 30; or the ratio of the mean misorientation, M (degree), to the mean grain size, G (&mgr;m), M/G, of the sheet steel is defined to be not smaller than 0.8. The steel may additionally contain from 0.001 to 0.2% of Nb and/or from 0.0001 to 0.0080% of B. While controlling its Si, Mn, S, Al and N contents, the chemical composition of a steel slab is defined to comprise from 0.005 to 0.02% of C, not larger than 0.05% of P and from 0.025 to 0.19% of Nb, with satisfying the condition of 0.7×(C/12)≦Nb/93≦1.2×(C/12) (where C indicates the C content (wt. %), and Nb indicates the Nb content (wt. %)). To produce bake-hardenable sheet steel from it, the slab is heated, hot-rolled at a finishing delivery temperature of from 960 to 650° C., coiled at a temperature of from 750 to 400° C., then cold-rolled to a reduction of from 50 to 95%, and thereafter annealed for recrystallization at a temperature of from 750 to 920° C. The slab may additionally contain B and/or Ti. The invention stably produces bake-hardenable sheet steel on an industrial scale.

    摘要翻译： 公开了具有良好抗老化性能的可烘烤硬化性钢板及其制造方法。 在控制其C，P，S和N含量的同时，将钢板的化学成分定义为不大于1.0％的Si，不大于Mn的3.0％，Al的0.01至0.20％和0.001至 0.2％Ti，以重量％计。 将钢板的值A（=（AIQUENCH-AI）/ AIQUENCH）定义为不小于0.4且其AIQUENCH值不小于30; 或平均取向度M（度）与平均晶粒尺寸G（mum），M / G的比值定义为不小于0.8。 钢可以另外含有0.001-0.2％的Nb和/或0.0001-0.0080％的B。在控制其Si，Mn，S，Al和N含量的同时，钢坯的化学组成定义为包含0.005 至0.02％的C，不大于0.05的P和0.025至0.19％的Nb，满足0.7x（C / 12）<= Nb / 93 <= 1.2×（C / 12）的条件（其中 C表示C含量（重量％），Nb表示Nb含量（重量％））。 为了从其制造可烘烤硬化的钢板，在960〜650℃的最终输送温度下对板坯进行加热，热轧，在750〜400℃的温度下卷取，然后冷轧至 减少50至95％，然后在750至920℃的温度下退火再结晶。板可以另外含有B和/或Ti。 本发明在工业规模上稳定地生产可烘烤硬化钢板。

    Steel pipe having high ductility and high strength and process for production thereof
    3.
    发明授权
    Steel pipe having high ductility and high strength and process for production thereof 有权
    具有高延展性和高强度的钢管及其生产方法

    公开(公告)号：US06331216B1

    公开(公告)日：2001-12-18

    申请号：US09214226

    申请日：1998-12-30

    申请人： Takaaki Toyooka ,  Akira Yorifuji ,  Masanori Nishimori ,  Motoaki Itadani ,  Yuji Hashimoto ,  Takatoshi Okabe ,  Nobuki Tanaka ,  Taro Kanayama ,  Osamu Furukimi ,  Masahiko Morita ,  Takaaki Hira ,  Saiji Matsuoka

    发明人： Takaaki Toyooka ,  Akira Yorifuji ,  Masanori Nishimori ,  Motoaki Itadani ,  Yuji Hashimoto ,  Takatoshi Okabe ,  Nobuki Tanaka ,  Taro Kanayama ,  Osamu Furukimi ,  Masahiko Morita ,  Takaaki Hira ,  Saiji Matsuoka

    IPC分类号： C21D713

    CPC分类号： C21D8/10 ,  C21D2201/00 ,  C21D2211/005

    摘要： The steel pipe has a structure composed mainly of ferrite or ferrite plus pearlite or ferrite plus cementite. The steel pipe is characterized by grain size not greater than 3 &mgr;m, preferably not greater than 1 &mgr;m, elongation greater than 20%, tensile strength (TS:MPa) and elongation (E1:%) whose product is greater than 10000, and percent ductile fracture greater than 95%, preferably 100%, measured by Charpy impact test on an actual pipe at −100° C. The structure is characterized by C: 0.005-0.03%, Si: 0.01-3.0%, Mn: 0.01-2.0%, and Al: 0.001-0.10% on a weight basis, and is composed of ferrite or ferrite and a secondary phase, with ferrite grains being not greater than 3 &mgr;m and the secondary phase having an areal ratio not more than 30%. A steel pipe stock having the above-mentioned composition is heated at a temperature of (Ac1+50° C.) to 400° C. and subsequently reduced at a rolling temperature of (Ac1+50° C.) to 400° C. such that the cumulative reduction of diameter is greater than 20%. The reducing is preferably performed such that at least one of rolling passes reduces the diameter by more than 6% per pass. The steel pipe will have high ductility and high strength and will be superior in toughness and stress corrosion cracking resistance, if the content of C, Si, Mn, and other alloying elements is limited low and reducing is performed at the temperature specified above. The resulting steel pipe has good fatigue resistance and is suitable for use as line pipe.

    摘要翻译： 钢管具有主要由铁素体或铁素体加珠光体或铁素体和渗碳体组成的结构。 钢管的特征在于，其粒径不大于3μm，优选不大于1μm，伸长率大于20％，拉伸强度（TS：MPa）和伸长率（E1：％）大于10000， 延性断裂大于95％，优选100％，通过夏比冲击试验在-100℃的实际管上测量。该结构的特征在于C：0.005-0.03％，Si：0.01-3.0％，Mn：0.01-2.0 ％，Al：0.001-0.10％，由铁素体或铁素体和二次相组成，铁素体晶粒不大于3μm，第二相的面积比不大于30％。 将具有上述组成的钢管坯料在（Ac1 + 50℃）的温度下加热至400℃，随后在（Ac1 + 50℃）的轧制温度下降低至400℃。 使得直径的累积减小大于20％。 优选地进行还原，使得至少一个轧制通道将直径每次通过减少6％以上。 如果C，Si，Mn和其他合金元素的含量低，并且在上述规定的温度下进行还原，则钢管将具有高延展性和高强度，并且在韧性和耐应力腐蚀开裂性方面优异。 所得钢管具有良好的抗疲劳性能，适用于管线管。

    High-ductility steel sheet excellent in press formability and strain age hardenability, and method for manufacturing the same
    6.
    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。