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    Method for producing high strength steel excellent in properties after warm working
    1.
    发明授权
    Method for producing high strength steel excellent in properties after warm working 失效
    热加工后性能优良的高强度钢的制造方法

    公开(公告)号：US4720307A

    公开(公告)日：1988-01-19

    申请号：US847288

    申请日：1986-04-02

    申请人： Kazuaki Matsumoto ,  Seishi Tsuyama ,  Hisatoshi Tagawa ,  Yoshitaka Yamasaki

    发明人： Kazuaki Matsumoto ,  Seishi Tsuyama ,  Hisatoshi Tagawa ,  Yoshitaka Yamasaki

    IPC分类号： C21D8/00 ,  C21D7/14

    CPC分类号： C21D8/00

    摘要： A steel which is excellent in mechanical properties after a warm working process is produced by specifying a chemical composition as claimed, subjecting the steel to a controlled rolling under conditions at temperatures of not more than 900.degree. C. and accumulated reduction of more than 30%, leaving it, after the controlled rolling, as it is in the air or performing it to an accelerated cooling wherein the steel is cooled at rate between the air cooling and 100.degree. C./sec until temperatures where a transformation finishes, subsequently reheating the steel to ranges between 400.degree. C. and 750.degree. C., and carrying out the warm working thereon instantaneously or after the air cooling at the temperatures between 250.degree. C. and 750.degree. C.

    摘要翻译： 通过规定所要求的化学组成来制造温加工后的机械性能优异的钢，在不高于900℃的温度条件下对钢进行受控轧制，并且累积减少30％以上 在受控轧制之后，将其留在空气中或将其进行加速冷却，其中钢在空气冷却和100℃/秒之间的速率下冷却直到转变完成的温度，然后再加热 钢在400℃至750℃的范围内，并在250℃至750℃的温度下瞬间或空气冷却后进行温热加工。

    Method for manufacturing steel article having high toughness and high strength
    4.
    发明授权
    Method for manufacturing steel article having high toughness and high strength 失效
    具有高韧性和高强度的钢制品的制造方法

    公开(公告)号：US4952250A

    公开(公告)日：1990-08-28

    申请号：US261240

    申请日：1988-10-21

    申请人： Kazuaki Matsumoto ,  Shinichi Suzuki ,  Hisatoshi Tagawa

    发明人： Kazuaki Matsumoto ,  Shinichi Suzuki ,  Hisatoshi Tagawa

    IPC分类号： C21D8/06 ,  C21D1/02 ,  C21D8/00 ,  C21D9/52 ,  C22C38/00 ,  C22C38/24 ,  C22C38/28 ,  C22C38/38 ,  C22C38/50

    CPC分类号： C22C38/38 ,  C21D1/02 ,  C21D8/00 ,  C21D8/005

    摘要： A method for manufacturing a steel article having a high toughness and a high strength, which comprises the steps of:using a material comprising:carbon : from 0.020 to 0.049 wt. %,silicon : from 0.10 to 1.00 wt. %,manganese : from 1.00 to 3.50 wt. %,chromium : from 0.50 to 3.50 wt. %,where the total amount of manganese and chromium being from 2.50 to 6.00 wt. %,aluminum : from 0.01 to 0.05 wt. %,boron : from 0.0003 t6o 0.0030 wt .%,titanium : from 0.005 to 0.030 wt. %, andthe balance being iron and incidental impurities, where, the amount of nitrogen as one of the incidental impurities being up to 0.006 wt. %;heating the material to the austenitization temperature region;hot-working the material in the austenitization temperature region to prepare a steel article; andcooling the steel article thus prepared from the austenization temperature region to a temperature of or lower than 300.degree. C. at a cooling rate of from 2 to 100.degree. C./second, thereby imparting a high toughness and a high strength to the steel article.

    Method of manufacturing high tensile strength steel plates
    5.
    发明授权
    Method of manufacturing high tensile strength steel plates 失效
    制造高抗拉强度钢板的方法

    公开(公告)号：US4572748A

    公开(公告)日：1986-02-25

    申请号：US722763

    申请日：1985-04-15

    申请人： Masataka Suga ,  Makoto Yamada ,  Kazuhide Takahashi ,  Nobuhiro Iwasaki ,  Kazuyuki Matsui ,  Toru Izawa ,  Itaru Watanabe ,  Hisatoshi Tagawa

    发明人： Masataka Suga ,  Makoto Yamada ,  Kazuhide Takahashi ,  Nobuhiro Iwasaki ,  Kazuyuki Matsui ,  Toru Izawa ,  Itaru Watanabe ,  Hisatoshi Tagawa

    IPC分类号： B21B3/00 ,  C21D1/18 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/44 ,  C22C38/54 ,  C21D1/62

    CPC分类号： C21D8/0226 ,  C22C38/44 ,  C21D1/18 ,  C21D8/021 ,  C21D8/0263

    摘要： The steel plate having a high tensile strength is manufactured from a steel consisting essentially of 0.04-0.16% by weight of C, 0.02-0.50% by weight of Si, 0.4-1.2% by weight of Mn, 0.2-5.0% by weight of Ni, 0.2-1.5% by weight of Cr, 0.2-1.0% by weight of Mo, 0.01-0.10% by weight of acid soluble Al, 0.03-0.15% by weight of one or more of V, Ti and Nb, 0.015% or less by weight of P, 0.006% or less by weight of S and the balance of iron and inherent impurities. The steel is heated to a temperature above a temperature at which carbo-nitrides of V and Nb and carbides of Ti become complete solid solution state, rolled with total reduction of 40% or more below 950.degree. C., quenched by simultaneous cooling immediately after completion of the rolling from a temperature above (A.sub.3 -50).degree.C. and tempered at a temperature lower than Ac.sub.1 temperature. The density of cooling water (W) for the quenching is detemined by the following equation (I) or (II) in accordance with the plate thickness (t):(I) for the plate over 40 mm thicknessW=0.7 to 1.5 m.sup.3 /min.multidot.m.sup.2(II) for the plate over 25 mm and under 40 mm thicknessW=0.7 to (8.5-0.1 t)/3 m.sup.3 /min.multidot.m.sup.2.

    摘要翻译： 具有高拉伸强度的钢板由基本上由以下组成的钢制成，所述钢主要由C，0.02-0.50重量％的Si，0.4-1.2重量％的Mn，0.2-5.0重量％的C， Ni，0.2-1.5重量％的Cr，0.2-1.0重量％的Mo，0.01-0.10重量％的酸溶性Al，0.03-0.15重量％的V，Ti和Nb中的一种或多种，​​0.015％ 或更少的P，0.006重量％以下的S和余量的铁和固有的杂质。 将钢加热到高于V和Nb的碳氮化物和Ti的碳化物变成完全固溶状态的温度的温度下，在950℃下总共降低40％以上的轧制，在立即冷却后立即淬火淬火 从高于（A3-50）℃的温度完成轧制，并在低于Ac1温度的温度下回火。 用于淬火的冷却水的密度（W）根据板厚度（t）由以下等式（I）或（II）确定：对于厚度大于40mm的板，板的厚度（t）为：（I）W = 0.7至1.5m 3 / minxm2（II），对于25mm以上且40mm以下厚度的板W = 0.7〜（8.5-0.1t）/ 3m 3 / min×m2。