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    Production method of ultra fine grain steel
    4.
    发明授权
    Production method of ultra fine grain steel 失效
    超细晶粒钢的生产方法

    公开(公告)号：US06464807B1

    公开(公告)日：2002-10-15

    申请号：US09512060

    申请日：2000-02-24

    申请人： Shiro Torizuka ,  Osamu Umezawa ,  Kaneaki Tsuzaki ,  Kotobu Nagai

    发明人： Shiro Torizuka ,  Osamu Umezawa ,  Kaneaki Tsuzaki ,  Kotobu Nagai

    IPC分类号： C21D800

    CPC分类号： C21D8/00 ,  C21D7/13 ,  C21D2201/00 ,  C21D2211/005

    摘要： A method of producing a ultra fine grain steel made of ferrite having a mean grain size of not larger that 3 &mgr;m as the base phase, after ingoting raw materials, by austenitizing the ingot by heating it to a temperature of at least an Ac 3 point, then, applying compression working of a reduction ratio of at least 50% at a temperature of from an Ae 3 point or lower to an Ar 3 point −150° C., or at a temperature of at least 550° C., and thereafter, cooling, wherein the strain rate as compression working is in the range of from 0.001 to 10/second.

    摘要翻译： 制造平均粒径不大于3μm的铁素体作为基础相的原料，通过将锭加热至至少Ac 3点的温度来进行奥氏体化的方法， 然后，在Ae 3点以下的温度至Ar 3点-150℃，或至少550℃的温度下进行压缩比为50％以上的压缩加工，以及 然后进行冷却，其中作为压缩加工的应变速率在0.001〜10 /秒的范围内。

    Steel for Warm Working, Warm Working Method Using the Steel, and Steel Material and Steel Component Obtainable Therefrom
    6.
    发明申请
    Steel for Warm Working, Warm Working Method Using the Steel, and Steel Material and Steel Component Obtainable Therefrom 审中-公开
    用于工作的钢，使用钢的热加工方法，以及可获得的钢材和钢材

    公开(公告)号：US20090277539A1

    公开(公告)日：2009-11-12

    申请号：US12085304

    申请日：2006-11-21

    申请人： Yuuji Kimura ,  Tadanobu Inoue ,  Kaneaki Tsuzaki ,  Kotobu Nagai

    发明人： Yuuji Kimura ,  Tadanobu Inoue ,  Kaneaki Tsuzaki ,  Kotobu Nagai

    IPC分类号： C21D11/00 ,  C21D8/02 ,  C21D8/06 ,  C22C38/00

    CPC分类号： C21D9/46 ,  C21D8/0205 ,  C21D8/0231 ,  C21D8/0431 ,  C21D8/065 ,  C21D8/105 ,  C21D9/0075 ,  C21D9/0093 ,  C21D9/525 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18

    摘要： There are provided a steel for warm working, to be subjected to warm working as various structures, components of cars, and the like, a warm working method thereof, and a steel material and a steel component obtainable from the warm working method.[Solving Means] A steel is to have a particle dispersion type fiber structure formed in the matrix by warm working. The steel is characterized in that the total amount of the dispersed second-phase particles at room temperature is 7×10−3 or more in terms of volume fraction, and the Vickers hardness (HV) is equal to or larger than the hardness H of the following equation (2): H=(5.2−1.2×10−4λ)×102  (2) when the steel is subjected to any of annealing, tempering, and aging treatments in the as-unworked state under conditions such that a parameter λ expressed by the following equation (1): λ=T(log t+20)(T; temperature(K), t; time(hr))  (1) is 1.4×104 or more in a prescribed temperature range of 350° C. or more and Ac1 point or less. This steel is taken as the steel for warm working.

    摘要翻译： 提供一种用于温暖加工的钢，可以作为各种结构，汽车部件等进行温暖加工，其加热方法，以及可从该加热方法获得的钢材和钢部件。 [解决方案]钢是通过热加工形成在基质中的粒子分散型纤维结构体。 钢的特征在于，室温下分散的二相粒子的总量以体积分数计为7×10 -3以上，维氏硬度（HV）等于或大于下述的硬度H 等式（2）：H =（5.2-1.2×10-4λ）x102（2）当钢在非工作状态下进行任何退火，回火和老化处理时，条件是使得由 以下公式（1）：在350℃以上的规定温度范围内，λ= T（log t + 20）（T;温度（K），t;时间（hr））（1）为1.4×10 4以上 和Ac1点以下。 这种钢被作为温暖工作的钢。