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    • 38. 发明授权
    • Large diameter high strength rolled steel bar and a process for the
production of the same
    • 大直径高强度轧钢棒及其生产方法
    • US4775429A
    • 1988-10-04
    • US18730
    • 1987-02-24
    • Teruyuki MuraiYoshihiro Hashimoto
    • Teruyuki MuraiYoshihiro Hashimoto
    • C21D8/08C21D9/52C21D8/06
    • C21D9/525C21D8/08
    • A large diameter high strength hot rolled steel bar consisting of a low alloy steel having a carbon content of 0.3 to 0.9% and a metallurgical structure with a interlammelar spacing of 0.05 to 0.15 .mu.m, and having a diameter of at least 20 mm, a tensile strength of at least 120 kg/mm.sup.2 and a reduction of area of at least 20% is produced by a process comprising cooling a hot rolled steel bar at a constant rate, characterized by carrying out the cooling in such a controlled manner that the perlite transformation is started at a temperature of ranging from Tc to (Tc+40.degree. C.) wherein Tc is the critical temperature at which a cooling curve at a constant rate is tangent to the perlite transformation starting line of the continuous cooling transformation curve and the maximum temperature during the transformation is suppressed to at most (Tc+80.degree. C.).
    • 一种由碳含量为0.3〜0.9%的低合金钢和间隙为0.05〜0.15μm的冶金结构,直径为20mm以上的大直径高强度热轧钢棒, 通过包括以恒定速率冷却热轧钢筋的方法产生至少120kg / mm 2的拉伸强度和至少20%的面积减小,其特征在于以如此受控的方式进行冷却,使得珍珠岩 在Tc到(Tc + 40℃)的温度下开始转变,其中Tc是恒定速率下的冷却曲线与连续冷却转变曲线的珍珠岩转变起始线相切的临界温度, 转变期间的最高温度被抑制到最多(Tc + 80℃)。