1962年末,为消除和改善钢轨裂纹缺陷,以提高重轨的一级品率。其措施之一即增加钢轨高度方向的垂直压下量。目前所用的196×196方坯,在钢轨高度方向的垂直压下量仅56毫米,为使此值再增加,则要求增大钢坯的高度。根据初轨厂连轧机轧制矩形坯的可能性,及保证钢轨成品的定尺长度,而拟定了断面为 In late 1962, in order to eliminate and improve the rail crack defects, in order to improve the first-rate heavy rail. One of its measures is to increase the vertical reduction of the rail height. The currently used 196 × 196 billet, with a vertical reduction of only 56 mm in the rail height direction, requires an increase in the height of the billet for further increases in this value. According to the possibility of rolling the rectangular billet in the initial rail mill and ensuring the fixed length of the rail finished product,