目前,许多主干线区段提出了铺设最重型钢轨的要求。 下塔吉尔钢厂制定的P—75型钢轨生产计划是:探讨新的锭型及轧辊孔型;研究轧制状态钢轨性能;审查利用现有热处理车间工艺设备的可能性及制定淬火工艺以研究淬 At present, many mainline sections propose the requirement to lay the heaviest rails. The production schedule of P-75 rails under Nizhny Tagil Steel is to explore new ingot and roll pass patterns, to study the performance of rolled rails, to examine the possibilities of utilizing existing heat treatment plant process equipment and to develop quenching processes to study Quench