In order to improve the shape precision on the tread and the size precision of rail height of 60kg/m heavy rail, the method of rolling heavy rail with the full-universal finish pass was advanced based on the half-universal rolling method.
为提高60kg/m重轨轨头踏面的形状精度和轨高尺寸精度,在半万能轧制法的基础上,提出了全万能成品孔轧制法。