在粗轧机架后，中型型材轧机有两组连续的机架。连续轧机，根据孔型设计既可以水平布置，轧辊，也可以立式布置。对于有平行缘的型钢和槽钢，还配有机架。

After the roughing mill，轧辊设备， there are two sets of continuous rack in the medium section mill. The continuous rolling mill can be arranged horizontally or vertically according to the pass design. For steel and channel steel with parallel edges， universal frame is also available.

而精轧辊速度较高，轧制终产品要有一定的表面质量，对它以硬度、耐磨等为主要要求。然后考虑轧辊使用时所应有的耐磨性。由于轧辊的磨损机理很复杂，轧辊厂家，包括机械应力作用、轧制时的热作用、冷却作用、润滑介质的化学作用以及其他作用。

And the high speed of the fine roller， the final product of rolling must have a certain surface quality， which is the main requirement for its hardness， wear resistance and so on. Then the wear resistance should be cidered when the roll is used. Because the wear mechanism of roller is very complicated， including mechanical stress， thermal action during rolling， cooling effect，轧辊设备生产， chemical action of lubricating medium and other functi.

常用的轧辊材质和用途见表。轧辊的性能和质量一般取决于其化学成分和制造方式并可由其组织、物理和力学性能以及存在于轧辊内部的残余应力类型来评估（见轧辊检验）。

The material and use of the commonly used rolls are shown in the table. The performance and quality of roller generally depend on its chemical  and manufacturing way， and can be evaluated by its organization， physical and mechanical properties and the type of residual stress existing inside the roll (see roll test).