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周期式轧机的轧辊是在强大撞击、轧制金属温度急剧变化和大压力的条件下运转。因此对轧辊的强度和耐磨性提出严格的要求。强度低的轧辊容易损坏。轧辊磨损将导致孔型断面的改变和轧辊工作表面损伤,从而影响所轧钢管的尺寸精度和表面光洁度。耐磨性低还会造成轧机经常换辊。为了提高耐磨性和轧机的作业率,周期式轧辊应当用各种合金钢铸坯生产,有时也用锻坯生产,并进行复杂的热处理。过共析钢轧辊经这样的热处理后,硬度为
Periodic mill roll is in a strong impact, the rapid changes in temperature and rolling metal temperature under the conditions of operation. Therefore, the strength and wear resistance of the mill put forward strict requirements. Low strength rolls are easily damaged. Roll wear will lead to changes in hole profile and roll work surface damage, thereby affecting the dimensional accuracy of steel pipe and surface finish. Low wear resistance can also cause the mill to change rolls frequently. In order to improve the wear resistance and mill operating rate, the cycle of the roll should be produced using a variety of alloy steel slabs, and sometimes also used forging production, and complex heat treatment. Hypereutectic steel roll after such heat treatment, hardness