我厂318和216轧管车间的主机设备是从国外进口的周期式轧机,其轧辊孔型的截面是由六个不等半径组成的桃型圆(图1)。周期轧机轧辊的体积较大,单辊重量为2,677～3,000kg,单辊价值为9,000～10,000元。轧辊的基体材质是9CrMo,属于高碳合金钢,含碳量0.9％。这种轧辊在冷热交替环境下工作时,其缺点表现为 The main equipment of our 318 and 216 rolling mills is a periodic mill imported from abroad. The cross section of the roll pass is composed of six peach circles of unequal radius (Figure 1). Rolling mill cycle volume larger, single roll weight of 2,677 ~ 3,000kg, single roll worth 9,000 to 10,000 yuan. Roll base material is 9CrMo, belonging to high carbon alloy steel, carbon content of 0.9%. The shortcoming of this kind of roll when working in hot and cold alternating environment is as follows