含28～34%Cr和1.8～2.7%C的自口铁在重型机械制造业和动力机械制造业中日益广泛地用于制造在磨蚀磨损和很大的单位负荷条件下工作的零件。在铸铁组织中碳化物的存在能保证其具有高的耐磨性,但会使机械加工时的效率降低。通过在加工过程中材料分子键的减弱能提高高强度材料的加工效率,这通常是用将被加工零件加热的方法来达到的。在机械加工高铬铸铁轧辊时采用预热能使这种加工的效率提高2～4倍。本文研究了显微组织对采用预热加工的高 Self-tapping pigs containing 28-34% Cr and 1.8-2.7% C are increasingly used in heavy machinery and power machinery manufacturing to make parts that work under abrasive wear and large unit load. The presence of carbides in cast iron ensures that it has high wear resistance, but reduces the efficiency of machining. The processing efficiency of high-strength materials can be improved by reducing the molecular bond in the process, which is usually achieved by heating the part to be machined. The use of preheating in the machining of high-chromium cast iron rolls results in a 2 to 4 times increase in the efficiency of this process. This paper studies the microstructure of the preheating process using the high