本文研究了７Ｃｒ２ＷＭｏＶＳｉ钢热处理过程的碳化物的变化。结果表明，随退火温度降低，碳化物尺寸减小，７８０～８００℃退火获得均匀而细化的球化组织；加热至９４０～９８０℃奥氏体化时，Ｍ＿３Ｃ、Ｍ＿（２３）Ｃ＿６已全部溶解，仍存在Ｍ＿６Ｃ和较多的ＶＣ剩余碳化物，有效地阻碍了奥氏体晶粒长大；随回火温度升高，按Ｍ＿３Ｃ、Ｍ＿（２３）Ｃ＿６、Ｍ＿６Ｃ、ＶＣ依次沉淀析出，各类碳化物的不同析出过程，提高了钢的回火抗力。 This paper studied the 7Cr2WMoVSi steel during the heat treatment of carbide changes. The results show that with the decrease of annealing temperature, the carbide size decreases and the uniform and refined spheroidization structure is obtained by annealing at 780 ~ 800 ℃. When heated to 940 ~ 980 ℃ for austenitization, M_3C and M_ (23) C_6 have all been M_6C and VC residual carbides still exist, which effectively hinder the grain growth of austenite. With the increase of tempering temperature, M_3C, M_ (23) C_6, M_6C and VC precipitated in turn, Different carbide precipitation process, improve the tempering resistance of steel.