本文对ZG3Cr24Ni7SiNRE钢制造的氧化钼焙烧炉主轴早期原因进行了分析。通过现场调查、化学成份分析、金相组织检验、电子显断口分析、残余内应力测试及热应力估算,结果表明主轴周向残余拉应力过大,沿晶界连续分布的链状碳化物网和脆性σ相的出现,弱化了晶界,在热应力和机械应力的作用下,使主轴早期开裂。 In this paper, ZG3Cr24Ni7SiNRE steel molybdenum oxide roaster main reason for the early analysis. Through field investigation, chemical composition analysis, metallographic examination, electronic fracture analysis, residual stress testing and thermal stress estimation, the results show that the residual tensile stress in the circumferential direction of the spindle is too large, and the chain carbide network continuously distributed along the grain boundary and The presence of brittle σ phase weakens the grain boundaries and causes the primary axis to crack early under the action of thermal and mechanical stresses.