Abstract: After 5 months of online use, abnormal shaking was observed during the operation of a certain type of hot-rolling reel. The drum was subsequently disassembled for inspection, revealing a fracture in the hollow shaft at the tie rod location. The fracture failure of the hollow shaft was analyzed through such as macroscopic observation, chemical composition analysis, hardness testing, mechanical property testing, and metallographic examination.The results indicated that the fracture surface exhibited distinct fatigue striations, confirming that the failure mode was fatigue fracture. The mechanical properties and hardness values of the hollow shaft did not meet the design requirements. Furthermore, the presence of excessive undissolved ferrite and non-metallic inclusions in the microstructure at the fracture site was identified as the primary cause of fatigue crack initiation.