Abstract:The fatigue life test of 60Si2Mn spring steel was conducted. The experimental results showed that the fatigue life was relatively short, which could not meet the standard requirements (≥2×105times). The fractured spring in fatigue test was analyzed and detected by the means of chemical composition analysis, fracture observation, energy spectrum analysis and metallographic examination. The results showed that the microcrack on the surface of steel wire was the direct reason to cause spring fatigue fracture. The microcrack was caused by the rolling defects on the surface of base metal. The hardened tissue was formed on surface after drawing and the microcrack was generated due to the insufficient ductility. Supersize inclusions existed near the surface of steel wire. They were typical foreign macroscopic inclusions in continuous casting process, which accelerated the spring fatigue fracture indirectly.