Effect of RH vacuum refining time on purity of GCr15 bearing steel
The influence of RH vacuum refining time on the content of oxygen,nitrogen,calcium,aluminum and the amount of inclusions in bearing steel was studied by means of systematic sampling,composition analysis and scanning electron microscopy.The results show that the content of oxygen,nitrogen,calcium,aluminum and the number of inclusions in molten steel can be reduced under the proper RH vacuum refining time.The on-site test showed that under the condition of RH vacuum cycle time of 20 minutes,the removal efficiency of oxygen,nitro-gen,calcium and the loss of aluminum in steel are 50%～60%,and the average size of inclusions in steel is 10.2 μm.The average number density of inclusions is 0.17/mm2.The removal effect is not obvious when vacuum cycle time is extended.
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