Failure Reason of 30Cr13 Stainless Steel Circulating Water Pump Shaft

Through mechanical performance test, scanning electron microscopy, energy spectrum analyzing, metallographic analysis and other technical means, the reasons for the fracture of a 30Cr13 stainless steel circulating water pump shaft were analyzed. The results show that after the impeller seal failure, circulating water polluted by Br^- infiltrating into the gaps of both key-key groove and impeller-shaft, corrosion fatigue fracture occured under the effect of cyclic fatigue load.