Development of GCr15 Hot-rolled Bearing Pipe with Mandrel Mill

Described here in the essay are the chemical composition of the GCr15 bearing steel,and the manufacturing process flow and key working procedures of the Φ89 mm 3-roll retained-mandrel mill for producing the GCr15 bearing pipe.The production practice shows that the said process technology has got rid of all the conventional serious pollution-caused and high energy-consuming working procedures for manufacturing the bearing pipe,including pickling,phosphating,saponification and softening annealing etc.,being beneficial to energy-saving and environment protection;adopting the large compression ratio hot-rolling process is helpful for improving the stability and strength/toughness of the bearing ring matrix so as to enhance the service life of the bearing.The said manufacturing process technology for the GCr15 bearing pipe is feasible,and the product is satisfactory to the requirements by customers.