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 Bearing steel pipe seamless steel pipe of the hot-rolled or cold-rolled (cold drawn), for the production of common rolling bearing rings. Steel pipe outer diameter of 25-180 mm, wall thickness of 3.5-20 mm, two kinds of sub-ordinary precision and high accuracy. Bearing steel is steel used to make a ball, roller and bearing rings. Bearing in the work under tremendous pressure and friction, so the bearing steel, high and uniform hardness and wear resistance, and high elastic limit. The uniformity of the chemical composition of bearing steel, non-metallic inclusion content and distribution, the distribution of carbide and other requirements are very stringent, all iron and steel production, one of the most demanding steel. 
 The physical properties of bearing steel microstructure to check decarburized layer, non-metallic inclusions in low magnification-based. Under normal circumstances, are hot-rolled annealed, cold drawn annealed delivery. Delivery status should be indicated in the contract. Macrostructure of the steel must be free from shrinkage, subcutaneous bubbles, white point and microscopic pores. Center porosity, generally loose and not more than 1.5, the segregation shall not be more than two. Steel annealing organization should be the uniform distribution of fine granular pearlite. Decarburization depth, non-metallic inclusions and carbide nonuniformity should be consistent with national standards. 

 Bearing steel smelting high quality requirements, the need for strict control over the content of sulfur, phosphorus, hydrogen, and the number of non-metallic inclusions and carbides size and distribution of nonmetallic inclusions and carbide quantity, size and distribution of the service life of bearing steel impact, often bearing failure is large inclusions or carbide around the micro-crack extension to. Closely related to the content of inclusions and steel oxygen content, the higher the oxygen content, the more the number of inclusions, the shorter the life. Inclusion and carbide particle size was increased, the more uneven distribution of the shorter service life, and their size distribution is used in the smelting process and the smelting quality is closely related to the main process for the production of bearing steel casting as well as smelting furnace + electroslag remelting process smelting, there is a small amount of double-vacuum vacuum induction + vacuum consumable or + repeatedly vacuum consumable and other technology to improve the quality of bearing steel. 

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