Bearing steel

Ball bearing steel is used in the manufacture of rolling bearings, roller and sleeve and other types of steel, also can be used in the production of precision measuring tool, cold stamping dies, machine screw, and diesel engine oil pump precision matching parts. S an overview of the bearing steel bearing steel is used in the manufacture of ball bearing, roller bearing ring and steel. Bearing is in the work under great pressure and friction, so the requirement bearing steel has high and even hardness and wear resistance, and high elastic limit. On the uniformity of the chemical composition of bearing steel, the content and distribution of non-metallic inclusions are very demanding, and the distribution of the carbide bearing steel is also called the high carbon steel luo, a carbon Wc is approximately 1%, Wcr luo content is 0. 5% - 1. 65%. Bearing steel is divided into high carbon, luo luo bearing steel bearing steel, carburized bearing steel, stainless bearing steel, high temperature bearing steels and anti magnetic bearing steel s chemical composition in 6 categories, gb, in addition to standard, Japanese standard main chemical composition of steel grade table s. Main to check the physical properties of the physical properties of bearing steel decarburization layer, non-metallic inclusion, microstructure, macrostructure. Usually in hot rolled annealed, cold-drawn annealing delivery of the goods. Delivery status should be indicated in the contract. The macrostructure of steel must be free of shrinkage cavity and subcutaneous bubbles, white spots and microscopic pore. Which center loose loose, shall not be more than 1. Level 5, segregation shall not exceed the level 2. Steel annealing organization should be evenly distributed fine granular pearlite. Decarburization layer depth, non-metallic inclusions and carbide uneven degree should be in conformity with the relevant national standards of the relevant provisions. ■。 Packing package delivery to the diameter of less than 20 mm, more than 20 mm can be naked when delivery of the goods. For cold drawn steel should apply anti-rust oil. The goods before delivery should be attached to the guarantee of quality, indicate the steel grade, heat number, weight, specifications, chemical composition, testing standard and inspection results. ■。 Manufacturing method of the bearing steel smelting quality requirement is very high, need to strictly control the sulfur and phosphorus and the content and distribution of non-metallic inclusion, because the content and distribution of non-metallic inclusions had a great influence on the service life of bearing steel. The higher the amount of inclusions, the shorter the life. In order to improve the smelting quality, recently has been used and the electroslag remelting furnace smelting, also adopts the vacuum smelting, vacuum consumable refining and other new technology to improve the quality of bearing steel. ■。 Purpose than do ball bearing, bearing ring thereof, and sometimes also used to make tools, such as punching die, measuring tool, tap, etc. ■。 Main production plants and importing country, district dalian steel plant in China, the main producing area of daye steel plant is the production of bearing steel. The main exports to Hong Kong and southeast Asia. ■。 Main production countries import main bearing steel imported from Japan, Germany in China. ■。 Species in our country is now producing high carbon chromium stainless bearing steel, the main steel grade nine cr18; Carburizing bearing steel, the main steel grade are G20CrMo; Chromium bearing steel, the main steel grade are GCr15. ■。 Specifications and appearance quality: the main specifications have round steel, flat steel, steel wire, etc. Steel surface should be processed in good condition. Can not have crack, folding, scarring and inclusions. Cold drawn steel surface should be smooth, clean and no oxide coating. ( 1]