General Administration of Quality Supervision, Inspection and Quarantine: The pass rate of the third batch of bearing steel product quality random inspection is 100%

Recently, the General Administration of Quality Supervision, Inspection and Quarantine announced the results of the third batch of quality inspections of bearing steel products. This time, a total of 46 batches of products from 46 companies were inspected. The number of enterprises in this random inspection is about 30% of the number of enterprises that have obtained production licenses, which can reflect the current overall quality of bearing steel products. Bearing steel is a kind of steel used to make balls, rollers and sleeves of rolling bearings, and can also be used to make precision measuring tools, cold stamping dies, and machine tool screws. The spot check focused on the chemical composition, microporosity, decarburization layer, microstructure, carbide band, carbide network, carbide liquid separation, low magnification inspection and non-metallic inclusions of bearing steel. detection. The test results show that the chemical composition test and product annealing hardness test are all qualified, microscopic pores, decarburized layer, microstructure, carbide band, carbide network, carbide liquid separation, low magnification test and non-metallic inclusions The inspections all meet the standard requirements. However, from the analysis of the inspection data, it can be seen that due to the low level of production equipment and poor production control in some enterprises, the stability of product quality still needs to be improved. The spot check also reflects that some large state-owned enterprises produce bearing steel with high levels of non-metallic inclusions, which proves that they are not strict enough in bearing steel smelting control. In recent years, my country's bearing industry has developed rapidly, and China has become one of the world's largest bearing producers. The industries that use bearings in China are mainly concentrated in automobiles, motorcycles, household appliances, railway bearings, agricultural machinery, metallurgical mining machinery, petrochemical machinery and textile machinery. Bearings are the core components of mechanical equipment, and the quality of bearing steel is the basis for high-temperature bearings.

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