AQSIQ recently announced the results of the third batch of national supervision and spot checks on the quality of bearing steel products. A total of 46 batches of products from 46 companies were spot-checked. The number of enterprises was approximately 30% of the number of enterprises that had obtained production licenses, reflecting the current situation. The overall quality of bearing steel products. After testing, 46 companies in 46 batches of products are all qualified, and the spot-checking rate of qualified companies and products are 100%. Bearing steel is used to manufacture ball bearings, rollers, and sleeves for rolling bearings. It can also be used to make precision gauges, cold punches, and machine screws. The spot checks focused on the chemical composition of the bearing steel, microscopic pores, decarburized layers, microstructures, carbide strips, carbide networks, carbide liquefaction, low-power inspection and non-metallic inclusions and other indicators. Testing. Test results show that: chemical composition test, product annealing hardness test are qualified, microscopic pores, decarburized layer, microstructure, carbide strip, carbide mesh, carbide liquefaction, low magnification test and non-metallic inclusions The tests meet the standard requirements. However, from the analysis of inspection data, it can be seen that, due to the low level of production equipment and poor production control, some enterprises still need to improve their product quality stability. The spot check also reflected the high level of non-metallic inclusions in bearing steels produced by some large state-owned enterprises, which proves that they are not strict enough in bearing steel smelting control. Round Steel Bar,Round Alloy Steel Bar,Steel Round Bar,ASTM Stainless Round Steel Bar Liaocheng Changyi Metal Material Co.,Ltd , https://www.changyisteel.com
In recent years, the rapid development of China's bearing industry, China has become one of the world's largest bearing producer. The industries that use bearings in China are mainly concentrated in automobiles, motorcycles, household appliances, railway bearings, agricultural machinery, metallurgy and mining machinery, petrochemical machinery, and textile machinery.