Why do non-standard bearing will gradually become the foundation of the key parts

Non-standard bearing why will gradually become a key source of basic components: bearing | last updated: - 2020 09 - 23 of non-standard bearing steel smelting requirements for non-standard bearing steel, surface defects including cracks, slag inclusion, burr, scarring, scale, etc. , internal defects including shrinkage cavity, bubbles, white spots, such as severe osteoporosis and segregation. These defects for the processing of non-standard bearing, non-standard bearing performance and life has a great influence, explicitly stipulated in the non-standard bearing material standard is not allowed. These defects. Carbide inhomogeneity requirements in non-standard bearing steel, if there is a serious uneven distribution of carbide, are in the process of heat treatment process is easy to cause tissue and uneven hardness, the organization of the steel inhomogeneity has a larger effect on contact fatigue strength. In addition, the serious carbide inhomogeneity is easy to make non-standard bearing parts during quenching cracks, carbide inhomogeneity will results in the decrease of non-standard bearing life, therefore, in the material standard, non-standard bearing of different specifications of the steel have clear special requirements. Non-standard bearing has become the foundation of the key parts of non-standard bearings bearing is important in the equipment manufacturing industry, the basis of the key parts and components, directly decides the major equipment and host performance, quality and reliability of the product, known as the 'heart' part of the equipment manufacturing. After years of development, Chinese bearing industry has formed a large scale, the national bearing industry 2010 annual output value is about 130 billion yuan, ranked third in the world. Despite the scale of the development of Chinese bearing industry has been very big, but most are concentrated in the low-end, and in the field of high-end bearing manufacturing, our country there are still a considerable gap compared with developed countries. The domestic bearing industry association secretary-general Wang Quanqing has also made it clear that the domestic high-end bearing development speed still can't keep up with the development of the host. For example, our country has mastered the high-speed emu technology with independent intellectual property rights, but with the bearing is still dependent on imports. At present, most of the domestic bearing enterprises producing high-speed bearing can only meet 150 - 180 kilometers of the train, and the European and American countries high-speed bearing can satisfy the speed of 350 - 400 km the demand of the train, so, the current domestic high above 200 km/h emu matching iron bearing import basic rely on a high price. Based on the fact that our country high-end bearing behind 'planning' clear, will give full play to the guiding role of industrial policy, improve industry admittance threshold, containing low level repeated construction; Give 'sanki' industry, including bearing industry, fiscal and taxation support policy, the implementation of the key parts and raw materials import duty-free policy; Study and formulate encourage users to use 'sanki' policy of new products and new technology.