High standard 6200 ball bearing

In terms of heat treatment process, it has developed from car hearth fuace and bell fuace to continuous controllable atmosphere annealing fuace heat treatment. Through controlled rolling or rapid cooling after rolling, the network carbide is eliminated, and a suitable preliminary structure is obtained, which can shorten the spheroidizing annealing Mechanical Bearing 608 time of the bearing steel, refine the carbide, and improve the fatigue life.

Developed high-frequency hardening bearing steel, using ordinary medium-carbon steel or medium-carbon manganese, chromium steel to replace ordinary bearing steel through high-frequency heating and quenching, which not only simplifies the production process, reduces the cost, and increases the service life. After rolling, air cooling and short-time annealing are adopted, or the spheroidizing annealing process is completely eliminated, and a qualified bearing steel structure can be obtained. How to obtain the spheroidization structure is an important issue in the production of bearing steel, and controlled rolling and cooling is an important production process for advanced bearing steel.

There is an urgent need to develop good processing performance, low cost, and fatigue. Bearing steel generally develops towards high quality, high performance and multiple varieties. In order to reduce the oxygen content of bearing steel, smelting technologies of bearing steel such as vacuum smelting, electroslag remelting and electron beam remelting have been developed. The structure of the bearing steel in use should be the tempered martensite matrix with fine carbide particles evenly distributed.

Through unremitting efforts, the minimum oxygen content in bearing steel has been reduced from 28 ppm in the 1960s to 5 ppm in the 1990s. Improving the cleanliness of bearing steel, especially reducing the oxygen content in the steel, can significantly extend the life of the bearing. In order to extend the life of bearing steel, people have been working on developing and applying refining technology for many years to reduce the oxygen content in steel. Strength, necessary toughness, certain hardenability, corrosion resistance in atmospheric lubricants.45%, and the carburizing time is shortened from 7 hours to 30 minutes. In the future, bearing steel will mainly develop in two directions: high cleanliness and diversified performance