To meet the bearing performance requirements, heat treatment for the purpose of quenching and hardening is an indispensable process. The energy consumed in the heat treatment process accounts for about 25% of the total energy consumption in the bearing manufacturing process. There are many bearing heat treatment methods for the purpose of quenching and hardening. In most cases, it can be roughly divided into Integral quenching, carburizing quenching, high-frequency quenching, carbonitriding and so on.

Integral quenching is the most common bearing heat treatment process, and most of the materials use high carbon chromium bearing steel (GCr15). It is heated to about 840°C in a heat treatment furnace, and the carbide formed by spheroidizing annealing is appropriately and uniformly dissolved in the matrix, and then quenched and cooled, and then tempered at low temperature. Through undissolved carbides and carbides precipitated by tempering, a uniform precipitation structure is obtained, which can be used for bearings that require wear resistance.

Carburizing and quenching is a heat treatment that heats low-carbon alloy steel at around 930 ℃ in a heat treatment furnace, and manages the carburizing gas in the furnace to infiltrate and diffuse carbon from the surface to the inside, and perform quenching heat treatment. Due to the gradient of carbon concentration, the surface after quenching is hardened, and because the internal surface hardness is low, it is used for bearings that require impact resistance.

Induction hardening is a heat treatment using induction heating. It is mainly used for medium carbon steel, and is used for bearings for automobile wheels with complex shapes.

Carbonitriding involves adding about 5% of ammonia to the carburizing gas to precipitate nitrides near the surface layer. Taking into account the difference in solubility of carbon and nitrogen in austenite, it is usually treated at 750~850 ℃ lower than the carburizing temperature. In particular, it is most effective for extending the life of bearings used in an environment where foreign matter is mixed.

ZYS has the advanced heat treatment line. Please contact us by sales@zys.com.cn for any bearing inquiry.