Carbon chromium bearing steel annealing

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Carbon chromium bearing steel ball annealing is evenly distributed in the ferrite matrix with fine, small, uniform, round carbide particles organization in order to obtain, for the organization and preparation for subsequent cold working and final quenching and temper ing. The traditional ball annealing process is slightly higher than the Ac1 temperature (such as GCr15 780 ~ 810 ℃) after incubation with the furnace cooled slowly (25 ℃ / h) to 650 ℃ cooled baked. The process heat treatment for a long time (20h) [1], and after annealing of carbide particles is uneven, affect the subsequent cold working and the final microstructure and properties of the quenching and tempering. After that, according to the supercooled austenite transformation characteristics, development isothermal spheroidizing: rapid cooling after heating to Ar1 below a certain temperature range (690 ~ 720 ℃) ​​isothermal isothermal process austenite to ferrite and carbides of transition, after the completion of transition can be directly cooled baked. The advantage of this process is to save the heat-treating time (entire process is about 12 to 18h), the processed tissue carbide fine uniform. Another time-saving process is repeated ball annealing: first heated to 810 ℃ cooled to 650 ° C, and then heated to 790 ℃ after cooling to 650 ℃ cooled baked. This process, although save some time, but the process is relatively complex to operate.bearing manufacturers