Annealing of high carbon chromium bearing steel

Source: China Bearing Network Time: 2014-07-16

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The spheroidizing annealing of high carbon chromium bearing steel is to obtain the arrangement of fine, small, uniform and round carbide particles uniformly distributed on the ferrite matrix; preparation for future cold processing and finishing quenching and tempering. The spheroidizing annealing process is carried out at a temperature slightly higher than Ac1 (such as GCr15 of 780-810 Â°C) and then cooled slowly (25 Â°C / h) to below 650 Â° C. The process heat treatment time is longer (20h or more). And the particles of the carbide after annealing are not uniform; affecting the future cold processing and the end quenching and tempering arrangement and function.
Afterwards; according to the transformation characteristics of supercooled austenite; develop isothermal spheroidizing annealing process: after heating, it is cooled to a temperature range below Ar1 (690-720 Â°C) for isothermal; austenite direction is completed during isothermal process The transformation of ferrite and carbide; after the completion of the transformation, it can be directly discharged into the air. The advantage of this process is the time of heat saving (the whole process is about 12-18h), and the carbides in the arrangement after the treatment are fine and uniform.
Another time-saving process is repeated spheroidizing annealing: first heating to 810 Â° C and then cooling to 650 Â° C; heating to 790 Â° C and then cooling to 650 Â° C to release air cooling. Although the process can save a certain moment; The operation is more complicated.
Damage status:
The damage of the cage has the deformation of the cage; the damage; the wear, etc. The breakage of the column. The deformation of the end face. The wear of the concave surface. The wear of the guide surface.
the reason:
Poor device (non-linearity of bearing). Poor operation. Large torque load. Impact; large oscillation. Excessive speed; rapid acceleration and deceleration. Smooth and poor.
Measures:
View device approach. View load; rotation and temperature conditions. Drop oscillation. Correct the selection of the cage. Change the smoothing agent and smooth method.

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