The heat treatment after the cold deformed metal is heated below the recrystallization temperature to remove the internal stress, but still retain the cold hardening effect, is called stress relief annealing.
In actual production, the application of the stress relief annealing process is much broader than the above definition. Hot forging, casting, various cold deformation processing, cutting or cutting, welding, heat treatment, and even assembly of machine parts The process of heating the component at a lower temperature to remove (all or part of) the internal stress and reduce the tendency of deformation and cracking can be called stress relief annealing. Due to the differences in material composition, processing method, internal stress magnitude and distribution, and differences in the degree of removal, the stress relief annealing temperature range is very wide. Conventionally, the stress-relieving treatment at a higher temperature is called stress-relief annealing, and the treatment at a lower temperature is called stress-relief tempering, which is basically the same.
Stress relief annealing, also known as low temperature annealing, mainly eliminates residual stresses in castings, forgings, welded parts, cold stamping parts and machining. The process is to slowly heat the workpiece to the stress relief process temperature, hold it for a period of time, and then follow the furnace Cooling heat treatment process. The stress-relief heating temperature is generally low. It is suitable for blanks and cut parts. It can eliminate residual stress in the blanks and parts, stabilize the size and shape of the workpiece, and reduce the deformation and crack tendency of the part during cutting and use. .
The shell of the stress relief annealing furnace is made of profile steel and steel plate into a square structure. The structure type is similar to the trolley type annealing furnace. It can be designed and manufactured according to different stress relief annealing temperatures. This series of furnace-type furnace body has precise structure and strict manufacturing process of heat insulation layer. It adopts standard heating elements and adopts automatic microcomputer process automatic temperature control system to make the temperature in the furnace extremely uniform. The stress-relief annealing process is freely programmable, and the heating rate, temperature and time are automatically controlled, and the temperature control accuracy reaches ± 1 ° C.
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