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Briefly describe the precautions for annealing and cooling of high-precision cold drawn tubes
When producing and processing high-precision cold-drawn tubes, in order to achieve better strength and hardness, attention should be paid to the details of each link during annealing and cooling to achieve good results.
Concerning the cooling of this product during production, the technical requirements applied here are very high. If the temperature is not well controlled, thermal stress and organizational stress will occur, which may cause the steel pipe to crack or warp.
High precision cold drawn tubeDuring mechanical processing, deformation will occur due to the redistribution of internal stress, which cannot guarantee the accuracy of processing. In addition, when processing large parts, residual stress is easily generated inside them. These products require stress relief after rough machining.
During cooling, the surface and some sections often produce white, white and hard and brittle structures, which are not good for cutting and easy to use when peeling off. Therefore, ordinary products must be annealed to eliminate casting defects. The annealing or normalizing temperature is mostly between 850-950°C. The temperature is maintained for 1-2 hours, and cementite is synthesized into graphite and austenite. During the subsequent furnace cooling period, secondary cementite and eutectoid cementite will be synthesized into graphite. Subsequently, ferrite or ferrite matrix is ??added with pearlite, thus reducing the hardness and strength of the casting. If the wear resistance of the product is required, heating, insulation without furnace and use of air cooling are required. In addition to the cement cementation process at 850-950°C, the synthesis time of cementite is cooled during the normalization process, which can reduce the productOf hardness, a pearlite matrix can also be obtained, attached with specific strength and hardness.
Above,High precision cold drawn tubeDuring cooling, if you want to produce high-quality products, you must strictly control all aspects.