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Heat treatment plant said the steel parts will be heated to 80~200 degrees, heat insulation 5~20 hours or longer, and then take out the furnace cooling in the air. Objective: to reduce the deformation during the quenching of 1 stable steel parts, reduce the deformation during storage and use, and reduce the internal stress, stable shape and size of the quenching and grinding after grinding. 2. Application points: 1. Apply to the quenching of the steel; 2. Commonly used to shape no longer occur close workpiece changes, such as tight screw, measuring tools, machine chassis, and so on.

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