| ? ? ? ? Precision steel pipe is used for manufacturing mechanical structure, hydraulic equipment, automobile parts and steel sleeve. The commonly used materials are 10 กม 10, 20 กม 10, 35 กม 10, 45 กม 10, 20Cr, 40Cr, 20CrMo, 16Mn, 27SiMn, 304, 201, 310S, high-quality carbon structural steel.
? ? ? Precision tube features 1. Smaller outer diameter. 2. High precision, can be used for small batch production. 3. High precision and good surface quality of cold drawn products. 4. The cross area of steel pipe is more complex. 5. The performance of steel pipe is superior and the metal is relatively dense. According to the tempering temperature range of brittleness, it can be divided into low temperature temper brittleness and high temperature temper brittleness.
? ? ? ? Before welding, the Wuxi precision steel pipe is preheated to the post heat treatment temperature, and the weldment is continuously heated to maintain this temperature during the welding process. After the welding is completed, the heat preservation cotton is used to keep it cool slowly. Quenching can increase the strength and hardness of steel pipe, but reduce its plasticity. The quenchants commonly used in quenching are water, oil, alkali water and salt solution.
? ? ? ? Tempering of precision steel pipe reheats the quenched Wuxi precision steel pipe to a certain temperature, and then cools it by a certain method, which is called tempering. The purpose is to eliminate the internal stress produced by quenching, reduce the hardness and brittleness, and obtain the expected mechanical properties. Tempering can be divided into high temperature tempering, medium temperature tempering and low temperature tempering. Tempering is usually used with quenching and normalizing. Quenching and tempering treatment the heat treatment method of high temperature tempering after quenching is called quenching and tempering treatment.