For the manufacture of seamless steel tubes, the corresponding annealing treatment must be carried out after each cold drawing.
Purpose of annealing:
1. Reduce hardness and improve machinability.
2. Eliminate residual stress, stabilize size, and reduce deformation and cracking tendency.
3. Refine the grains, improve the structure, and eliminate the defects of the structure.
4. Homogenize the material structure and composition, improve the material properties, and prepare for the subsequent heat treatment. The seamless steel tube annealing furnace is to heat the steel pipe to a temperature slightly higher than Ac1, and after holding for a certain period of time, it is cooled to 550℃～600℃. The air-cooled heat treatment process is called stress relief seamless steel tube annealing.
The seamless steel tube annealing furnace adopts an intermediate frequency heating device, which is specially designed for a seamless steel tube continuous annealing furnace. According to the characteristics of heating in motion and the characteristics of the workpiece being heated as a seamless steel tube, the parameters of intermediate frequency power supply and inductor are designed in the system. Special design, the whole set of seamless steel tube annealing furnace production line equipment system is controlled by a separate power supply, and the performance is stable.
The manufacturing process of seamless steel tube annealing furnace inductor:
The ratio of the inner diameter of the induction coil to the outer diameter of the workpiece is within a reasonable range and is designed according to the process parameters of the induction heating furnace provided by the user. The inductor coil is made of a large-section T2 rectangular copper tube through the main processes of annealing, winding, pickling, hydrostatic testing, baking, drying, knotting, assembly, etc., and then fixed as a whole, the entire inductor is completed. After being formed into a rectangular parallelepiped, its vibration resistance and integrity are good. Both ends of the inductor are protected by copper plates at the mouth of the water-cooled furnace, which can effectively prevent electromagnetic radiation from harming operators.
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