For the manufacture of stainless steel seamless pipes, the corresponding annealing treatment is carried out after each cold drawing. The purpose of annealing: reduce hardness and improve machinability. Eliminate residual stress, stabilize dimensions, reduce deformation and cracking tendency. Refine grains, improve organization, and eliminate organization defects. Homogenize material organization and composition, improve material properties, and prepare for subsequent heat treatment. Stainless steel seamless steel pipe 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 ℃, and the air-cooled heat treatment process is called stress relief seamless steel pipe annealing.
The seamless steel pipe annealing furnace adopts the intermediate frequency heating device, which is specially designed for the seamless steel pipe continuous annealing furnace. According to its characteristics of heating in motion and the characteristics of the heated workpiece being a seamless steel pipe, the parameters of the intermediate frequency power supply and the inductor are designed in the system. Special design, the whole set of seamless steel pipe annealing furnace production line equipment system is controlled by a separate power supply, and the performance is stable.
The ratio of the inner diameter of the induction coil formed by the seamless steel pipe 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 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, the vibration resistance and integrity are good.
Post time: Jul-07-2022