The main difference between seamless steel pipe annealing and non-annealing lies in their organizational structure, hardness, machinability, and corrosion resistance. Structural organization and performance transformation: After the seamless steel pipe undergoes annealing treatment, its organizational structure will change. For example, annealing can reduce the hardness of the steel pipe, increase plasticity, enhance machinability, and corrosion resistance. While the steel pipe that has not been annealed may have higher hardness and strength, but it is difficult to process and handle. Annealing types: The annealing of seamless steel pipe includes full annealing, spheroidizing annealing, stress-relief annealing, etc. Full annealing aims to reduce the hardness of seamless steel pipe and eliminate the non-uniform organization and internal stress in the steel. For spheroidizing annealing, the seamless steel pipe needs to be heated to 750 degrees, held for a period of time and ...
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