In the field of stainless steel pipes, there are two main types: stainless steel welded pipes and stainless steel seamless pipes. Stainless steel welded pipes are welded by straight seam welding after the steel strip is curled and formed by the unit and die; In contrast, stainless steel seamless pipes are made of round steel perforated into tube embryos as raw materials and then made by cold rolling, cold drawing, or self-pressing production processes. However, in the process of producing both types of stainless steel pipes, solid solution treatment is required.
Stainless steel pipes
The purpose of solid solution annealing of stainless steel pipes is mainly two: first, to eliminate work hardening, which is conducive to subsequent processing, such as bending and flaring. Through solid solution annealing, the distortion in the lattice is restored, the extended and broken crystals will recrystallize, the internal stress is eliminated, the tensile strength of the steel pipe is reduced, and the elongation is increased.
Secondly, the corrosion resistance of stainless steel itself is restored. Since carbide precipitation and lattice defects may occur during cold working, the corrosion resistance of stainless steel pipes is reduced. After solid solution annealing, the corrosion resistance of stainless steel pipes will be restored to the best state. Typically, stainless steel tubes used in heat exchangers and condensers need to be solution annealed to meet actual application requirements.

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