Introduction of annealing treatment process for stainless steel welded pipe
The welding process of stainless steel welded pipe is not only fast in heating but also fast in cooling. Under such severe temperature change environment, welding stress will be generated, and the welding structure of the stainless steel welded pipe will also change. In order to ensure the performance of the welded pipe, it is necessary to eliminate the difference in microstructure between the weld and the base material through heat treatment.
Stainless steel welded pipe annealing
So, how to heat treat stainless steel welded pipe? Huaheng Stainless Steel tells you that there are two heat treatment processes for stainless steel welded pipes, namely annealing and normalizing. The so-called annealing refers to eliminating the welding stress state and work hardening phenomenon, and improving the welding plasticity of the stainless steel welded pipe. Generally, the heating temperature is below the phase transition point. Normalizing, as a normalizing process, improves the non-uniformity of the mechanical properties of stainless steel welded pipes, brings the mechanical properties of the base metal and the weld metal close, improves the metal microstructure, refines the grains, and points above the phase transition point The heating temperature is cooled. According to different requirements of stainless steel welded pipe, normalizing can be divided into welding heat treatment and overall heat treatment.