In the production of large-diameter elbows in stainless steel seamless elbows, there are generally steps to increase the hardness. When the hardness of the stainless steel seamless elbow increases, heat treatment is required. The elbow is heated to a certain temperature and kept for a period of time, and it is gradually cooled, which is called annealing.
The annealing process of stainless steel seamless elbows is to heat the workpiece to a temperature at which a phase transition or partial phase transition occurs, and then slowly cool it after heat preservation. Annealing can eliminate structural defects, improve the structure, homogenize the composition and refine the grain, improve the mechanical properties of the hot-pressed elbow, and reduce the residual stress. In addition, the annealing of the stainless steel seamless elbow can also reduce its hardness and improve plasticity and toughness, as well as improving cutting performance, so annealing is not only to eliminate and improve the remaining structural defects and combined stress in the previous process, but also to prepare for the follow-up work.
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