1. Annealing
Annealing refers to the heat treatment process of slowly heating the metal to a certain temperature, keeping it at a certain temperature for a sufficient period of time, and then slowly cooling it (generally cooling with the furnace). Its purpose is to reduce the hardness, improve machinability; eliminate residual stress, stabilize the size, reduce deformation and cracking tendency; refine the grain, adjust the organization, eliminate organizational defects, is a metal heat treatment process. At the same time, annealing is divided into general annealing and bright annealing. General annealing is in the absence of protective gas annealing; and bright annealing is in the state of protective gas annealing.
2, online bright solid solution
Online bright solid solution refers to the stainless steel heated to about 1100 ℃ solid melting state constant temperature to maintain, so that the carbide is completely or basically dissolved, and then quickly cooled to room temperature, in order to get the carbon supersaturated solid solution of the heat treatment process. This process will improve the toughness and corrosion resistance, stress relief and softening, in order to continue processing or molding. Solid solution is generally used in the pipe fittings have mechanical properties requirements of the product, that is to say, online solid solution is the production of stainless steel pipe fittings when a process, in order to follow the pipe fittings bending molding, flaring, shrinkage and other processes.