Stainless steel wire, which is often used in stainless steel wire mesh, generally goes through drawing, annealing and other processes to meet the needs of production and processing. So what is the bright annealing principle of stainless steel wire? Today, Suzhou jinruier Electric Furnace Co., Ltd. will discuss the principle of bright annealing of stainless steel wire with you.

In the process of cold drawing, the microstructure and mechanical properties of steel wire change, resulting in work hardening. With the increase of cold drawing deformation process, the tensile strength, hardness and elastic limit of general steel wire increase, while the elongation and reduction of area decrease. Due to the phenomenon of work hardening, when the deformation of drawing reaches a certain degree, the cold workability of steel wire will obviously decline, and it is not suitable to continue drawing. At this time, intermediate heat treatment is needed to restore various workability of steel wire. This process of intermediate heat treatment is called annealing.

Bright annealing of stainless steel wire is to use liquid ammonia to obtain the mixture of hydrogen and nitrogen containing 75% hydrogen and 25% nitrogen. Hydrogen is a reducing agent, which has strong reducibility at high temperature. It can reduce the black oxide on the surface of steel wire, so as to restore its original appearance. It is a bright color on the surface of steel wire. In addition, hydrogen can also prevent the steel wire from further oxidation under high temperature, so as to protect the steel wire. Tubular annealing furnace

The purpose of annealing stainless steel wire is to reduce its hardness, improve machinability, eliminate residual stress, stabilize size, reduce deformation and crack tendency, refine grain, adjust structure and eliminate structural defects. Also has is the steel wire surface bright function.