A redox protection device for stainless steel tube heat treatment furnace

Abstract

The invention discloses a redox protection device for a stainless steel tube heat treatment furnace, which belongs to the technical field of gas protection for heat treatment furnace devices, and includes a heat treatment furnace, a hydrogen storage tank, a helium storage tank, a hydrogen pipeline, a helium pipeline and a control circuit; The storage tank is connected to the A inlet of the three-way valve through the hydrogen pipeline; the helium storage tank is connected to the B inlet of the three-way valve through the helium pipeline; the outlet end of the three-way valve is connected to the heat treatment furnace; the connection between the three-way valve and the hydrogen storage tank An electric gate valve A and an electric regulating valve are arranged in sequence on the hydrogen pipeline between them; an electric gate valve B is arranged on the helium pipeline; the control loop includes a feedback control system for controlling the oxygen content in the furnace, a feedforward control system for controlling the hydrogen flow in the hydrogen pipeline, and Split-range control system, through the comprehensive regulation of three control systems, the invention can ensure that the stainless steel tube will not be oxidized during heat treatment, ensure the economical use of hydrogen according to the oxygen content in the furnace, and eliminate the possibility of hydrogen explosion.

Description

technical field [0001] The invention relates to the technical field of gas protection for heat treatment furnace devices, in particular to an oxidation-reduction protection device for a stainless steel tube heat treatment furnace. Background technique [0002] Austenitic stainless steel is a special steel containing a variety of alloying elements. Whether it is a steel pipe manufactured by hot extrusion or cold drawing, it will change the original uniform austenite structure. In order to restore the original grain structure, it is necessary to heat-treat the formed stainless steel pipe to restore the austenite structure. During the heating and heat preservation process of the stainless steel pipe, if the oxygen component in the air enters the surface, black scale will appear. In order to make the workpiece brighter and silvery white and improve the smoothness of the substrate, the ideal state is to heat-treat the steel pipe in a vacuum furnace. The biggest advantage of vacu...

AI Technical Summary

Problems solved by technology

When the amount of hydrogen in the heat treatment furnace accumulates too much, the combustion speed reaches the level of detonation and an explosion will occur. If the amount of hydrogen is too small, the protection and reduction effect on the stainless steel surface will be weakened, and the product quality will decline.

In addition, prior art methods cannot fundamentally avoid the danger of explosion, and from time to time, large or small heat treatment furnace explosions occur

Images