Oxidation-reduction protector of stainless steel pipe thermal treatment furnace

Abstract

The invention discloses an oxidation-reduction protector of a stainless steel pipe thermal treatment furnace and belongs to the technical field of gas protection of thermal treatment furnace devices.The oxidation-reduction protector comprises a thermal treatment furnace, a hydrogen storage tank, a helium storage tank, a hydrogen pipeline, a helium pipeline and a control loop, wherein the hydrogenstorage tank is connected with the inlet A of a three-way valve through the hydrogen pipeline; the helium storage tank is connected with the inlet B of the three-way valve through the helium pipeline; the outlet end of the three-way valve communicates with a thermal treatment furnace; an electric brake valve A and an electric adjusting valve are sequentially arranged on the hydrogen pipeline between the three-way valve and the hydrogen storage tank; an electric brake valve B is arranged on the helium pipeline; the control loop comprises a feedback control system for controlling oxygen contentin the furnace, a feedforward control system for controlling the flow gate of hydrogen in the hydrogen pipeline and a split control system; through comprehensive adjustment and control of the three control systems, the oxidation-reduction protector can ensure that the stainless steel pipe is not oxidized during the thermal treatment process and ensures hydrogen application economy according to the oxygen content in the furnace to 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

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