Vertical continuous annealing furnace rapid blowing out method

Abstract

The invention relates to a vertical continuous annealing furnace rapid blowing out method. The vertical continuous annealing furnace rapid blowing out method is mainly used for technical problems in the prior art that furnace inside atmosphere replacing and furnace temperature reducing process is slow in vertical continuous annealing furnace blowing out, and blowing out time is relatively long. The vertical continuous annealing furnace rapid blowing out method comprises following steps: 1, a hydrogen flow valve is turned off; 2, a transition material is delivered into a vertical continuous annealing furnace, wherein the running speed of the transition material in the vertical continuous annealing furnace is controlled to be 280 to 350mpm; 3, furnace temperature is reduced step by step, wherein in a first period, the temperature of the vertical continuous annealing furnace is set to be 500 DEG C when the weld joints of a normal material and the transition material reach a final cooling segment, in a second period, the temperature of the vertical continuous annealing furnace is reduced to 500 DEG C, running of strip steel in the vertical continuous annealing furnace is stopped, and the temperature of the vertical continuous annealing furnace is set to be 300 to 400 DEG C; and 4, furnace covers are removed step by step. Technical control of the vertical continuous annealing furnace rapid blowing out method is simple, blowing out time of vertical continuous annealing furnaces is shortened effectively, and rapid blowing out of the vertical continuous annealing furnaces is realized.

Description

technical field [0001] The invention relates to the technical field of continuous annealing furnaces, in particular to a method for rapid shutdown of a vertical continuous annealing furnace. Background technique [0002] The continuous annealing furnace is used to recrystallize and anneal the work-hardened strip steel after cold rolling, improve the microstructure, improve plasticity and stamping formability, and ensure that the surface is not oxidized. After continuous annealing combines several separate processes of bell annealing into one unit, the production cycle is shortened from the original 10 days to at most one hour, the production material preparation is greatly reduced, the production process is simplified, the management is convenient, and the productivity is greatly improved. [0003] The vertical continuous annealing furnace is mainly used for the annealing production of tin-plated raw plates. The strip steel in the furnace is protected from oxidation by a mix...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for quickly shutting down a vertical continuous annealing furnace to solve the problem of slow furnace atmosphere replacement and lower furnace temperature and longer shutdown time in the prior art when the vertical continuous annealing furnace is shut down technical problem