Atmosphere replacement method for continuous annealing furnace

Abstract

The invention relates to an atmosphere replacement method for a continuous annealing furnace. The atmosphere replacement method is characterized in that protective atmosphere replacement is finished in a mutual conversion between a stainless steel belt annealing mode and a titanium belt annealing mode in the continuous annealing furnace by means of a protective atmosphere replacement system arranged in the furnace body of the continuous annealing furnace, and the protective atmosphere in the furnace is quickly replaced to a required protective atmosphere in the furnace according to process requirements so as to adjust the protective atmosphere in the furnace; the protective atmosphere replacement system is communicated with an external protective gas supply system; and the protective atmosphere in the furnace can be flexibly replaced to mixed atmosphere of hydrogen and nitrogen or argon atmosphere according to production requirements so as to meet the stainless steel belt annealing and titanium belt annealing demands. A titanium belt and a stainless steel belt are annealed on a continuous annealing line, so that no special annealing furnace is constructed for annealing and producing titanium belts.

Description

technical field [0001] The invention belongs to the method for replacing the protective atmosphere when titanium strips and stainless steel strips are annealed in a continuous annealing furnace, in particular to the protective atmosphere replacement method for the continuous annealing furnace used for annealing titanium strips and stainless steel strips when replacing titanium strip annealing and stainless steel strip annealing Methods. Background technique [0002] The annealing treatment in the existing titanium plate production process mostly adopts vacuum roll annealing, vacuum roll annealing is periodic annealing, and the annealing cycle is long, because in the process of vacuum annealing, the outer, middle and center parts of the titanium plate are heated unevenly, making the plate The structure and performance uniformity of the inner and outer rings are poor. At present, many processes improve the heating effect of the titanium plate during the annealing process by s...

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Problems solved by technology

[0004] The continuous annealing of titanium plate is protected by argon atmosphere, and the stainless steel plate is annealed by full hydrogen atmosphere protection. After the titanium plate is rolled on the existing steel production line, the continuous annealing furnace of the steel production line cannot continuously anneal the titanium plate. If it is specially built, it can be used The continuous annealing line for titanium plate annealing requires a huge investment, and because the demand for titanium plates is small, the production capacity of the continuous annealing line is prone to excess, which leads to the problem of phased shutdown of the continuous annealing furnace. The economy is poor, and it may be affected by the layout of the furnace area. Production Scheduling, etc.

[0005] In order to overcome the problems of inhomogeneous microstructure and properties and surface quality defects of titanium plates in vacuum coil annealing, and to avoid the huge investment and excess production capacity caused by the construction of a new continuous annealing furnace for titanium strips, a new method for titanium strips and titanium strips was proposed. Stainless steel continuous annealing furnace with annealing, can be used for continuous annealing of titanium and stainless steel plates

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