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Atmosphere replacement system of continuous annealing furnace

A continuous annealing furnace and annealing furnace technology, applied in furnaces, heat treatment furnaces, furnace types, etc., can solve the problems of excessive production capacity of continuous annealing lines, uneven organization and performance, affecting production scheduling, etc., to improve economic efficiency and The efficiency of workshop use, avoiding the staged shutdown of equipment, and improving the efficiency of utilization

Inactive Publication Date: 2015-07-08
WISDRI WUHAN WIS IND FURNACE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Atmosphere replacement system of continuous annealing furnace
  • Atmosphere replacement system of continuous annealing furnace
  • Atmosphere replacement system of continuous annealing furnace

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The vertical continuous annealing furnace suitable for the atmosphere replacement system in this embodiment includes an inlet seal 1, a heating section 2, a transition section 3, a cooling section 9, a turning device 6 and a channel 7, an outlet seal 8, and a cooling section 9. A gas replacement system 4 and a protective atmosphere circulation system 5 installed on the heating section 2 .

[0034]When the vertical continuous annealing furnace produces steel strips, the furnace uses a mixture of hydrogen and nitrogen (hydrogen gas volume ratio 99.99%) as the protective atmosphere; Furnace temperature, when the furnace temperature in each zone of the annealing furnace drops to 800°C, use the gas replacement system 4 to carry out nitrogen purge to gradually replace the hydrogen and nitrogen mixed gas protective atmosphere in the furnace with nitrogen, and then use high-purity (volume fraction 99.99%) Argon purging, gradually replacing the nitrogen protective atmosphere in ...

Embodiment 2

[0039] The vertical continuous annealing furnace applicable to the atmosphere replacement system in this embodiment includes an inlet seal 1, a heating section 2, a transition section 3, a cooling section 9, a steering device and a channel 7, an outlet seal 8, the heating section is a muffle furnace, and the heating section There are muffle tubes 10, a gas replacement system 4 and a protective atmosphere circulation system 5 arranged on the cooling section 9.

[0040] When the vertical continuous annealing furnace produces steel strips, the furnace uses a mixture of hydrogen and nitrogen (80% hydrogen by volume) as a protective atmosphere; Furnace temperature, when the furnace temperature in each zone of the annealing furnace drops to 800°C, use nitrogen purge to gradually replace the hydrogen-nitrogen mixture protective atmosphere in the furnace with nitrogen, and then purge with high-purity (volume fraction 99.99%) argon, Gradually replace the protective atmosphere in the fu...

Embodiment 3

[0046] The horizontal continuous annealing furnace applicable to the atmosphere replacement system in this embodiment includes an inlet seal 1, a preheating section 2, a heating section 3, a cooling section 4, an outlet sealing 5, a gas replacement system 6 arranged on the heating section, and a gas circulation system 7 and air cushion air supply system 8. The horizontal continuous annealing furnace is equipped with an air-cushion gas supply system 8, and the nozzles of the air-cushion gas supply system are arranged staggered up and down to ensure that the suspension height of the annealed strip is suitable and the operation is stable; and the nozzle wind speed of the air-cushion gas supply system is adjustable. , adjust the wind speed according to the thickness and tension of the annealed strip to ensure the buoyancy and heat of the annealed strip; the air cushion gas supply system is connected with the external inert protective gas supply system, and the titanium strip is pro...

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Abstract

The invention relates to an atmosphere replacement system of a continuous annealing furnace. The atmosphere replacement system is characterized by being suitable for the continuous annealing furnace for annealing a titanium band and a steel band. The continuous annealing furnace comprises a heating section, a transition section and a cooling section, wherein sealing systems are arranged before the heating section and after the cooling section, and protective atmospheres in each section of furnace are communicated with each other; the protective atmosphere replacement system is communicated with an external protective gas supply system and is used for finishing the protective atmosphere replacement in the continuous annealing furnace during the interconversion between a stainless steel band annealing mode and a titanium band annealing mode, rapidly replacing protective atmospheres of the different zones in the furnace with protective atmospheres required for process according to process requirements and finishing the adjustment and replacement of the protective atmospheres in the furnace. The atmosphere replacement system is used for replacing the protective atmospheres of the continuous annealing furnace for annealing the titanium band and the stainless steel band when the titanium band or the steel band is replaced for annealing under the condition of ensuring the using safety of the continuous annealing furnace and the annealing quality of the titanium band and the stainless band.

Description

technical field [0001] The invention belongs to a protective atmosphere replacement system for titanium strips and stainless steel strips annealed in a continuous annealing furnace, in particular to a protective atmosphere replacement system for the continuous annealing furnace used for annealing titanium strips and stainless steel strips when replacing titanium strip annealing and stainless steel strip annealing system. 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 strengthening the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/56C21D1/74C21D1/26
Inventor 杨谦李卫杰
Owner WISDRI WUHAN WIS IND FURNACE