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Cold-rolled stainless steel annealing and pickling process, and pickling equipment

A cold-rolled stainless steel, pickling technology, applied in heat treatment equipment, metal material coating process, manufacturing tools, etc., can solve the problems of high acid consumption, high power consumption, speed up cleaning speed, etc., to reduce acid temperature, improve Pickling efficiency, energy saving effect

Active Publication Date: 2021-11-02
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current pickling process has the disadvantages of high acid consumption, high frequency of brush roller replacement, and high power consumption.
[0004]In addition, the pickling conditions for cold-rolled stainless steel strip are relatively harsh, and pickling takes a long time. Therefore, it is urgent to develop high-efficiency pickling equipment and processes to slow down the temperature High-concentration chemical reagents pollute the environment, speed up cleaning and obtain strips with high surface quality

Method used

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  • Cold-rolled stainless steel annealing and pickling process, and pickling equipment

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Experimental program
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Effect test

Embodiment 1

[0026] This embodiment provides a cold-rolled stainless steel annealing and pickling process. The pickling process allows the high-temperature strip to directly enter the pickling tank for pickling by controlling the temperature of the strip steel at the exit of the annealing furnace, and cancels the drying device at the exit of the annealing furnace. Descaling process and mechanical brushing device in the pickling section, and through the cascade overflow continuous pickling process system without nitric acid and hydrofluoric acid, the rapid cleaning of strip steel can be realized, and energy consumption and acid consumption can be reduced at the same time to obtain high surface quality The strip steel specifically comprises the following steps:

[0027] Step 1), after the cold-rolled stainless steel enters the annealing furnace to adjust the composition, by adjusting the cooling capacity of the cooling section of the annealing furnace, the temperature of the cold-rolled stain...

Embodiment 2

[0040] refer to figure 1 , which is a kind of pickling equipment for realizing the cold-rolled stainless steel annealing pickling process of the above-mentioned embodiment 1, including a strip steel conveying device (not shown in the figure) and uncoilers arranged in sequence along the traveling direction of the strip steel 23 Machine 1, welding machine 2, looper 3, annealing furnace 4, heat preservation chamber 5, temperature control device, pre-cleaning tank 9, electrolytic tank 10, 1# acid tank 12, 2# acid tank 16, passivation tank 18, rinse tank 20 and dryer 22.

[0041] Among them, the temperature control device is provided with a fan 6 and a heater 7, the temperature of the strip steel can be regulated by controlling the power of the fan and heater 7, and a plate temperature instrument 8 is also installed on the temperature control device to detect and control the temperature of the strip steel. Steel plate temperature; electrolyte circulation tank 11 is connected to el...

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Abstract

The invention relates to a cold-rolled stainless steel annealing and pickling process, and pickling equipment. According to the pickling process, the temperature of strip steel at an outlet of an annealing furnace is controlled, so that the high-temperature strip steel is in direct contact with a low-temperature pickling solution, strong physical and chemical reactions are generated on the surface of the high-temperature strip steel, and thick scale on the surface layer is rapidly stripped through pickling; the pickling efficiency is increased by regulating and controlling the oxidation-reduction characteristic of the pickling solution in a cascade overflow continuous pickling system so as to efficiently remove the residual scale on austenite, ferrite and martensitic stainless steel; and according to the process, the residual heat of the annealing furnace is fully utilized, the temperature of the pickling solution is reduced, the energy consumption is reduced, and the purpose of low-consumption and high-efficiency pickling for the cold-rolled stainless steel strip steel is realized.

Description

technical field [0001] The invention relates to the technical field of steel strip surface cleaning, in particular to a cold-rolled stainless steel annealing pickling process and pickling equipment. Background technique [0002] The surface quality of stainless steel is one of the key factors affecting the improvement of product performance. A layer of dense metal oxide film will be formed on the surface of cold-rolled stainless steel strip during rolling, which will seriously reduce the surface quality of cold-rolled stainless steel strip and aggravate the wear of rolls. [0003] After the cold-rolled stainless steel strip is annealed and mechanically broken, the pickling process for austenitic stainless steel is Na 2 SO 4 (Electrolytic) pickling → scrubbing → mixed acid (HNO 3 +HF) pickling, the pickling process of ferrite and martensite is Na 2 SO 4 (Electrolytic) pickling → scrubbing → HNO 3 (Electrolytic) pickling, followed by multi-stage rinsing and drying. The ...

Claims

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Application Information

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IPC IPC(8): C23G1/08C25F1/06C23C22/73C21D1/26C21D9/573C23G3/02
CPCC23G1/08C25F1/06C23C22/73C21D1/26C21D9/573C23G3/027Y02P10/20
Inventor 王耀廖砚林周云根贾鸿雷李春明吴迪青
Owner WISDRI ENG & RES INC LTD
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