Unlock instant, AI-driven research and patent intelligence for your innovation.

A continuous pickling method and pickling liquid for medium-high chromium stainless steel cold-rolled coils

A stainless steel, medium-high chromium technology, applied to the continuous pickling production method of medium-high chromium stainless steel cold-rolled coils and the field of pickling solution

Active Publication Date: 2021-05-18
BAOSTEEL DESHENG STAINLESS STEEL
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method also has the polluting gas NO x And environmental protection factors such as nitrate discharge and sludge landfill treatment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A continuous pickling method and pickling liquid for medium-high chromium stainless steel cold-rolled coils
  • A continuous pickling method and pickling liquid for medium-high chromium stainless steel cold-rolled coils
  • A continuous pickling method and pickling liquid for medium-high chromium stainless steel cold-rolled coils

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment is pickling of 304 austenitic stainless steel (SUS304 stainless steel) cold-rolled coils.

[0051] The steel coil is put on the production line by welding, and the concentration of each material of the mixed acid solution used for pickling in pickling I section 5 and pickling II section 6 is:

[0052]

[0053] The hydrogen peroxide concentration 10g / L in the spray mixed acid solution used in the spraying device 52,62 is composed, and the other is the same as the acid dipping and pickling mixed acid solution.

[0054] The temperature of pickling and pickling mixed acid solution and spray pickling mixed acid solution are both 50°C, and the pickling speed is 40m / min. After pickling, the macroscopic appearance of 304 stainless steel surface is as follows: Figure 4 shown.

[0055] Depend on Figure 4 It can be seen that the surface of the strip steel is white, smooth, pickled and clean, and the surface quality is good.

Embodiment 2

[0057] This embodiment is pickling of 430 ferritic stainless steel (SUS430 stainless steel) cold-rolled coils.

[0058] Steel coil is put into production line by welding, and the concentration of each substance in pickling I section 5 pickling pickling mixed acid solution is:

[0059]

[0060] The concentration of hydrogen peroxide in the composition of the spray mixed acid solution in the first stage of pickling is 30g / L, and the others are the same as the pickling solution.

[0061] The concentration of each substance in pickling II section 6 pickling pickling mixed acid solution is:

[0062]

[0063] The concentration of hydrogen peroxide in the composition of the pickling second-stage spraying mixed acid solution is 30g / L, and the others are the same as the pickling and pickling mixed acid solution.

[0064] The temperature of acid leaching mixed acid solution and spray mixed acid solution in the first stage of acid solution is 45°C, the temperature of acid leaching...

Embodiment 3

[0067] This embodiment is pickling of 443 ferritic stainless steel (SUS443 stainless steel) cold-rolled coils.

[0068] The steel coil is welded on the production line, and the concentration of each substance in the pickling and pickling mixed acid solution of mixed pickling I section 5 and mixed pickling II section 6 is:

[0069] Steel coil is put into production line by welding, and the concentration of each substance in pickling I section 5 pickling pickling mixed acid solution is:

[0070]

[0071] The concentration of hydrogen peroxide in the composition of spraying acid solution for the pickling stage is 30g / L, and the others are the same as the mixed acid solution for pickling and pickling.

[0072] The concentration of each substance in pickling II section 6 pickling pickling mixed acid solution is:

[0073]

[0074] The concentration of hydrogen peroxide in the composition of the pickling second-stage spraying mixed acid solution is 30g / L, and the others are th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A continuous pickling method and pickling liquid for medium-high chromium stainless steel cold-rolled coils, including annealing, electrolysis, scouring, pickling, cleaning and drying processes. In the pickling process, pickling is performed first, and then acid is sprayed. Washing; pickling and pickling in mixed acid solution: sulfuric acid 10~80g / L; hydrofluoric acid 5~60g / L; hydrogen peroxide 0~30g / L; Fe 3+ 30~50g / L; 0<Fe 2+ ≤30g / L, the balance is water; in the mixed acid solution of spray pickling: sulfuric acid 10~80g / L; hydrofluoric acid 0~40g / L; hydrogen peroxide 10~50g / L; Fe 3+ 30~50g / L; 0<Fe 2+ ≤30g / L; the balance is water. This method does not contain nitric acid, no nitrogen emissions, and does not need to go through the electrification section. Wastewater discharge meets environmental protection requirements. The corrosion resistance of the produced medium and high chromium (chromium content >16%) stainless steel is the same as that of traditional stainless steel. The method is equivalent, the surface quality of the steel plate after pickling is good, and the corrosion resistance is equivalent to the traditional pickling method.

Description

Technical field [0001] The invention belongs to the field of stainless steel pickling, and specifically relates to a continuous pickling production method and pickling liquid of medium-high chromium stainless steel cold-rolled coils. Background technique [0002] Stainless steel cold-rolled coils have high-temperature oxidation during the annealing process, and an oxide layer is formed on the surface, which will affect its processing surface quality and processing performance. Therefore, the oxide layer must be removed before subsequent production and use. In the large-scale production process, the annealing and pickling of stainless steel cold-rolled coils are connected together to form a combined annealing and pickling unit. The pickling process mainly includes the electrolysis section, the electrochemical section and the mixed acid pickling section. [0003] The electrolysis section uses sodium sulfate as the electrolyte. Under the action of the electrode, the surface of ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/08
CPCC23G1/086
Inventor 彭建国潘世华魏文杰沈继程余海峰
Owner BAOSTEEL DESHENG STAINLESS STEEL