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An environmentally friendly stainless steel hot-rolled coil continuous annealing and pickling production method and pickling liquid

A production method and stainless steel technology, applied in the field of environmentally friendly stainless steel hot-rolled coil continuous annealing pickling production method and pickling solution, can solve the problems of steel corrosion resistance decline, easy to appear yellow spots on the surface, etc., achieve good quality, solve belt Decreased steel corrosion resistance, the effect of meeting emission requirements

Active Publication Date: 2021-05-18
BAOSTEEL DESHENG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an environment-friendly production method and pickling liquid for continuous annealing and pickling of stainless steel hot-rolled coils, so as to solve the problems in the prior art that macula easily appear on the surface of stainless steel hot-rolled coils after pickling and the corrosion resistance of steel decreases. Moreover, the pickling solution does not contain nitric acid, which meets the requirements of the new environmental protection law, and at the same time realizes efficient and rapid production of stainless steel

Method used

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  • An environmentally friendly stainless steel hot-rolled coil continuous annealing and pickling production method and pickling liquid
  • An environmentally friendly stainless steel hot-rolled coil continuous annealing and pickling production method and pickling liquid
  • An environmentally friendly stainless steel hot-rolled coil continuous annealing and pickling production method and pickling liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This example is pickling of duplex and austenitic stainless steel hot rolled coils.

[0042] The steel coil is welded on the production line, and the concentration of each substance in the pickling I section 5 and the pickling II section 6 of the mixed acid solution is:

[0043]

[0044] In this embodiment, the pickling additive is the pickling accelerator SUNSPEED produced by Shanghai Beishan Chemical Co., Ltd.

[0045] The concentration of hydrogen peroxide in the spray acid solution used in the spray devices 52 and 62 is 10g / L, and the others are the same as above.

[0046] The temperature of the mixed acid solution and the spray acid solution are both 50°C, and the pickling speed is 55m / min. The macroscopic appearance of the SUS304 stainless steel surface after pickling is as follows: Figure 4 shown.

[0047] 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

[0049] This example is the pickling of 400 high-chromium ferritic stainless steel hot-rolled coils.

[0050] The steel coil is welded on the production line, and the concentration of each substance in the mixed acid solution of the mixed pickling I section 5 and the mixed pickling II section 6 is:

[0051]

[0052] In this embodiment, the pickling additives are 1.5 g / L pickling accelerator SUNSPEED and 1.5 g / L pickling corrosion inhibitor HIBIRON produced by Shanghai Beishan Chemical Co., Ltd.

[0053] The concentration of hydrogen peroxide in the spray acid composition is 30g / L, and the others are the same as above.

[0054] The temperature of the mixed acid solution and the spray acid solution are both 45°C, and the pickling speed is 50m / min. The macroscopic appearance of the SUS439 stainless steel surface after pickling is as follows: Figure 5 shown.

[0055] Depend on Figure 5 It can be seen that the surface of the strip steel is white, smooth, pickled and clean, and...

Embodiment 3

[0057] This embodiment is the pickling of 400 low-chromium ferrite and martensitic stainless steel hot-rolled coils.

[0058] The steel coil is welded on the production line, and the concentration of each substance in the mixed acid solution of the mixed pickling I section 5 and the mixed pickling II section 6 is:

[0059]

[0060] The concentration of hydrogen peroxide in the spray acid composition is 50g / L, and the others are the same as above.

[0061] The temperature of the mixed acid solution and the spray acid solution are both 40°C, and the pickling speed is 50m / min. The macroscopic and microscopic appearance of the SUS409L stainless steel surface after pickling is as follows: Image 6 shown.

[0062] Depend on Image 6 It can be seen that the surface of the strip steel is white, smooth, pickled and clean, and the surface quality is good.

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Abstract

An environmentally friendly stainless steel hot-rolled coil continuous annealing and pickling production method and pickling liquid. The production method includes annealing, straightening treatment, shot blasting treatment, pre-pickling, and pickling. The pickling includes at least one pickling process. Washing, the main composition of the mixed acid liquid used in the acid pickling is: sulfuric acid 10~80g / L, hydrofluoric acid 0~40g / L, hydrogen peroxide 0~30g / L, 30~50g / L Fe 3+ ,0<Fe 2+ ≤30g / L, pickling additive 1~5g / L, the balance is water; the pickling also includes at least one spray pickling, and the spray pickling needs to be carried out after pickling and pickling, the spraying The main components of the spray acid used in pickling are: sulfuric acid 10~80g / L, hydrofluoric acid 0~40g / L, hydrogen peroxide 10~50g / L, 30~50g / L Fe 3+ ,0<Fe 2+ ≤30g / L, pickling additive 1~5g / L, the balance is water. The present invention adopts a combination of pickling and spray pickling, combined with improved formulas of pickling and spraying acid, to effectively solve technical problems such as yellow spots on the surface of the strip and a decrease in the corrosion resistance of the strip, and satisfies the new environmental protection requirements. legal requirements.

Description

technical field [0001] The invention belongs to the technical field of stainless steel annealing and pickling, and in particular relates to an environment-friendly production method for continuous annealing and pickling of stainless steel hot-rolled coils and a pickling solution. Background technique [0002] Stainless steel hot-rolled coils have high-temperature oxidation during the production process, and the oxide layer formed on the surface will affect the quality of the processed surface and processing performance, so it must be removed before subsequent production and use. In the large-scale production process, the pickling and annealing of stainless steel hot-rolled coils are combined to form an annealing and pickling unit. The pickling process mainly includes mechanical descaling, pre-pickling and mixed acid pickling. [0003] Mixed acid pickling mainly utilizes FeO, Fe in the pickling solution and scale 3 o 4 , Fe 2 o 3 、Cr 2 o 3 , NiO and SiO 2 And other sub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/08
CPCC23G1/086
Inventor 彭建国周磊磊沈继程余海峰
Owner BAOSTEEL DESHENG STAINLESS STEEL
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