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Efficient acid pickling surface treatment method for high-strength automobile steel series strip steel

A surface treatment and automotive steel technology, applied in laser welding equipment, metal material coating technology, manufacturing tools, etc., can solve the problems of blackening of the board surface, under-pickling, over-pickling, and affecting the economic profit of steel types, etc., to achieve Reduce the chance of speckling, reduce the concentration of Cl-, reduce the effect of over pickling defects

Inactive Publication Date: 2018-12-18
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the high strength of high-strength automotive steel, pickling is difficult, and the surface is prone to blackening, under-pickling, over-pickling, and other defects, which cause the product to be reclassified and downgraded. Seriously affect the economic profit of the steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for high-efficiency pickling surface treatment of high-strength automotive steel series strip steel, the steps are as follows:

[0025] (1) Material preparation: strip steel with a yield strength of 500-800MPa produced by continuous casting and rolling; during the welding process of the strip steel, use a welding machine with a laser source power of 2.7KW for preheating and annealing;

[0026] (2) Pickling operation: Put pickling agent and corrosion inhibitor in the pickling tank, among which, the volume ratio of corrosion inhibitor and pickling agent is 1.75:1000; the use of corrosion inhibitor can effectively prevent pickling operation residual H + Corrosion of strip steel metal matrix, alleviate defects such as strip steel surface blackening, under pickling, over pickling in the pickling process; said pickling tank is provided with five, total length 125m, pickling speed is 225m / min, The temperature of the acid solution in the pickling tank is 77.5°C;

[0...

Embodiment 2

[0031] A method for high-efficiency pickling surface treatment of high-strength automotive steel series strip steel, the steps are as follows:

[0032] (1) Material preparation: strip steel with a yield strength of 500-800MPa produced by continuous casting and rolling; during the welding process of the strip steel, use a welding machine with a laser source power of 1.8KW for preheating and annealing;

[0033] (2) Pickling operation: Put pickling agent and corrosion inhibitor in the pickling tank, wherein, the volume ratio of corrosion inhibitor and pickling agent is 0.5:1000; the use of corrosion inhibitor can effectively prevent pickling operation residual H + Corrosion of the metal matrix of the strip steel, reducing defects such as blackening, under-pickling, and over-pickling of the strip steel surface during the pickling process;

[0034] (3) Rinsing operation: The pickled steel strip is rinsed through the rinsing tank. During the rinsing process, the desalted water is a...

Embodiment 3

[0038] A method for high-efficiency pickling surface treatment of high-strength automotive steel series strip steel, the steps are as follows:

[0039] (1) Material preparation: strip steel with a yield strength of 500-800MPa produced by continuous casting and rolling; during the welding process of the strip steel, a welding machine with a laser source power of 3.6KW is used for preheating and annealing;

[0040] (2) Pickling operation: Put pickling agent and corrosion inhibitor in the pickling tank, wherein, the volume ratio of corrosion inhibitor and pickling agent is 3:1000; the use of corrosion inhibitor can effectively prevent pickling operation residual H + Corrosion of the metal matrix of the strip steel, reducing defects such as blackening, under-pickling, and over-pickling of the strip steel surface during the pickling process;

[0041] (3) Rinsing operation: The pickled steel strip is rinsed through the rinsing tank. During the rinsing process, the desalted water is...

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Abstract

The invention provides an efficient acid pickling surface treatment method for high-strength automobile steel series strip steel. The efficient acid pickling surface treatment method comprises the steps that material preparation is conducted, in the welding process of strip steel which is produced through continuous casting and continuous rolling, small power is used for preheating and annealing,wherein the yield strength of the strip steel is in the level of 500-800 MPa; acid pickling work is conducted, and a corrosion inhibitor and an acid pickling agent with the volume ratio being 0.5-3:1000 are placed in an acid pickling tank; rinsing work is conducted, desalted water in rinsing tanks is added in the rinsing tanks in a gradient acceleration method, and the volume ratio of a passivatorto the desalted water is 0.5-2:1000; and after the strip steel obtained after acid pickling is flattened, rolling is conducted after a tension leveler is used for correcting the plate shape, and a finished product is obtained. The efficient acid pickling surface treatment method for the high-strength automobile steel series strip steel has the beneficial effects that usage is convenient, strip steel surface blacking, insufficient acid pickling and excessive acid pickling can be effectively improved, and the strip steel quality is improved.

Description

technical field [0001] The invention belongs to the technical field of steel strip surface treatment, in particular to a method for high-efficiency pickling surface treatment of high-strength automobile steel series strip steel. Background technique [0002] Due to the high strength of high-strength automotive steel, pickling is difficult, and the surface is prone to blackening, under-pickling, over-pickling, and other defects, which cause the product to be reclassified and downgraded. Seriously affect the economic profit of the steel. Contents of the invention [0003] In view of this, the present invention provides a method for high-efficiency pickling surface treatment of high-strength automotive steel series strip steel, specifically a high-strength automotive steel series strip with a yield strength of 500-800 MPa grade suitable for thin-gauge continuous casting and rolling production Method for high-efficiency pickling surface treatment of steel. The method for hig...

Claims

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Application Information

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IPC IPC(8): C23G1/08C23G1/04C23C22/00B23K26/00
CPCC23G1/08B23K26/00C23C22/00C23G1/04
Inventor 王春龙吴修蕾邓先儒石进王慧凯李远旭周洪宝刘训民
Owner RIZHAO STEEL HLDG GROUP
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