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A kind of phosphating cold-rolled steel strip and its manufacturing method

A manufacturing method and technology of cold-rolled strip, applied in manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problem of affecting the quality of the upper film and the service life of the phosphating agent, affecting the adhesion and corrosion resistance of the paint film, and phosphating treatment. Problems such as complex process flow, to achieve the effect of improving phosphating effect and efficiency, improving formation speed and uniform density, and ensuring cleanliness

Active Publication Date: 2021-04-13
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two main problems. First, after the workpiece is processed and formed, due to the limitation of its geometric size and shape, there will inevitably be dead corners such as grooves that are not easy to clean, which will affect the effect of degreasing and washing, and will hinder The formation of phosphating film, and even after the film is applied, it will affect the adhesion and corrosion resistance of the subsequent paint film. At the same time, it is easy to cause cross grooves between the degreasing tank and the phosphating tank, affecting the quality of the film and the use of phosphating agent Second, phosphating treatment involves the discharge of carcinogenic pollutants such as phosphating wastewater and waste residue. Improper treatment will cause serious environmental pollution. In addition, the phosphating process is complicated and energy-consuming, which brings many problems to customers. stress and inconvenience

Method used

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  • A kind of phosphating cold-rolled steel strip and its manufacturing method
  • A kind of phosphating cold-rolled steel strip and its manufacturing method
  • A kind of phosphating cold-rolled steel strip and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The chemical composition of steel for oil barrels is: C 0.030%, Mn 0.40%, Si 0.01%, Al 0.05%, P 0.018%, S 0.0035%, and the balance is Fe and impurity elements.

[0037] The strip steel whose chemical composition meets the above requirements is subjected to conventional treatments such as decoiling, welding, degreasing cleaning, annealing, leveling and tension leveling on the continuous annealing line. was 1.4%. After the treatment, enter the phosphating treatment area, first enter the phosphating section for phosphating treatment, the phosphating section adopts a spray process, the pH value of the phosphating solution is 2.2, the phosphating time is 41s, and the temperature of the phosphating solution is 42°C. The phosphating solution is composed of the following components: zinc dihydrogen phosphate 80g / L, zinc nitrate 69g / L, phosphoric acid 15g / L, sodium chlorate 1.9g / L, tartaric acid 5.8g / L, sodium fluoride 1.5g / L, sulfuric acid Hydroxylamine 2.2g / L, phytic acid 1.7...

Embodiment 2

[0041] The chemical composition of steel for oil barrels is: C 0.040%, Mn 0.20%, Si 0.018%, Al 0.027%, P 0.005%, S 0.011%, and the balance is Fe and impurity elements.

[0042]The strip steel whose chemical composition meets the above requirements is subjected to conventional treatments such as decoiling, welding, degreasing cleaning, annealing, leveling and tension leveling on the continuous annealing line. was 1.1%. After the treatment, enter the phosphating treatment area, first enter the phosphating section for phosphating treatment, the phosphating section adopts a spray process, the pH value of the phosphating solution is 2.8, the phosphating time is 49s, and the temperature of the phosphating solution is 45°C. The phosphating solution is composed of the following components: zinc dihydrogen phosphate 65g / L, zinc nitrate 78g / L, phosphoric acid 11g / L, sodium chlorate 1.3g / L, tartaric acid 6.8g / L, sodium fluoride 1.9g / L, sulfuric acid Hydroxylamine 1.1g / L, phytic acid 1.2...

Embodiment 3

[0046] The chemical composition of steel for oil barrels is: C 0.035%, Mn 0.30%, Si 0.04%, Al 0.01%, P 0.012%, S 0.0047%, and the balance is Fe and impurity elements.

[0047] The steel strip whose chemical composition meets the above requirements is subjected to conventional treatments such as uncoiling, welding, degreasing cleaning, annealing, leveling and tension leveling on the continuous annealing line. was 1.2%. After the treatment, enter the phosphating treatment area, first enter the phosphating section for phosphating treatment, the phosphating section adopts a spraying process, the pH value of the phosphating solution is 2.5, the phosphating time is 49s, and the temperature of the phosphating solution is 48°C. The phosphating solution is composed of the following components: zinc dihydrogen phosphate 97g / L, zinc nitrate 52g / L, phosphoric acid 18g / L, sodium chlorate 3.0g / L, tartaric acid 5.4g / L, sodium fluoride 1.2g / L, sulfuric acid Hydroxylamine 1.7g / L, phytic acid ...

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Abstract

The invention provides a phosphating cold-rolled steel strip and its manufacturing method. The chemical composition of the steel strip includes: C0.01-0.10%, Mn0.1-0.6%, Si≤0.10%, Al≤0.10%, P≤0.02%, S≤0.015%, and the balance is Fe and impurity elements. In the present invention, phosphating treatment equipment is added between the leveling and straightening machine and the oiling machine of the continuous annealing unit, and the phosphating treatment equipment is composed of a phosphating section, a rinsing section and a drying box. After uncoiling, the strip steel enters the phosphating treatment area after conventional treatments such as welding, cleaning, annealing, leveling, and tension leveling. The strip steel after phosphating treatment is directly coiled into coils without oiling. The production of cold-rolled phosphating coils in the present invention can not only simplify the production process of customers, improve efficiency, but also improve the quality of phosphating, and solve the problem that incomplete degreasing and cleaning of customers' terminals affects the phosphating effect.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, in particular to a phosphating cold-rolled steel strip and a manufacturing method. Background technique [0002] Cold-rolled strip steel has the advantages of good surface finish, good flatness, high dimensional accuracy, and good mechanical properties. It can be used to make oil barrels and containers, and can also be used to manufacture building panels, office supply cabinets, and electronic machinery. However, after processing and forming and before coating, the cold-rolled strip steel needs to be phosphating. Surface phosphating treatment is an extremely important process in the manufacturing process of steel drums, such as steel coil uncoiling and blanking, stamping and forming of drum bottom cover, welding and forming assembly of drum body, surface phosphating, internal and external coating, etc. Phosphating is the process in which metal reacts with dilute phosphoric acid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C23C22/36C23C22/76C21D1/26C21D6/00C21D9/56
Inventor 李慧岳重祥朱阳林李化龙
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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