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Method for controlling surface appearance of hot-dip galvanized ultra-deep drawing steel for automobile panel

A technology of surface morphology and control method, which is applied in the field of metallurgy, can solve the problems of affecting the vividness of the paint, the decrease of the peak RPc, and the low soft strength, and achieve the advantages of promoting and applying, ensuring the cooling rate, and excellent deep drawing performance Effect

Active Publication Date: 2019-12-03
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hot-dip galvanized ultra-deep drawing steel, due to the low soft strength of the material, the rolling force in the rolling and skin pass process is small, resulting in a low copy coefficient of the textured work roll, and it is difficult to improve the surface roughness to obtain a high-grade surface morphology
If the surface roughness Ra is low, the bonding area between the steel strip and the paint film is small, which will lead to unfavorable phenomena such as poor adhesion of the paint film and peeling off; but if the roughness Ra is blindly increased, the peak value RPc will decrease, and the waviness Wsa will also decrease accordingly. The increase will affect the vividness of the paint and make the quality of the surface coating layer poor, which cannot meet the high surface quality requirements of automotive panels

Method used

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  • Method for controlling surface appearance of hot-dip galvanized ultra-deep drawing steel for automobile panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare hot-dip galvanized ultra-deep-drawn steel for automobile panels with high-grade surface morphology. The grade of the hot-dip galvanized ultra-deep-drawn steel is DX56D+Z. Zinc is obtained, and the specific steps are as follows:

[0019] 1) Smelting chemical composition and mass percentage: C 0.0018%, Si 0.003%, Mn 0.15%, P 0.011%, S 0.01%, Als 0.035%, Ti 0.080%, N 0.0031%, the rest is Fe and unavoidable impurities.

[0020] 2) Continuous acid rolling: the roll roughness Ra of the first to fourth stands of the rolling mill is 0.40 μm, 0.40 μm, 0.30 μm, and 0.60 μm respectively; The board roughness is 1.2 μm, and the peak value Rpc=90 pieces / cm.

[0021] 3) Hot-dip galvanizing process: the effective aluminum content in the zinc liquid composition is 0.24%, and the iron content is 0.005%; the temperature of the zinc liquid is 456°C; the speed of the steel strip passing through the zinc pot is 90mpm; the temperature of entering the hot-dip galvanizing zinc pot is 4...

Embodiment 2

[0023] Prepare hot-dip galvanized ultra-deep-drawn steel for automobile panels with high-grade surface morphology. The grade of the hot-dip galvanized ultra-deep-drawn steel is DX56D+Z. Zinc is obtained, and the specific steps are as follows:

[0024] 1) Smelting chemical composition and mass percentage: C 0.0025%, Si 0.020%, Mn 0.10%, P 0.012%, S 0.008%, Als 0.020%, Ti 0.055%, N 0.0025%, the rest is Fe and unavoidable impurities.

[0025] 2) Continuous acid rolling: the roll roughness Ra of the first to fourth stands of the rolling mill is 0.480 μm, 0.80 μm, 0.55 μm, and 0.30 μm respectively; the fifth stand roll roughness Ra=3.5 μm, chilled after acid rolling The plate roughness is 0.6 μm, and the peak value Rpc=92 pieces / cm.

[0026] 3) Hot-dip galvanizing process: the effective aluminum content in the zinc liquid composition is 0.21%, and the iron content is 0.003%; the temperature of the zinc liquid is 455°C; the speed of the steel strip passing through the zinc pot is 1...

Embodiment 3

[0028] Prepare hot-dip galvanized ultra-deep-drawn steel for automobile panels with high-grade surface morphology. The grade of the hot-dip galvanized ultra-deep-drawn steel is DX56D+Z. Zinc is obtained, and the specific steps are as follows:

[0029] 1) Smelting chemical composition and mass percentage: C 0.0012%, Si 0.008%, Mn 0.12%, P 0.007%, S 0.005%, Als 0.050%, Ti 0.070%, N 0.0040%, the rest is Fe and unavoidable impurities.

[0030] 2) Continuous acid rolling: the roll roughness Ra of the first to fourth stands of the rolling mill is 0.55 μm, 0.50 μm, 0.60 μm, and 0.40 μm respectively; Roughness is 0.6μm, peak value Rpc=95 pieces / cm.

[0031]3) Hot-dip galvanizing process: the effective aluminum content in the zinc liquid composition is 0.228%, and the iron content is 0.005%; the temperature of the zinc liquid is 456°C; the speed of the steel strip passing through the zinc pot is 110mpm; The inlet temperature of the top roll of the cold rolling tower is 170°C; the ang...

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Abstract

The invention discloses a method for controlling the surface appearance of hot-dip galvanized ultra-deep drawing steel for an automobile panel. The hot-dip galvanized steel strip comprises the following chemical components in percentage by mass: C is smaller than or equal to 0.0025%, Si is smaller than or equal to 0.020%, Mn is 0.10-0.15%, P is smaller than or equal to 0.012%, S is smaller than orequal to 0.010%, Als is 0.020-0.050%, Ti is 0.055-0.080%, N is smaller than or equal to 0.0040%, and the balance Fe and inevitable impurities. The manufacturing method comprises the steps of smelting, continuous casting, hot rolling, acid continuous rolling, hot galvanizing and the like. By controlling the production process, especially the process conditions of the cold continuous rolling stageand the hot galvanizing stage, the surface roughness and waviness of the hot galvanizing ultra-deep drawing steel can meet the requirements of automobile factories besides good tensile property.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for controlling the surface morphology of hot-dip galvanized ultra-deep drawing steel for automobile panels. Background technique [0002] Hot-dip galvanized ultra-deep drawing steel is mainly used for automobile outer covering parts. The consumption is large and the stamping parts are more complicated. The mechanical properties and surface appearance quality of the steel strip are very high. If a certain index is not met, dark spots will easily occur after stamping Cracks or wrinkles cannot meet the requirements of automotive exterior parts. Especially the surface morphology of hot-dip galvanized ultra-deep drawing steel, with the improvement of user aesthetics, the appearance after painting is one of the quality indicators that car users pay attention to. The quality of painted appearance is not only affected by the painting process itself , is also aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C23C2/06C23C2/40C23C2/20
CPCC22C38/001C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06C22C38/14C23C2/06C23C2/20C23C2/40
Inventor 康华伟高兴昌张磊
Owner SD STEEL RIZHAO CO LTD
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