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Method for producing hot-dip galvanized steel sheet having excellent press formability and painting clarity, and hot-dip galvanized steel sheet produced thereby

A technology of hot-dip galvanized steel sheet and manufacturing method, which is applied in the direction of hot-dip galvanizing process, chemical instruments and methods, manufacturing tools, etc., which can solve problems such as hindering sharpness of image and different napping behaviors, so as to prevent coating from falling off and reduce sliding The effect of frictional resistance

Inactive Publication Date: 2019-07-30
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, in the above-mentioned Patent Document 1, even if the sum of the volumes of the concave portions per unit area of ​​the hot-dip galvanized steel sheet is adjusted to be more than a predetermined value, the oil content and frictional characteristics will appear depending on the shape of the surface irregularities. Exhibit very different hair-pulling behavior
In addition, in Patent Documents 2 to 4, even if the shape profile of the hot-dip galvanized steel sheet caused by the roughness imparted to the pass roll is removed by various methods, the original shape profile of the base material remaining in the plating layer after press forming is restored again. appear, and persist after painting, thereby hindering distinct image

Method used

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  • Method for producing hot-dip galvanized steel sheet having excellent press formability and painting clarity, and hot-dip galvanized steel sheet produced thereby
  • Method for producing hot-dip galvanized steel sheet having excellent press formability and painting clarity, and hot-dip galvanized steel sheet produced thereby
  • Method for producing hot-dip galvanized steel sheet having excellent press formability and painting clarity, and hot-dip galvanized steel sheet produced thereby

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Embodiment Construction

[0067] Hereinafter, the present invention will be described in more detail through examples. However, it should be noted that the following examples are only used to illustrate the present invention in more detail, and are not intended to limit the scope of rights of the present invention. This is because the scope of rights of the present invention is determined by the matters described in the claims and matters reasonably derived therefrom.

[0068] (Example)

[0069] A cold-rolled steel sheet having a composition composition of 0.002%C-0.003%Si-0.08%Mn-0.028%Al-0.0114%P-0.0052%S (weight %) was prepared as a base steel sheet, and then hot-dip galvanized so that all The coating adhesion on one surface of the cold-rolled steel sheet reaches 60g / m 2 , thus obtaining a hot-dip galvanized steel sheet.

[0070] After that, the temper rolling work roll ( work roll), the hot-dip galvanized steel sheet is temper-rolled with a rolling reduction force of 250 tons, so as to transfer...

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Abstract

The present invention relates to a hot-dip galvanized steel sheet used for an automobile exterior panel and so forth and, more specifically, to a method for producing a hot-dip galvanized steel sheethaving excellent press formability and painting clarity, and to a hot-dip galvanized steel sheet produced by the method.

Description

technical field [0001] The present invention relates to a hot-dip galvanized steel sheet used as an automobile outer panel, etc., and more specifically, to a method for manufacturing a hot-dip galvanized steel sheet excellent in press formability and coating distinctness of image, and a method for manufacturing a hot-dip galvanized steel sheet hot-dip galvanized steel sheets. Background technique [0002] Coated steel sheets, especially hot-dip galvanized steel sheets (GI) have excellent corrosion resistance, weldability, and paintability, so they are widely used as steel sheets for automobile outer panels, so they need to have excellent press formability and vivid coating sex. [0003] However, unlike alloyed hot-dip galvanized steel sheet (GA) in which fine unevenness is formed on the surface during the alloying process, the coating layer of hot-dip galvanized steel sheet is composed of pure zinc (η phase), so the surface after plating is smooth and thin film It is soft ...

Claims

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Application Information

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IPC IPC(8): C23C2/26C23C2/06C23C2/40B21B27/02B21B27/00B21B1/22
CPCB21B1/227B21B27/005B21B27/021C23C2/06C23C2/26C23C2/40Y10T428/12993B32B15/01B21B2001/228
Inventor 全选镐洪文憙朴埈奭蒋斗钻
Owner POHANG IRON & STEEL CO LTD
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