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Galvanized steel sheet

A technology of galvanized steel sheets and hot-dip galvanized steel sheets, which is applied in hot-dip galvanizing technology, coating, medical science, etc., can solve problems such as unstable stamping performance, and achieve the effect of small sliding resistance and excellent stamping formability

Inactive Publication Date: 2012-01-18
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, due to the high viscosity of lubricating oil, coating defects caused by poor degreasing occur in the coating process
In addition, there are problems such as unstable stamping performance due to oil cut-off during press forming

Method used

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  • Galvanized steel sheet
  • Galvanized steel sheet
  • Galvanized steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] On a cold-rolled steel plate with a thickness of 0.8mm, the coating adhesion is 60g / m2 formed by conventional alloying hot-dip galvanizing method 2 , Fe concentration of 10% by mass, Al concentration of 0.20% by mass of the plated film, and then temper rolling. In addition, at this time, the area ratio of the flat portion varies slightly depending on the cutting position, but is all within the range of 40 to 60%.

[0059] This alloyed hot-dip galvanized steel sheet was immersed in an aqueous solution to which zinc sulfate heptahydrate was added, and the amount of liquid film on the surface was controlled to 10 g / m with a rubber roller. 2 Thereafter, it is left in the air in this state, and after 10 to 60 seconds, an oxidation treatment of washing with water and drying is performed. In addition, for comparison, an aqueous solution to which zinc nitrate hexahydrate was added, or an acidic solution containing sodium acetate and ferrous sulfate was also used. The temperat...

Embodiment 2

[0088] Alloyed hot-dip galvanized steel sheets with a thickness of 1.2 mm and different steel sheet strengths are dipped in an aqueous solution (pH 5.5, temperature 35°C) to which zinc sulfate heptahydrate (concentration 20 g / L) is added, and rubber rollers are used. Control the amount of liquid film on the surface to 10g / m 2 Thereafter, it is left in the air in this state, and after 10 to 60 seconds, an oxidation treatment of washing with water and drying is performed. The alloyed hot-dip galvanized layer is formed by conventional alloying treatment, and the coating adhesion is 45-50g / m 2 , The plated film having an Fe content rate of 10 to 11% by mass is temper rolled so that the flat portion area ratio falls within the range of 40 to 60%.

[0089] Carry out the measurement of the oxide film thickness of the alloyed hot-dip galvanized steel sheet after oxidation treatment and 3Zn(OH) according to the method described in Example 1 2 ·ZnSO 4 ·3~5H 2 Analysis of O. In addi...

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Abstract

A zinc-based metal plated steel sheet excellent in tribological properties during press forming is provided. An oxide layer containing crystalline 3Zn(OH) 2 ZnSO 4 xH 2 O is formed on a plated surface. The oxide layer has a thickness of 10 nm or more. The crystalline oxide layer is composed of 3Zn(OH) 2 ZnSO 4 3-5H 2 O.

Description

[0001] The application number is 200880104271.4 (the international application number is PCT / JP2008 / 066276), the entry date of the Chinese national phase is February 24, 2010 (the international application date is September 3, 2008), and the invention name is "galvanized A divisional application of the Chinese patent application for "steel plate". technical field [0002] The present invention relates to a galvanized steel sheet having excellent sliding properties in press forming. Background technique [0003] Galvanized steel sheets are widely used in a wide range of fields centering on automobile body applications, and in such applications, they are used after being press-formed. However, the galvanized steel sheet has a disadvantage of poor press forming compared with the cold-rolled steel sheet. This is because the sliding resistance of the surface-treated steel sheet in the press die is larger than that of the cold-rolled steel sheet. That is to say, in the part wher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/53C23C2/26C25D5/48
CPCC23C2/26C23C22/53Y10T428/12792Y10T428/12611Y10T428/12799Y10T428/265Y10T428/12785C23C2/06C23C2/40A61F13/511A61F13/5116A61F13/51305A61F13/51401
Inventor 牧水洋一藤田荣吉见直人多田雅彦大塚真司增冈弘之星野克弥梶山浩志名越正泰谷本亘藤本京子
Owner JFE STEEL CORP