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Galvannealed sheet steel and method for production thereof

A technology of hot-dip galvanized steel sheet and manufacturing method, which can be applied to manufacturing tools, hot-dip galvanizing process, heat treatment equipment, etc., and can solve the problem of not necessarily sliding

Inactive Publication Date: 2003-06-11
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, when we form this kind of oxide film on the coating surface of alloyed hot-dip galvanized steel sheet, good sliding properties may not be obtained

Method used

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  • Galvannealed sheet steel and method for production thereof
  • Galvannealed sheet steel and method for production thereof
  • Galvannealed sheet steel and method for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] On a cold-rolled steel sheet with a thickness of 0.8mm, the ordinary alloying hot-dip galvanizing method is used to form a deposition amount of 60g / m2 according to the specified Fe concentration. 2 After temper rolling, the following treatments A and B were performed on the surface of the steel sheet to form oxide layers with different thicknesses, and sample No.1-20 was made. At this time, the reduction load of the temper rolling was changed so as to change the area ratio of the protrusions on the surface of the plating layer flattened by the temper rolling.

[0054] i) Process A

[0055] The alloyed hot-dip galvanized steel sheet is dipped into sulfuric acidic hydrogen peroxide aqueous solutions with pH 3, temperature 50°C and different hydrogen peroxide concentrations.

[0056] ii) Process B

[0057] The alloyed hot-dip galvanized steel sheet is dipped into the sulfuric acidic sodium nitrate aqueous solution with a pH of 2 and a temperature of 50°C, and the cathodi...

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Abstract

The invention provides a galvannealed steel sheet which has an oxide layer having 10 nm or larger thickness on the plateau of the coating layer flattened by temper rolling. With the use of the galvannealed steel sheet, no powdering occurs during press-forming, and stable and excellent sliding performance is attained. By selecting the area percentage of the plateau of the flattened coating layer to a range from 20 to 80 %, making the coating layer single layer of delta 1 phase, and letting zeta phase exist in the delta 1 phase, further improved sliding performance and anti-powdering property are obtained.

Description

technical field [0001] The invention relates to an alloyed hot-dip galvanized steel sheet with good sliding properties during stamping and a manufacturing method thereof. Background technique [0002] Compared with non-alloyed galvanized steel sheets, alloyed hot-dip galvanized steel sheets have better weldability and paintability, and are used in a wide range of fields centering on automobile bodies. However, when the alloyed hot-dip galvanized steel sheet is press-formed, the sliding resistance of the part clamped by the die and the boss (ビ一ド) becomes larger, and it is difficult to flow into the die, that is, the sliding property is not good, and it is inferior to the ordinary cold-rolled steel sheet. easy to break. [0003] The alloyed hot-dip galvanized steel sheet undergoes heat treatment after galvanizing, and the Fe in the steel sheet and the Zn in the coating layer diffuse to form a Fe-Zn alloy phase. This alloy phase is usually composed of Γ phase, δ1 phase, and ζ...

Claims

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Application Information

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IPC IPC(8): C23C2/26C23C2/28
CPCC23C2/26C21D1/673Y10S428/926C23C2/28C23C22/53Y10T428/1259Y10T428/12611Y10T428/12993Y10T428/12583Y10T428/12618Y10T428/12799C21D8/0278C21D8/0226C23G1/02C23C2/06C23C2/40C21D8/02
Inventor 平章一郎杉本芳春稻垣淳一妹川透野村修二樱井理孝山下正明佐藤馨名越正泰蒲昭宫川洋一野出俊策岩渊正洋
Owner JFE STEEL CORP
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