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
CN1423708AInactive Publication Date: 2003-06-11JFE STEEL CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
JFE STEEL CORP
Publication Date
2003-06-11
Estimated Expiration
Not applicable · inactive patent

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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.
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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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