Method for producing galvanized steel plate

A galvanized steel sheet and a manufacturing method, which are applied in the directions of fusion spraying, hot-dip plating, superimposed layer plating, etc., can solve problems such as low surface activity, and achieve reduced friction coefficient, good stretchability, Low sliding resistance effect
CN108713071AActive Publication Date: 2018-10-26JFE STEEL CORP
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
JFE STEEL CORP
Publication Date
2018-10-26

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Abstract

Provided is a method for producing a galvanized steel plate having exceptional press moldability. This method is provided with: an oxide layer formation step in which a galvanized steel plate is heldfor 1-60 seconds after being brought into contact with an acidic solution, then washed with water; and a neutralization step in which the surface of the zinc oxide layer formed in the oxide layer formation step is held for 0.5 second or longer in a state of contact with an alkaline aqueous solution, then washed with water and dried. The acidic solution contains a total of 0.10-5.0 g / L inclusive ofHF2Na and / or HF2K.
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Description

technical field

[0001] The present invention relates to a method for producing a galvanized steel sheet having low sliding resistance during press forming and excellent press formability. Background technique

[0002] Galvanized steel sheets are widely used in various fields centering on automobile body applications, and in such applications, they are pressed and formed for use. However, galvanized steel sheets have a disadvantage of poor press formability compared with cold-rolled steel sheets. The reason for this is that the sliding resistance of the galvanized steel sheet in the pressing die is higher than that of the cold-rolled steel sheet. In the parts where the sliding resistance is high in the die and the bead, the galvanized steel sheet becomes difficult to flow into the pressing die, and the steel sheet tends to break.

[0003] Especially in hot-dip galvanized steel sheets (hereinafter sometimes referred to as GI), there is a phenomenon that the sliding resistanc...

Claims

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