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

Active Publication Date: 2018-10-26
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Here, for GI, the surface activity is particularly low

Method used

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  • Method for producing galvanized steel plate
  • Method for producing galvanized steel plate
  • Method for producing galvanized steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0066] The present invention is further described in detail through examples.

[0067] Hot-dip galvanizing was performed by a conventional method on a steel sheet having a thickness of 0.7 mm and annealed after cold-rolling, and an alloying treatment was performed on a part after hot-dip galvanizing. Next, temper rolling is performed. Adjust the amount of galvanizing to 45g / m on each side 2 , the Fe content of the plated film after the alloying treatment was adjusted to 10% by mass. After temper rolling, dip in an acidic solution containing 30 g / L sodium acetate and a pH of 1.5 in an acidic solution tank and lift it up. Adjust the amount of liquid film. HF in acidic solution 2 Na, HF 2 The concentration of K was set at 0 to 10.00 g / L, and the liquid temperature was set at 35°C. The amount of liquid film is adjusted by changing the pressure of the squeeze roller. After adjusting the amount of the liquid film, leave it (hold) for 1 to 30 seconds, then spray warm water at ...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34C23C28/00C23C2/06C23C2/28C23C4/08
CPCC23C22/34C23C2/26C23C2/06C23C22/83C23C2/40C23C2/02C23C22/82
Inventor 星野克弥古谷真一松田武士土本和明松崎晃
Owner JFE STEEL CORP
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