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Hot-dip galvanized steel sheet

A hot-dip galvanized steel sheet, hot-dip galvanizing technology, applied in hot-dip coating process, heat treatment furnace, heat treatment equipment, etc. Corrosion durability and other issues

Active Publication Date: 2015-10-07
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, sufficient consideration has not been given to the durability of the product, such as the coating adhesion of the processed part after the press work, and the corrosion resistance after the press work.
[0006] As mentioned above, the present situation is that it is difficult to obtain a durable steel sheet with excellent coating adhesion after stamping and good corrosion resistance after stamping and painting.

Method used

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  • Hot-dip galvanized steel sheet

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Embodiment

[0078] Hereinafter, the present invention will be specifically described based on examples. It should be noted that the present invention is not limited to the following examples.

[0079] It has the steel composition shown in Table 1, and is coiled at the coiling temperature (CT) shown in Table 2 (in this specification, both Table 2-1 and Table 2-2 are referred to as Table 2) to produce a hot-rolled steel sheet . Next, with respect to the obtained hot-rolled steel sheet, black scale was removed by pickling. Next, the hot-rolled steel sheets having a plate thickness of 2.3 mm and 4.5 mm were cold-rolled at rolling reduction rates of 65% and 60%, respectively, so that the plate thicknesses were 0.8 mm and 1.8 mm. Then, the surface was subjected to degreasing pretreatment on the inlet side of the CGL (continuous hot-dip galvanizing line), annealed under the conditions shown in Table 2, and hot-dip galvanized to manufacture hot-dip galvanized steel sheets. Appropriate changes ...

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Abstract

The purpose of the present invention is to provide a hot-dip galvanized steel sheet that, after press work, has excellent plating adhesion, excellent spot-welding properties, and excellent corrosion resistance after coating, and has an excellent external appearance after coating. The hot-dip galvanized steel sheet has a steel sheet, a hot-dip galvanized layer, and an intermetallic compound. The steel sheet has, in mass%, 0.03%-0.70% C, no more than 0.10% Si, 0.5%-0.9% Mn, 0.020%-0.050% P, no more than 0.010% S, 0.010%-0.035% Nb, no more than 0.005% N, and no more than 0.10% Al, with the remainder being Fe and unavoidable impurities. The hot-dip galvanized layer includes 0.3%-0.6% Al. The intermetallic compound includes 0.12-0.22 gm-2 Al and includes Fe2Al5 having an average particle diameter of no more than 1 µm.

Description

technical field [0001] The present invention relates to a hot-dip galvanized steel sheet that is used in the fields of automobiles, home appliances, building materials, and the like, and is particularly suitable for use as outer panels and inner panels of automobiles. Background technique [0002] In recent years, in the fields of automobiles, home appliances, building materials, etc., surface-treated steel sheets in which rust resistance has been imparted to raw steel sheets have been used. Among the above-mentioned surface-treated steel sheets, it is preferable to use a hot-dip galvanized steel sheet excellent in rust resistance. In particular, European and American automakers consider improving the rust resistance of raw steel sheets by applying hot-dip galvanized steel sheets that simply increase the coating thickness. In addition, in East Asia, where economic growth is remarkable, the situation is that there is expected to be a large demand for steel sheets for automob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C22C18/04C22C38/00C22C38/12C23C2/40C21D9/46
CPCC22C38/12B32B15/013C21D8/0278C21D9/46C22C18/04C22C38/00C22C38/001C22C38/02C22C38/04C22C38/06C23C2/06C23C2/28C23C2/40B32B15/012Y10T428/12993Y10T428/12951Y10T428/12958Y10T428/12965Y10T428/12972Y10T428/12757Y10T428/12611Y10T428/12618Y10T428/1259Y10T428/27Y10T428/26Y10T428/263Y10T428/264Y10T428/12799C23C2/29
Inventor 铃木善继宫田麻衣长泷康伸
Owner JFE STEEL CORP
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