Hot-dip galvanized steel sheet
A hot-dip galvanized steel sheet, hot-dip galvanizing technology, applied in the direction of hot-dip galvanizing process, coating, chemical instruments and methods, etc., can solve the problems of insufficient consideration of coating adhesion, corrosion resistance, durability, etc., and achieve excellent coating Adhesiveness, excellent corrosion resistance, and excellent appearance after painting
Active Publication Date: 2015-07-01
JFE STEEL CORP
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Problems solved by technology
However, in Patent Document 1, the durability of the product, such as the plating adhesion of the processed part after the press working and the corrosion resistance after the press working, is not considered sufficiently.
Method used
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Embodiment
[0078] Hereinafter, the present invention will be described by way of examples. In addition, this invention is not limited to the following Example.
[0079] The black scale of the hot-rolled steel sheet composed of the steel composition shown in Table 1 was removed by pickling, cold-rolled at a rolling ratio of 75%, and then the surface was treated at the entrance side of the CGL (continuous hot-dip galvanizing line). After the degreasing pretreatment, annealing was performed at the annealing temperature shown in Table 2 in an annealing furnace, and hot-dip galvanizing was performed under the conditions described in Table 2. The average cooling rate at 420 to 400° C. after plating and wiping was also measured. The cooling rate is also shown in Table 2. It is to be noted that the steel sheet was lifted from the coating bath, and after adjusting the amount of coating deposited by air jet wiping, SK treatment was performed under the conditions shown in Table 2 before cooling. ...
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Abstract
Provided is a hot-dip galvanized steel sheet which not only exhibits excellent adhesion of a deposit even after press working but also ensures excellent post-coating corrosion resistance even after press working and which has excellent surface appearance. According to the present invention, the structure of a zinc deposit is controlled, said zinc deposit being formed by hot-dip galvanizing, while an intermetallic compound with prescribed characteristics is formed at a deposit / steel sheet interface. Further, the solidification structure of the deposit and the surface texture thereof are controlled. Specifically, the amount of Al in the deposit is adjusted to 0.3 to 0.6% by mass. Further, the amount of Al in the intermetallic compound is adjusted to 0.12 to 0.22gm-2, and the mean particle diameter of the intermetallic compound is adjusted to 1μm or less, while the composition of the intermetallic compound is Fe2Al5 and / or FeAl3.
Description
technical field [0001] The present invention relates to a hot-dip galvanized steel sheet that can be suitably used for 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 to which rust resistance has been imparted to raw steel sheets have been used, among which hot-dip galvanized steel sheets having excellent rust resistance are used. In particular, carmakers in Europe and the United States consider improving rust resistance 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 automobiles. [0003] In addition, in the case of a steel sheet for automobiles in which good workability is strictly required, the durability of the product cannot be maintained if ...
Claims
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IPC IPC(8): C23C2/06C22C18/04C22C38/00C22C38/14
CPCC22C38/02C22C38/004C22C38/04B32B15/013C22C18/00C22C38/14C23C2/06C22C18/04C22C38/06C22C38/12C22C38/001C22C38/00C22C38/002C23C2/40
Inventor 铃木善继宫田麻衣长泷康伸
Owner JFE STEEL CORP