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Hot-dip galvanized steel sheet and manufacturing method thereof

A hot-dip galvanized steel sheet, hot-dip galvanized technology, applied in the hot-dip galvanized process, manufacturing tools, heat treatment furnaces, etc., can solve the problem of inability to manufacture hot-dip galvanized steel sheets with peeling resistance of the coating, and achieve the peeling resistance of the coating excellent effect

Active Publication Date: 2011-10-19
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to achieve such control in the conventional technology, and it is impossible to produce a heat treatment with excellent coating peeling resistance during high processing using a high-strength steel sheet containing Si as the base material on a CGL equipped with a full-radiant tubular heating furnace as an annealing furnace. Dip galvanized steel

Method used

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  • Hot-dip galvanized steel sheet and manufacturing method thereof
  • Hot-dip galvanized steel sheet and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment

[0090] Hereinafter, the present invention will be specifically described based on examples.

[0091] The hot-rolled steel sheets with the steel compositions shown in Table 1 were pickled to remove black scale, and then cold-rolled under the conditions shown in Table 2 to obtain cold-rolled steel sheets with a thickness of 1.0 mm.

[0092] Table 1

[0093]

[0094] The cold-rolled steel sheet obtained above was loaded into a CGL having a full-radiant tubular heating furnace as an annealing furnace. In CGL, Po of the annealing atmosphere is controlled in the manner shown in Table 2 2 The plate was passed through a furnace, heated to 850°C with a heating belt, annealed by soaking at 850°C with a soaking belt, and then hot-dip galvanized in a Zn bath containing Al at 460°C. It can be considered that the atmosphere in the annealing furnace, including the heating furnace and the soaking furnace, is basically uniform. In addition, the oxygen partial pressure and temperature wer...

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Abstract

The hot-dip galvanized steel sheet has a galvanized layer formed on the surfaces of steel sheet which contains, in mass%, C: 0.01- 0.15%, Si: 0.001-2.0%, Mn: 0.1-3.0%, Al: 0.001-1.0%, P: 0.005-0.060%, S ? 0.01%, and the remainder of which comprises Fe and inevitable impurities. The quantity of adhesion per surface in the galvanized layer is 20-120 g / m2. There is a total of 0.05 g / m2 or less per surface of one or more kinds of oxides selected from those of Fe, Si, Mn, Al, and P inside the surface layer portion of the steel sheet no more than 100 [mu]m deep from the base steel sheet surface directly below the galvanized layer. The steel sheet has excellent corrosion resistance, resistance to galvanized coat peeling with a high degree of processing, and strength.

Description

technical field [0001] The present invention relates to a hot-dip galvanized steel sheet, which uses a steel sheet containing Si and Mn as a base material, has excellent corrosion resistance and workability, and has high strength, and a method for producing the same. Background technique [0002] In recent years, in the fields of automobiles, home appliances, building materials, etc., surface-treated steel sheets that impart rust resistance to base steel sheets, especially hot-dip galvanized steel sheets that can be produced at low cost and have excellent rust resistance, are used. Alloyed hot-dip galvanized steel sheet. In addition, from the standpoint of rising fuel costs of automobiles and improving the crash safety of automobiles, there is an increasing demand for reducing the weight and increasing the strength of the vehicle body itself by increasing the strength of the vehicle body material to achieve thinner walls. Therefore, the application of high-strength steel sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C21D9/46C22C38/00C22C38/06C22C38/58C23C2/02C23C2/28
CPCC21D6/005C21D6/008C21D9/46C22C38/02C22C38/04C22C38/06C23C2/06C23C2/28Y10T428/12757C23C2/0038C23C2/0224C23C2/022
Inventor 伏胁祐介杉本芳春
Owner JFE STEEL CORP
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