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High-strength hot-dip galvanized steel plate and method for producing same

A technology of hot-dip galvanized steel sheet and manufacturing method, which is applied to manufacturing tools, hot-dip galvanizing process, heat treatment furnace, etc., and can solve the problem of not being able to pass through a fully radiant tube heating furnace.

Active Publication Date: 2014-03-12
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to perform such control with the existing technology, and the CGL equipped with a full-radiant tube heating furnace in the annealing furnace cannot use Si-containing high-strength steel sheets as the base material to produce hot-dip coatings with excellent coating peeling resistance during high-load processing. Zinc steel plate

Method used

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  • High-strength hot-dip galvanized steel plate and method for producing same
  • High-strength hot-dip galvanized steel plate and method for producing same
  • High-strength hot-dip galvanized steel plate and method for producing same

Examples

Experimental program
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Effect test

Embodiment 1

[0127] Hereinafter, the present invention will be specifically described based on examples.

[0128] A hot-rolled steel sheet having a steel composition shown in Table 1 was pickled to remove black scale, and then cold-rolled under the conditions shown in Table 2 to obtain a cold-rolled steel sheet with a thickness of 1.0 mm.

[0129]

[0130] The cold-rolled steel sheet obtained as above was loaded into the CGL equipped with the full radiant tube heating furnace among the annealing furnaces. In CGL, as shown in Table 2, the steel sheet is passed through under the conditions of controlling the dew point in the temperature range of 750°C or higher in the heating furnace as shown in Table 2, and after annealing, it is carried out using a Zn bath containing Al at 460°C. Hot-dip galvanized treatment.

[0131] It should be noted that the gas components in the atmosphere consist of nitrogen, hydrogen, and unavoidable impurities, and the dew point is controlled by absorbing and r...

Embodiment 2

[0163] The hot-rolled steel sheets having the steel compositions shown in Table 3 were pickled to remove black scale, and then cold-rolled under the conditions shown in Table 4 to obtain cold-rolled steel sheets with a thickness of 1.0 mm.

[0164]

[0165] The cold-rolled steel sheet obtained as above was loaded into the CGL equipped with the full radiant tube heating furnace among the annealing furnaces. In CGL, as shown in Table 4, the steel sheet is passed through under the conditions of controlling the dew point in the temperature range of 600°C or higher in the heating furnace as shown in Table 4, and after annealing, it is carried out using a Zn bath containing Al at 460°C. Hot-dip galvanized treatment.

[0166] It should be noted that the gas components in the atmosphere consist of nitrogen, hydrogen, and unavoidable impurities, and the dew point is controlled by absorbing and removing moisture in the atmosphere. The hydrogen concentration in the atmosphere is base...

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Abstract

There is provided a method for producing a high-strength hot-dip galvanized steel sheet including a steel sheet containing, in percent by mass, 0.01% to 0.18% of C, 0.02% to 2.0% of Si, 1.0% to 3.0% of Mn, 0.001% to 1.0% of Al, 0.005% to 0.060% of P, 0.01% or less of S, and the balance being Fe and incidental impurities, and a galvanized coating layer on each surface of the steel sheet with a coating weight of 20 to 120 g / m 2 per surface, in which, when the steel sheet is subjected to annealing and a hot-dip galvanizing treatment in a continuous hot-dip galvanizing line, the dew point of the atmosphere is controlled to -40°C or lower in the annealing furnace temperature range of 750°C or higher. By this production method, it is possible to obtain a high-strength hot-dip galvanized steel sheet having excellent corrosion resistance and resistance to peeling of coating during high-level work.

Description

technical field [0001] The present invention relates to a high-strength galvanized steel sheet having excellent workability using a high-strength steel sheet containing Si and Mn as a base material and a method for producing the same. Background technique [0002] In recent years, hot-dip galvanized steel sheets and alloyed hot-dip galvanized steel sheets among surface-treated steel sheets for imparting rust resistance to base steel sheets have been widely used in the fields of automobiles, home appliances, and building materials. In addition, from the viewpoint of improving the fuel efficiency of automobiles and improving the crash safety of automobiles, it is strongly desired to reduce the thickness of the body material by increasing the strength of the body material, thereby reducing the weight and increasing the strength of the body itself. Therefore, the application of high-strength steel sheets to automobiles has been promoted. [0003] Generally, a hot-dip galvanized...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/02C21D1/74C21D9/46C22C18/00C22C38/00C22C38/06C22C38/58C23C2/06C23C2/28
CPCC23C2/40C23C2/12C23C2/28C22C38/06C22C38/04C23C2/02C21D9/46C21D9/561C21D2211/005C21D1/26C21D9/48C22C38/02C23C2/0038C23C2/024C23C2/022C21D1/74C22C18/00C23C2/06
Inventor 伏胁祐介杉本芳春吉田昌浩铃木善继
Owner JFE STEEL CORP