Continuous hot-dip galvanizing apparatus and method for manufacturing hot-dip galvanized steel sheet

A technology of hot-dip galvanized steel sheet and manufacturing method, which is applied in the direction of hot-dip galvanizing process, manufacturing tools, heat treatment furnace, etc., can solve problems such as hindering productivity, delayed alloying, poor coating adhesion, etc., and achieves suppression of roll marks, The effect of good plating appearance

Active Publication Date: 2020-01-14
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, even when non-plating does not occur, there is a problem that plating adhesion is poor
In addition, there is a problem that if Si in the steel is selectively oxidized and concentrated on the surface of the steel sheet, the alloying process after hot-dip galvanizing produces a significant delay in alloying, which significantly hinders productivity

Method used

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  • Continuous hot-dip galvanizing apparatus and method for manufacturing hot-dip galvanized steel sheet
  • Continuous hot-dip galvanizing apparatus and method for manufacturing hot-dip galvanized steel sheet
  • Continuous hot-dip galvanizing apparatus and method for manufacturing hot-dip galvanized steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0078] (experimental conditions)

[0079] use Figure 1 ~ Figure 3 The shown continuous hot-dip galvanizing apparatus annealed the steel strips with the composition shown in Table 1 under various annealing conditions shown in Table 2, and then performed hot-dip galvanizing and alloying treatments. Steel type A is ordinary steel, and steel type B is high-tensile steel. Both the comparative example and the inventive example are continuously annealed, hot-dip galvanized and alloyed according to the order of passing through the plates recorded in Table 2.

[0080] The second heating zone is DFF. The heating burners are divided into 4 groups (#1~#4), and the 3 groups (#1~#3) on the upstream side of the steel plate moving direction are used as oxidation burners, and the final zone (#4) is used as reduction burners. The air ratios of the burner for oxidation and the burner for reduction were set to the values ​​shown in Table 2. In addition, the length of the steel plate conveyanc...

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Abstract

The present invention provides a continuous hot-dip galvanizing apparatus capable of suppressing the occurrence of roll marks in the soaking zone due to dew condensation in piping for humidified gas, etc., and obtaining a good plating appearance. The continuous hot-dip galvanizing device of the present invention includes: an annealing furnace provided with a heating zone, a soaking zone, and a cooling zone in sequence; and a hot-dip galvanizing equipment adjacent to the cooling zone. The gas supplied to the soaking zone (12) is mixed gas obtained by mixing gas humidified by the humidifier (50) and gas not humidified by the humidifier, and dry gas not humidified by the humidifier. The continuous hot-dip galvanizing device of the present invention has a drain device (80) for draining circulating water from the humidifier (50) when the mixed gas is not supplied to the soaking zone (12).

Description

technical field [0001] The present invention relates to a continuous hot-dip galvanizing device with an annealing furnace provided in parallel with a heating zone, a soaking zone and a cooling zone in sequence, and a hot-dip galvanizing equipment adjacent to the above-mentioned cooling zone and the continuous hot-dip galvanizing device using the continuous hot-dip galvanizing device A method of manufacturing hot-dip galvanized steel sheets. Background technique [0002] In recent years, demand for high tensile steel plates (High Tensile Strength Steel Plates), which contribute to the weight reduction of structures, etc., has increased in the fields of automobiles, home appliances, and building materials. As a high-tensile steel material, for example, it is known that by including Si in the steel, a steel sheet with good hole expandability can be produced, and that by including Si and Al in the steel, retained austenite (γ) can be easily formed, and a steel sheet with good du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/02C21D1/76C21D9/46C21D9/56C23C2/28C23C2/40C22C18/04C22C38/00C22C38/14
CPCC21D1/76C23C2/28C23C2/40C21D9/56C22C18/04C22C38/00C22C38/14C21D9/561C23C2/0222C23C2/004C23C2/0224C21D9/46
Inventor 武田玄太郎三宅胜
Owner JFE STEEL CORP
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