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Hot-dipped al-zn series steel plate and manufacturing method thereof

A manufacturing method and hot-dip plating technology, applied in hot-dip plating process, chemical instruments and methods, transportation and packaging, etc., to achieve the effects of excellent corrosion resistance, lightweight corrosion resistance, and extended life

Active Publication Date: 2018-09-18
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, there is a problem that all hot-dipped Al-Zn-based steel sheets cannot be used in an uncoated state.

Method used

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  • Hot-dipped al-zn series steel plate and manufacturing method thereof
  • Hot-dipped al-zn series steel plate and manufacturing method thereof
  • Hot-dipped al-zn series steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] (Example 1: Samples 1 to 31)

[0067] For all the hot-dipped Al-Zn-based steel sheets as samples, a cold-rolled steel sheet with a plate thickness of 0.8 mm manufactured by a conventional method was used as a base steel sheet, and the bath temperature of the molten bath was 600 ° C. Coating weight is 50g / m on each side 2 (i.e. 100g / m on both sides 2 ) under the conditions of manufacture.

[0068] In addition, the hot-dipped Al-Zn-based steel sheets of Samples 21 to 28 were subjected to a temperature maintenance treatment described in Example 2 described later.

[0069] (1) Composition of coating

[0070] Hot-dipped Al-Zn-plated steel sheets as samples were each punched into Φ100 mm, immersed in 35% hydrochloric acid aqueous solution to dissolve the coating, and then confirmed by quantifying the composition of the solution by ICP emission spectroscopic analysis. Table 1 shows the composition of each sample.

[0071] (2) Evaluation of corrosion resistance after coati...

Embodiment 2

[0092] Among the samples of the present invention produced in Example 1, the hot-dipped Al-Zn-based steel sheets of the samples 21 to 28 of the present invention were subjected to the above-mentioned hot-dip coating treatment, cooled to 370°C, and listed in Table 2. The temperature maintenance treatment was carried out under the conditions shown.

[0093] Then, the following evaluation was performed about samples 3-5, 10-12, 17, 18, and 21-31.

[0094] (1) Vickers hardness of the coating

[0095] For each sample of the above-mentioned hot-dip-plated Al-Zn-based steel sheet, after grinding the cross-section of the coating, use a micro-Vickers hardness tester to measure the Vickers hardness of any part of the upper layer side of the coating from the cross-sectional direction with a load of 5 gf, and measure 20 for each. points. The average value of the measured 20 points was calculated as the hardness of the plating layer. The calculation results are shown in Table 2.

[009...

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Abstract

An object of the present invention is to provide a hot-dipped Al-Zn-based steel sheet having excellent post-paint corrosion resistance and a method for producing the same. In order to achieve the above object, the present invention is characterized in that it has the following coating layer. In the coating layer, Al: 25% to 90% is contained in the mass %, and Sn: 0.01% to 2.0% and In: 0.01% to 10% are also included. , and Bi: one or more selected from the group consisting of 0.01 to 2.0%.

Description

technical field [0001] The present invention relates to a hot-dip Al-Zn alloyed steel sheet excellent in corrosion resistance after coating (hot-dip Al-Zn alloyed steel sheet) and a manufacturing method thereof. Background technique [0002] A hot-dip Al-Zn-based steel sheet, for example, a hot-dip Al-Zn-based steel sheet containing 25 to 90% by mass of Al in a zinc-based coating layer exhibits excellent corrosion resistance compared to a hot-dip galvanized steel sheet sex. [0003] Generally, the hot-dipped Al-Zn-based steel sheet can be produced by using a thin steel sheet obtained by hot-rolling or cold-rolling a steel slab as a base steel sheet, and using the base steel sheet in an annealing furnace of a continuous hot-dip coating production line. Manufactured by performing recrystallization annealing and hot-dipping treatment. The formed Al—Zn-based plating layer has an alloy layer present at the interface with the base steel sheet and an upper layer present on the al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/12C22C18/04C22C21/10C23C2/06C23C2/28C23C2/40
CPCC22C18/04C22C21/10Y10T428/12979Y10T428/12972Y10T428/12993C23C2/12Y10T428/12757Y10T428/12799B32B15/012B32B15/013C22C21/00C23C2/28C23C2/40C23C2/26C23C2/00C23C2/04C23C2/405C23C30/00C23C30/005C23C2/06
Inventor 吉田昌浩松崎晃安藤聪
Owner JFE STEEL CORP