Hot-dip al-plated steel sheet production method, and hot-dip al-plated steel sheet

Inactive Publication Date: 2021-01-07
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0028]An aspect of the present invention makes it possible to bring about an effect of providing a method for producing a h

Problems solved by technology

This causes each spangl

Method used

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  • Hot-dip al-plated steel sheet production method, and hot-dip al-plated steel sheet
  • Hot-dip al-plated steel sheet production method, and hot-dip al-plated steel sheet
  • Hot-dip al-plated steel sheet production method, and hot-dip al-plated steel sheet

Examples

Experimental program
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Effect test

Example

[0088](Composition Adjusting Step)

[0089]Before the substrate steel sheet is dipped in the Al-based hot-dip plating bath so as to pass through the Al-based hot-dip plating bath, the composition adjusting step of adjusting a composition of the Al-based hot-dip plating bath by adjusting respective concentrations of elements contained in the Al-based hot-dip plating bath.

[0090]In a case where a B concentration in the Al-based hot-dip plating bath is adjusted by adding a B-containing master alloy, the Al-based hot-dip plating bath can have a B concentration of not less than 0.005 mass % (a boron concentration adjusting step). Examples of the B-containing master alloy include an Al—B alloy, an alloy of titanium and B (Ti—B alloy), and an alloy of nickel and B (Ni—B alloy). In a case where KBF4 is used in a process for producing the B-containing master alloy, flux containing K is mixed in the B-containing master alloy.

[0091]Thus, in a case where the B concentration in the Al-based hot-dip ...

Example

Example 1

[0120]An Al-20 mass % Si master alloy was used to adjust an Si concentration in an aluminum plating bath to 9 mass %. Then, an Al-4 mass % B master alloy was added, in a predetermined amount, to the aluminum plating bath so that a B concentration in the aluminum plating bath was adjusted to 0% to 1%. Table 1 shows a result obtained by carrying out a chemical analysis with respect to a composition of the Al-4 mass % B master alloy added. Each figure shown in Table 1 indicates mass %.

TABLE 1Chemical composition (mass %)BSiFeK4.20.130.160.20

[0121]Assuming that Fe coming from, for example, a substrate steel sheet and a member of a pot would be unavoidably mixed in the aluminum plating bath during continuous production, cast iron that was made of a material of which the pot was made was melted so that an Fe concentration in the aluminum plating bath was adjusted to 2.0 mass %.

[0122]By thus adjusting the composition, Al-based hot-dip plating baths indicated by plating bath Nos. 1...

Example

[0165]As shown in Example Nos. 1 to 18 of the present invention, in Example in which a B concentration in the Al-based hot-dip plating bath falls within the scope of the present invention, not less than 100 spangle crystal nuclei were present per square centimeter surface area of an aluminum plated layer of a hot-dip Al-based metal-plated steel sheet produced, and a good effect of providing finer spangles was exhibited.

[0166]Furthermore, in each of Example Nos. 1 to 18 of the present invention, a K concentration of less than 0.0005% was obtained due to the flux removal treatment, and no black foreign substance was wound onto the drive roll 22. This shows that it is possible in long time continuous production to (i) reduce production of a black foreign substance and (ii) prevent adhesion of a foreign substance to a sink roll.

[0167]That is, a hot-dip Al-based metal-plated steel sheet including a plated layer having a surface on which fine spangles are stably formed can be continuously...

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Abstract

Provided is a method for producing a hot-dip Al-based metal-plated steel sheet including a plated layer having a surface on which fine spangle are stably formed. A method for producing a hot-dip Al-based metal-plated steel sheet, includes a composition adjusting step of adding a B-containing master alloy so as to adjust a composition of an Al-based hot-dip plating bath (3) containing aluminum as a main component, the composition being adjusted so that the Al-based hot-dip plating bath has a B concentration of not less than 0.005 mass % and a K concentration of more than 0 mass % and less than 0.0005 mass %, the K concentration being reduced in the Al-based hot-dip plating bath by supplying gas into the Al-based hot-dip plating bath so as to remove a suspended matter on a surface of the Al-based hot-dip plating bath.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for producing a hot-dip Al-based metal-plated steel sheet that has fine spangles.BACKGROUND ART[0002]A hot-dip aluminum-based metal-plated steel sheet (hereinafter referred to as a “hot-dip Al-based metal-plated steel sheet”) is a steel sheet whose surface is plated with metal, containing aluminum as a main component, by a hot-dip method so that the steel sheet can have higher corrosion resistance and higher heat resistance. Such a hot-dip Al-based metal-plated steel sheet has been widely used mainly for members that are required to have heat resistance, such as exhaust gas members of automobiles and members of combustion devices.[0003]Note that a hot-dip Al-based metal-plated steel sheet includes a plated layer having a surface on which a spangle pattern appears, the spangle pattern being formed due to dendrites, which are structures obtained by solidification of aluminum. The spangle pattern is a characteristic geometr...

Claims

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Application Information

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IPC IPC(8): C23C2/12C23C2/40
CPCC23C2/12C23C2/40C22C21/04C22C1/03C22C3/005C23C2/00344C23C2/004C23C2/325C22C21/02
Inventor FURUKAWA, SHINYAISHII, KOUTAROUHATTORI, YASUNORI
Owner NIPPON STEEL CORP
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