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Plated steel

A steel and coating technology, applied in the direction of electrophoretic coating, superimposed layer coating, hot-dip coating process, etc., can solve the problems of corrosion resistance degradation, joint strength reduction, etc., to improve corrosion resistance and inhibit the formation of pores Effect

Active Publication Date: 2019-09-13
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When manufacturing welded structures by welding galvanized steel materials or zinc-based alloy-coated steel materials, there is a unique problem of embrittlement by liquid metal caused by hot dipping in the heat-affected zone of the weld metal and base metal. Cracking (hereinafter also referred to as "LME"), reduction in joint strength due to the formation of pores caused by Zn evaporation, and around the land and the back side of the land caused by Zn evaporation (hereinafter also referred to as around the land and on the back side of the land) Deterioration of corrosion resistance known as "welding heat-affected zone")

Method used

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Experimental program
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Effect test

Embodiment A

[0355] In order to obtain coatings with the chemical compositions shown in Tables 1-1 to 1-3, a coating bath was established in a vacuum melting furnace in the atmosphere using a predetermined amount of pure metal ingots. In the production of plated steel sheets, a batch type hot-dipping apparatus is used.

[0356] As comparative materials, Nos. 102 and 103 prepared commercially available Zn-Al-Mg-based plated steel sheets and hot-dip Zn-plated steel sheets. The thicknesses of the plating layers were all 20 μm.

[0357] As the coating bottom plate, use 3.2mm common material hot-rolled carbon steel 100×200mm (C=0.15%, Si=0.005%, Mn=0.55%, P=0.015%, S=0.005%), and the coating process will be performed soon Before, degreasing and pickling are carried out.

[0358] In the production of any sample, the same reduction treatment method is implemented for the plated bottom plate until the process of pulling it up after dipping in the plating bath. That is, at N 2 -H 2 (5%) (dew p...

Embodiment B

[0417] In order to obtain the coating with the chemical composition shown in Table 2-1, use a specified amount of pure metal ingot to establish a coating bath in the atmosphere in a vacuum melting furnace. In the production of plated steel sheets, a batch type hot-dipping apparatus is used.

[0418] As the coating bottom plate, use 3.2mm common material hot-rolled carbon steel 100×200mm (C=0.15%, Si=0.005%, Mn=0.55%, P=0.015, S=0.005%), just before the coating process , implement degreasing and pickling.

[0419] In the production of any sample, the same reduction treatment method is implemented for the plated bottom plate until the process of pulling it up after dipping in the plating bath. That is, at N 2 -H 2 (5%) (dew point - 40 ° below, oxygen concentration below 25ppm) environment, use electric heating to heat the plated steel plate from room temperature to 800 ° C, after 60 seconds, spray N 2 Cool to the bath temperature +10°C, then immediately immerse in the bath. ...

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Abstract

Provided is a plated steel which curbs LME and the formation of blowholes, and which improves the corrosion resistance of welding heat-affected zones. This plated steel is hot-dipped plated steel comprising steel and a plating layer which includes a Zn-Al-Mg alloy layer which is positioned on the surface of the steel. In a cross section of the Zn-Al-Mg alloy layer, the surface area percentage of MgZn2 phase is 45-75%, the total surface area percentage of MgZn2 phase and Al phase is at least 70%, and the surface area percentage of the Zn-Al-MgZn2 ternary eutectic structure is 0-5%. The platinglayer has a predetermined chemical composition.

Description

technical field [0001] The invention relates to a plated steel material. Background technique [0002] Galvanized steel is used in a wide range of fields such as construction and automobiles from the viewpoint of improving the corrosion resistance of structural parts. In the past, to improve the corrosion resistance of civil structures, the method that can be used is to weld non-plated steel materials, and then immerse them in a zinc bath to attach a coating to the surface of the steel materials and the welded area, so as to ensure the overall corrosion resistance of the structure. [0003] However, this method is inferior in productivity because plating is performed after soldering, and equipment such as a plating bath is required, which may lead to an increase in manufacturing cost. [0004] In order to avoid such a situation, a method of manufacturing a structure by welding pre-coated galvanized steel materials (for example, galvanized steel sheets) has been applied. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C22C18/04C23C2/40C22C38/00C22C38/04
CPCC22C18/04C22C38/00C22C38/04C23C2/06C23C2/40C23C2/02C23C2/26C23C28/021C23C28/023C23C28/025C23C22/12C25D13/22C25D11/38C23C2/024C23C2/261C23C2/20C23C2/12
Inventor 德田公平石田钦也光延卓哉下田信之
Owner NIPPON STEEL CORP
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