CN-122003517-A - Hot dip plated steel material

Abstract

The plating layer comprises a Ni-containing metal layer and a Zn-Al-Mg alloy layer, and in the element distribution curve obtained by quantitative analysis of the steel material by GDS from the surface of the plating layer, when the depth of the point at which the Fe concentration reaches 1% is D dif1% and the depth of the point at which the Fe concentration reaches 95% is D dif95% , the maximum value C Nimax of the Ni concentration in D dif1% ~D dif95% and the maximum value C αmax of the concentration of the metal component α satisfy formulas (1) to (3), and when the depth of the point reaching C Nimax is D Nimax and the depth of the point reaching C αmax is D αmax , the following formula (4), C αmax <C Nimax ..formula (1), 0.05+.c αmax /（C Nimax +C αmax ) < 0.50..formula (2), 0.2% < C αmax ..formula (3), and |d αmax -D Nimax |+.0.1 μm..formula (4) are satisfied.

Inventors

• HIROYUKI KAWAMOTO
• SUMIDA KOHEI

Assignees

• 日本制铁株式会社

Dates

Publication Date

20260508

Application Date

20241011

Priority Date

20231013

Claims (3)

1. 1. A hot dip plated steel material comprising a steel material and a plating layer disposed on the surface of the steel material, wherein the plating layer comprises a Ni-containing metal layer disposed on the steel material and a Zn-Al-Mg alloy layer disposed on the Ni-containing metal layer, The plating layer comprises, in mass percent Al is more than 10.0% and less than 40.0%, 3.0 To 15.0 percent of Mg, Ni is 0.03-5.0%, Si is 0% to 2.0%, 0% To 0.7% Sn, Bi is 0% to 0.3%, In is 0% to 0.3%, Ca is 0% to 0.6%, Y is 0% or more and 0.3% or less, La is 0% to 0.3%, 0% To 0.3% of Ce, 0% To 0.3% of Sr, Li is 0% to 0.3%, Fe is 0% to 5.0%, Cr is 0% to 3.00%, Mo is 0% to 3.00%, W is 0% or more and 3.00% or less, Mn is 0% to 3.00%, Co is 0% to 3.00%, Zr of 0% to 0.25%, Cu is 0% to 0.25%, Ag is 0% to 0.25%, 0% To 0.25% Ti, Nb is 0% to 0.25%, 0% To 0.25% of Sb, Pb is 0% to 0.25%, B is 0% to 1.5%, P is 0% to 1.5%, V is 0% or more and 0.25% or less, The chemical composition of the rest Zn and impurities, In the chemical composition, the total content of 1 or more elements selected from the group of elements consisting of Cr, mo, W, mn and Co is 0.03% or more, In the element distribution curve obtained by quantitatively analyzing the steel material from the surface of the plating layer by glow discharge luminescence analysis, when the depth of the point at which the Fe concentration reaches 1% is D dif1% and the depth of the point at which the Fe concentration reaches 95% is D dif95% , The maximum value C Nimax of the Ni concentration in D dif1% ~D dif95% and the maximum value C αmax of the concentration of the metal component alpha satisfy the following formulas (1) to (3), When the depth of the point reaching C Nimax is D Nimax and the depth of the point reaching C αmax is D αmax , the following expression (4) is satisfied, The metal component alpha is more than 1 selected from the element group, C αmax <C Nimax ..A.6 (1) C αmax /（C Nimax +C αmax ) 0.05 < 0.50..formula (2) 0.2% < C αmax ..formula (3) D αmax -D Nimax is less than or equal to 0.1 μm.
2. 2. A hot-dip plated steel material according to claim 1, wherein the following formulas (5) and (6) are satisfied, 3.5% < C αmax ..formula (5) C αmax /（C Nimax +C αmax is more than or equal to 0.2). Formula (6).
3. 3. Hot dip plated steel material according to claim 1 or 2, characterized in that, In the element distribution curve, when the depth of the point at which the Fe concentration reaches 50% is set to D dif50% , the following formulas (7) and (8) are satisfied, 7.50.Ltoreq.D dif95% ）-（D dif50% . Formula (7) (D dif50% ）-（D dif1% ) is less than or equal to 10.00.

Description

Hot dip plated steel material Technical Field The present disclosure relates to a hot dip plated steel material. The present application is based on claims priority at 2023, 10/13 and japanese patent application No. 2023-177270 to japanese application, the contents of which are incorporated herein by reference. Background In the case of long-term use of steel, it is preferable to apply some rust inhibitive treatment that resists corrosion to the steel. The hot dip Zn plating method is used as a means for inexpensive rust-preventive steel in various fields requiring rust prevention of steel, such as civil engineering, construction, and automotive fields. For example, patent documents 1 and 2 disclose zn—al—mg-based plated steel sheets that have been attracting attention as high corrosion-resistant plated steel sheets in recent years. The pursuit of high corrosion resistance of the plating layer can achieve a long Life of the steel material and also can achieve reduction of LCC (Life-Cycle Cost) due to maintenance free, and thus, research is actively being conducted. A high corrosion resistance plated steel sheet including a Zn-Al-Mg series plated steel sheet is mostly a hot dip plated steel sheet manufactured by a continuous hot dip galvanizing apparatus. The problem of these hot dip plated steel sheets for achieving high corrosion resistance is corrosion resistance of exposed portions of base steel (exposed portions of base steel) exposed due to external factors such as cutting, bending, drawing, and the like. At the exposed portion of the base steel, the base steel having poor corrosion resistance is corroded under the sacrificial corrosion prevention effect of the plating layer around. However, the sacrificial corrosion protection of the coating promotes corrosion of the coating itself. Here, cr, which is generally passivated in an atmospheric environment, is effective in order to improve corrosion resistance of steel. That is, it is considered that by adding Cr, ni, or the like as the base steel of the plated steel material, high alloy steel or corrosion-resistant steel having properties close to those of stainless steel is used, and corrosion resistance of the exposed portion of the base is improved, and thus, it is possible to suppress the occurrence of red rust or the sacrifice of corrosion resistance due to Fe elution. Therefore, in order to further achieve high corrosion resistance of the plated steel material, it is considered that stainless steel is preferably used as the base steel. But it is difficult to form a plating layer on stainless steel or is not a practical technique from the viewpoint of price. Prior art literature Patent literature Patent document 1 International publication No. 2019/230894 Patent document 2 International publication No. 2018/139629 Patent document 3 Japanese patent laid-open No. 2021-042452 Disclosure of Invention Problems to be solved by the invention The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a hot dip plated steel material having improved corrosion resistance at exposed portions (hereinafter also referred to as exposed portions) on the surface of the steel material and improved corrosion resistance over a long period of time. Means for solving the problems In order to solve the above problems, the present disclosure adopts the following configuration. [1] The plated steel material according to one embodiment of the present disclosure is a hot dip plated steel material having a steel material and a plating layer disposed on the surface of the steel material, The plating layer comprises a Ni-containing metal layer provided on the steel material and a Zn-Al-Mg alloy layer provided on the Ni-containing metal layer, The plating layer comprises, in mass% Al is more than 10.0% and less than 40.0%, 3.0 To 15.0 percent of Mg, Ni is 0.03-5.0%, Si is 0% to 2.0%, 0% To 0.7% Sn, Bi is 0% to 0.3%, In is 0% to 0.3%, Ca is 0% to 0.6%, Y is 0% or more and 0.3% or less, La is 0% to 0.3%, 0% To 0.3% of Ce, 0% To 0.3% of Sr, Li is 0% to 0.3%, Fe is 0% to 5.0%, Cr is 0% to 3.00%, Mo is 0% to 3.00%, W is 0% or more and 3.00% or less, Mn is 0% to 3.00%, Co is 0% to 3.00%, Zr of 0% to 0.25%, Cu is 0% to 0.25%, Ag is 0% to 0.25%, 0% To 0.25% Ti, Nb is 0% to 0.25%, 0% To 0.25% of Sb, Pb is 0% to 0.25%, B is 0% to 1.5%, P is 0% to 1.5%, V is 0% or more and 0.25% or less, The chemical composition of the rest Zn and impurities, In the chemical composition, the total content of 1 or more elements selected from the group consisting of Cr, mo, W, mn and Co is 0.03% or more, In the element distribution curve obtained by quantitatively analyzing the steel material from the surface of the plating layer by glow discharge luminescence analysis, when the depth of the point at which the Fe concentration reaches 1% is D dif1% and the depth of the point at which the Fe concentration reaches 95% is D dif95%, The maximum value C Nimax of the