Hot-dip plated steel sheet

Patent metadata

Field	Value
Publication number	US-12410501-B2
Application number	US-202318848434-A
Country	US
Kind code	B2
Filing date	Jun 9, 2023
Priority date	Jun 10, 2022
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

A hot-dip plated steel sheet includes a hot-dip plated layer formed on a surface of a steel sheet, the hot-dip plated layer contains 4 to 22 mass % of Al and 1.0 to 10 mass % of Mg with a remainder including Zn and impurities. A pattern portion and a non-pattern portion are formed in the hot-dip plated layer. An element concentrated region containing an element M and an interface alloy layer containing Fe and Al are present at an interface between the steel sheet and the hot-dip plated layer in the pattern portion. An average concentration of the element M contained in the hot-dip plated layer present in the pattern portion and the element concentrated region is 0.0010 to 2 mass %. In the element concentrated region, the element M is concentrated two or more times the hot-dip plated layer present in the pattern portion, or the element M is unevenly distributed.

First claim

The invention claimed is:

1. A hot-dip plated steel sheet, comprising:
a steel sheet having first and second surfaces on respective opposite sides of the steel sheet, and a hot-dip plated layer formed on at least the first surface of the steel sheet, wherein
the hot-dip plated layer, in terms of average composition, contains 4 to 22 mass % of Al and 1.0 to 10 mass % of Mg with a remainder including Zn and impurities,
the hot-dip plated layer includes a pattern portion and a non-pattern portion,
an element concentrated region containing one or more elements M of Sb, Pb, Sn, Ca, Co, Mn, P, B, Bi, Cr, Sc, Y, Ni, Ti, Zr, Mo, W, REM, Hf, and C, and an interface alloy layer containing Fe and Al are present at an interface between the steel sheet and the hot-dip plated layer in the pattern portion,
an average concentration of each of the one or more elements M contained in the hot-dip plated layer present in the pattern portion and each of the one or more elements M contained in the element concentrated region is individually 0.0010 to 2 mass %, and
wherein either:
each of the one or more elements M contained in the element concentrated region has a concentration, on a mass basis, of two or more times the respective concentration of each of the one or more elements M that is present, on a mass basis, in the hot-dip plated layer present in the pattern portion, or
each of the one or more elements M is unevenly distributed such that each of the one or more elements M is present in the element concentrated region and each of the one or more elements M is not detected from the pattern portion other than the element concentrated region.

2. The hot-dip plated steel sheet according to claim 1 , wherein the interface alloy layer containing Fe and Al is present at an interface between the steel sheet of the non-pattern portion and the hot-dip plated layer.

3. The hot-dip plated steel sheet according to claim 1 , wherein the concentration of each of the one or more elements M at the interface between the steel sheet of the pattern portion and the hot-dip plated layer is, on a mass basis, 1.5 times or more the concentration of each of the one or more elements M at an interface between the steel sheet of the non-pattern portion and the hot-dip plated layer.

4. The hot-dip plated steel sheet according to claim 1 , wherein the pattern portion is disposed to have a predetermined shape selected from the group consisting of a straight line portion, wherein the straight line portion has a length of 1 mm or more, a curve portion, wherein the curve portion has a length of 1 mm or more, a dot portion, wherein the dot portion has a circle equivalent diameter of 1 mm or more and less than 10 mm, or a combination of two or more thereof.

5. The hot-dip plated steel sheet according to claim 1 , wherein the hot-dip plated layer further, in terms of average composition, contains 0.0001 to 2 mass % of Si.

6. The hot-dip plated steel sheet according to claim 5 , wherein the interface alloy layer formed in the pattern portion further contains Si.

7. The hot-dip plated steel sheet according to claim 5 , wherein the interface alloy layer containing Fe and Al is present at an interface between the steel sheet of the non-pattern portion and the hot-dip plated layer, and wherein the interface alloy layer formed at the interface between the steel sheet of the non-pattern portion and the hot-dip plated layer further contains Si.

8. The hot-dip plated steel sheet according to claim 1 , wherein the hot-dip plated layer excluding the element concentrated region, in terms of average composition, further contains 0.0001 to 1 mass % in total of any one or more of Ni, Ti, Zr, Sr, Fe, Sb, Pb, Sn, Ca, Co, Mn, P, B, Bi, Cr, Sc, Y, REM, Hf, and C.

9. The hot-dip plated steel sheet according to claim 1 , wherein the hot-dip plated layer is formed on both the first and the second surfaces, and wherein an adhesion amount is provided such that the total adhesion amount on both the first and the second surfaces is within the range of 30 to 600 g/m 2 .

Assignees

• Nippon Steel Corp

Inventors

• Toba Tetsuya
• Kawamura Yasuaki
• Nakagawa Jun
• UEMURA Shintaro
• Tanaka Tomohito

Classifications

• C23C2/16

  using fluids under pressure, e.g. air knives · CPC title

• C23C2/26

  After-treatment (C23C2/14 takes precedence) · CPC title

• C23C2/02

  Pretreatment of the material to be coated, e.g. for coating on selected surface areas (C23C2/30 takes precedence) · CPC title

• C23C2/12

  Aluminium or alloys based thereon · CPC title

• C23C30/005

  on hard metal substrates · CPC title