Plated steel material

Patent metadata

Field	Value
Publication number	US-2025333821-A1
Application number	US-202418648041-A
Country	US
Kind code	A1
Filing date	Apr 26, 2024
Priority date	Apr 26, 2024
Publication date	Oct 30, 2025
Grant date	—

Abstract

A plated steel material including a plated layer and a base steel material. In a cross section perpendicular to a surface of the plated steel material, a length L of a boundary line between the plated layer and the base steel material satisfies (L−L0)/L0×100≥2.0 (%), wherein L0 is a linear distance between ends of the boundary line in an observation region, and L is a length of the boundary line between the ends. The plated layer includes a first region where an Fe concentration is less than 5.0 mass %, a second region where an Fe concentration is 5.0 mass % or more and less than 30.0 mass %, and a third region where an Fe concentration is 30.0 mass % or more and 80.0 mass % or less, the first region including an Al-containing phase at an area fraction of 5% or more.

First claim

1 . A plated steel material comprising: a base steel material; and a plated layer arranged on a surface of the base steel material, wherein
the plated layer includes, as a chemical composition, in terms of mass %,
5.0 to 40.0% of Al,
0.5 to 15.0% of Mg,
5.0 to 40.0% of Fe,
0 to 2.0% of Si,
0 to 2.0% of Ca,
one or more selected from following group A and group B, and
a balance including Zn and impurities,
in a cross section perpendicular to a surface of the plated steel material, when observing an observation region which is a cross section of the plated steel material having a predetermined length in a direction parallel to the surface of the plated steel material, a length L of a boundary line between the plated layer and the base steel material satisfies following formula (1), the plated layer includes a first region which is arranged at the surface of the plated steel material and where an Fe concentration is less than 5.0 mass %, a second region which is adjacent to the first region and where an Fe concentration is 5.0 mass % or more and less than 30.0 mass %, and a third region which is arranged between the second region and the base steel material and where an Fe concentration is 30.0 mass % or more and 80.0 mass % or less, a thickness of the first region is 5 to 100 μm, a thickness of the second region is 5 to 100 μm, a thickness of the third region is 5 to 100 μm, and the first region includes an Al-containing phase at an area fraction of 5% or more, the Al-containing phase including Zn and 20 to 99 mass % of Al; herein, [Group A] 0 to 1.0% of Ni, [Group B] 0 to 5% in total of one or more of 0 to 0.5% of Sb, 0 to 0.5% of Pb, 0 to 1.0% of Cu, 0 to 2.0% of Sn, 0 to 1.0% of Ti, 0 to 1.0% of Cr, 0 to 1.0% of Nb, 0 to 1.0% of Zr, 0 to 1.0% of Mn, 0 to 1.0% of Mo, 0 to 1.0% of Ag, 0 to 1.0% of Li, 0 to 0.5% of La, 0 to 0.5% of Ce, 0 to 0.5% of B, 0 to 0.5% of Y, 0 to 0.5% of P, 0 to 0.5% of Sr, 0 to 0.5% of Co, 0 to 0.5% of Bi, 0 to 0.5% of In, 0 to 0.5% of V, and 0 to 0.5% of W;

(

L
-

L
0

)

/

L
0

×

100

≥

2.

(
%
)

,

(
1
)

herein, in the formula (1), L 0 is a linear distance between one end and another end of the boundary line in the observation region, and L is a length of the boundary line between the one end and the other end.

2 . The plated steel material according to claim 1 , wherein a following formula (2) is satisfied,

(

L
-

L
0

)

/

L
0

×

100

≥

4.

(
%
)

,

(
2
)

herein, in the formula (2), L 0 is a linear distance between one end and another end of the boundary line in the observation region, and L is a length of the boundary line between the one end and the other end.

3 . The plated steel material according to claim 1 , wherein a following formula (3) is satisfied,

(

L
-

L
0

)

/

L
0

×

100

≥

6.

(
%
)

,

(
3
)

herein, in the formula (3), L 0 is a linear distance between one end and another end of the boundary line in the observation region, and L is a length of the boundary line between the one end and the other end.

4 . The plated steel material according to claim 1 , wherein the thickness of the first region is 15 to 100 μm.

5 . The plated steel material according to claim 1 , wherein the area fraction of the Al-containing phase in the first region is 15% or more.

6 . The plated steel material according to claim 1 , wherein the first region includes a Mg—Zn phase including Zn and 20 to 60 mass % of Mg, and an area fraction of the Mg—Zn phase in the first region is 15% or more.

7 . The plated steel material according to claim 1 , wherein the first region includes a binary eutectic structure of an Al phase and a Mg—Zn phase, and an area fraction of the binary eutectic structure in the first region is 5% or more.

8 . The plated steel material according to claim 1 , wherein the thickness of the second region is 15 to 100 μ

Assignees

• Nippon Steel Corp

Inventors

• Mitsunobu Takuya
• Ishii Kotaro
• Saito Mamoru
• Takebayashi Hiroshi

Classifications

• C23C28/322

  only coatings of metal elements only · CPC title

• C23C30/005

  on hard metal substrates · CPC title

• C22C18/00

  Alloys based on zinc · CPC title

• B32B15/012

  one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy · CPC title

• B32B15/01

  all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)} · CPC title