Hot-dip plated steel

Patent metadata

Field	Value
Publication number	US-11814732-B2
Application number	US-202118009015-A
Country	US
Kind code	B2
Filing date	Sep 7, 2021
Priority date	Sep 7, 2021
Publication date	Nov 14, 2023
Grant date	Nov 14, 2023

Abstract

A hot-dip plated steel includes a base steel and a hot-dip plating layer on a surface of the base steel, a chemical composition of the hot-dip plating layer contains, by mass %, Al: 10.00% to 30.00%, Mg: 3.00% to 12.00%, Sn: 0% to 2.00%, Si: 0% to 2.50%, Ca: 0% to 3.00%, Ni: 0% or more and less than 0.25%, Fe: 0% to 5.00%, and the like, a remainder includes Zn and impurities, a metallographic structure of the hot-dip plating layer contains 5 to 45 area % of an α phase having a grain diameter of 0.5 to 2 μm, the metallographic structure of the hot-dip plating layer contains 15 to 70 area % of a MgZn 2 phase, and, among the α phases having the grain diameter of 0.5 to 2 μm, an area ratio of an α phase having a (111)α//(0001)MgZn 2 orientation relationship to the adjacent MgZn 2 phase is 25% to 100%.

First claim

The invention claimed is:

1. A hot-dip plated steel comprising:
a base steel; and
a hot-dip plating layer disposed on a surface of the base steel,
wherein a chemical composition of the hot-dip plating layer is, by mass %,
Al: 10.00% to 30.00%,
Mg: 3.00% to 12.00%,
Sn: 0% to 2.00%,
Si: 0% to 2.50%,
Ca: 0% to 3.00%,
Ni: 0% or more and less than 0.25%,
Cr: 0% or more and less than 0.25%,
Ti: 0% or more and less than 0.25%,
Co: 0% or more and less than 0.25%,
V: 0% or more and less than 0.25%,
Nb: 0% or more and less than 0.25%,
Cu: 0% or more and less than 0.25%,
Mn: 0% or more and less than 0.25%,
Bi: 0% or more and less than 5.000%,
In: 0% or more and less than 2.00%,
Y: 0% to 0.50%,
La: 0% or more and less than 0.50%,
Ce: 0% or more and less than 0.50%,
Fe: 0% to 5.00%,
Sr: 0% or more and less than 0.50%,
Sb: 0% or more and less than 0.50%,
Pb: 0% or more and less than 0.50%, and
B: 0% or more and less than 0.50%,
a remainder includes Zn and impurities,
a metallographic structure of the hot-dip plating layer contains 5 to 45 area % of an α phase having a grain diameter of 0.5 to 2 μm,
the metallographic structure of the hot-dip plating layer contains 15 to 70 area % of a MgZn 2 phase, and
among the α phase having the grain diameter of 0.5 to 2 μm, an area ratio of the α phase having a (111) α //(0001) MgZn2 orientation relationship to the adjacent MgZn 2 phase is 25% to 100%.

2. The hot-dip plated steel according to claim 1 ,
wherein, among the α phase having the grain diameter of 0.5 to 2 μm, the area ratio of the α phase having the (111) α //(0001) MgZn2 orientation relationship to the adjacent MgZn 2 phase is 60% to 100%.

3. The hot-dip plated steel according to claim 2 ,
wherein the chemical composition of the hot-dip plating layer is, by mass %,
Mg: 5.00% to 8.00%, and
Sn: 0.05% to 2.00%.

4. The hot-dip plated steel according to claim 1 ,
wherein the chemical composition of the hot-dip plating layer is, by mass %,
Mg: 5.00% to 8.00%, and
Sn: 0.05% to 2.00%.

Assignees

• Nippon Steel Corp

Inventors

• Mitsunobu Takuya
• Saito Mamoru
• Tokuda Kohei
• Takebayashi Hiroshi

Classifications

• C23C2/50

  Controlling or regulating the coating processes (C23C2/14 takes precedence) · CPC title

• C23C2/29

  Cooling or quenching · CPC title

• C22C18/04

  with aluminium as the next major constituent · CPC title

• C23C2/06 Primary

  Zinc or cadmium or alloys based thereon · CPC title

• B32B15/013

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