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US-12624419-B2 - Plated steel sheet

US12624419B2US 12624419 B2US12624419 B2US 12624419B2US-12624419-B2

Abstract

The plated steel sheet comprises: a steel sheet; and a plated layer arranged on a surface of the steel sheet, wherein the plated layer comprises, as a chemical composition, Al: 10.0% to 25.0%, Mg: 3.0% to 10.0%, Fe: 0.01% to 2.00%, Si: more than 0.00% and 2.00% or less, and a remainder comprising Zn and impurities, and when the plated layer is subjected to grazing incidence X-ray diffraction measurement under conditions where Cu-Kα ray is used, an acceleration voltage as an X-ray output is 50 kV, and an X-ray incident angle against a surface of the plated layer is 1°, an X-ray diffraction intensity ratio between a (300) plane of a Mg 21 Zn 25 phase and a (002) plane of an η-Zn phase (I (Mg 21 Zn 25 )/I (η-Zn)) is more than 0.3.

Inventors

  • Takuya MITSUNOBU
  • Masaaki Uranaka
  • Kotaro Ishii
  • Kohei Tokuda

Assignees

  • NIPPON STEEL CORPORATION

Dates

Publication Date
20260512
Application Date
20230607
Priority Date
20220818

Claims (8)

  1. 1 . A plated steel sheet comprising: a steel sheet; and a plated layer arranged on a surface of the steel sheet, wherein the plated layer comprises, as a chemical composition, in terms of mass %, Al: 10.0% to 25.0%, Mg: 3.0% to 10.0%, Fe: 0.01% to 2.00%, Si: more than 0.00% and 2.00% or less, at least one selected from a group consisting of following group A, group B, and group C, and a remainder containing Zn and impurities, and when the plated layer is subjected to grazing incidence X-ray diffraction measurement under conditions where Cu-Kα ray is used, an acceleration voltage as an X-ray output is 50 kV, and an X-ray incident angle against a surface of the plated layer is 1°, an X-ray diffraction intensity ratio between a (300) plane of a Mg 21 Zn 25 phase and a (002) plane of an n-Zn phase (I (Mg 21 Zn 25 )/I (η-Zn)) is more than 0.3, wherein, [Group A] Ni: 0% to 1.000%, [Group B] Ca: 0% to 0.05%, and [Group C] 0% to 5.000% in total of at least one of Sb: 0% to 0.50%, Pb: 0% to 0.50%, Cu: 0% to 1.00%, Sn: 0% to 1.00%, Ti: 0% to 1.00%, Cr: 0% to 1.00%, Nb: 0% to 1.00%, Zr: 0% to 1.00%, Mn: 0% to 1.00%, Mo: 0% to 1.00%, Ag: 0% to 1.00%, Li: 0% to 1.00%, La: 0% to 0.50%, Ce: 0% to 0.50%, B: 0% to 0.50%, Y: 0% to 0.50%, P: 0% to 0.50%, Sr: 0% to 0.50%, Co: 0% to 0.500%, Bi: 0% to 0.500%, In: 0% to 0.500%, V: 0% to 0.500%, and W: 0% to 0.500%.
  2. 2 . The plated steel sheet according to claim 1 , wherein the plated layer comprises, as the chemical composition, in terms of mass %, Mg: 4.5% to 10.0%, and the X-ray diffraction intensity ratio (I (Mg 21 Zn 25 )/I (η-Zn)) is 1.0 or more.
  3. 3 . The plated steel sheet according to claim 1 , wherein the plated layer comprises, as the chemical composition, in terms of mass %, Mg: 4.5% er more to 10.0%, and the X-ray diffraction intensity ratio (I (Mg 21 Zn 25 )/I (η-Zn)) is 5.0 or more.
  4. 4 . The plated steel sheet according to claim 1 , wherein the plated layer comprises, as the chemical composition, in terms of mass %, Mg: 4.5% er more to 10.0%, and the X-ray diffraction intensity ratio (I (Mg 21 Zn 25 )/I (η-Zn)) is 10.0 or more.
  5. 5 . The plated steel sheet according to claim 1 , wherein the plated layer comprises, as the chemical composition, in terms of mass %, Sn: 0.05% to 0.5%, and when the plated layer is subjected to X-ray diffraction measurement through θ-20 method, a Mg 2 Sn phase is detected in the plated layer.
  6. 6 . The plated steel sheet according to claim 1 , wherein the plated layer comprises, as the chemical composition, the group A.
  7. 7 . The plated steel sheet according to claim 1 , wherein the plated layer comprises, as the chemical composition, the group B.
  8. 8 . The plated steel sheet according to claim 1 , wherein the plated layer comprises, as the chemical composition, the group C.

Description

TECHNICAL FIELD The present invention relates to a plated steel sheet. Priority is claimed on Japanese Patent Application No. 2022-130521, filed Aug. 18, 2022, the content of which is incorporated herein by reference. BACKGROUND ART A Zn—Al—Mg-based hot-dip plated steel sheet having a hot-dip Zn-plated layer containing Al and Mg has excellent corrosion resistance. Therefore, Zn—Al—Mg-based hot-dip plated steel sheets are widely used, for example, as a material for structural members required to have corrosion resistance, such as building materials. For example, Patent Document 1 describes a plated steel material including a steel material and a plated layer including a Zn—Al—Mg alloy layer disposed on a surface of the steel material, in which the Zn—Al—Mg alloy layer has a Zn phase and contains a Mg—Sn intermetallic compound phase in the Zn phase, the plated layer includes, in mass %, Zn: more than 65.0%, Al: more than 5.0% to less than 25.0%, Mg: more than 3.0% to less than 12.5%, Sn: 0.1% to 20.0%, and impurities, and has a chemical composition satisfying the following formulas 1 to 5. Bi+I⁢n<SnFormula⁢ 1Y+La+C⁢e≤CaFormula⁢ 2Si<SnFormula⁢ 3O≤Cr+T⁢i+N⁢i+C⁢o+V+N⁢b+C⁢u+Mn<0.2⁢5Formula⁢ 4O≤Sr+S⁢b+P⁢b+B<0.5Formula⁢ 5 Patent Document 2 discloses a plated steel material including a steel material and a plated layer disposed on a surface of the steel material and including a Zn—Al—Mg alloy layer, in which in a cross section of the Zn—Al—Mg alloy layer, an area fraction of a MgZn2 phase is 45 to 75%, an area fraction of a total of the MgZn2 phase and an Al phase is 70% or more, and an area fraction of a Zn—Al—MgZn2 ternary eutectic structure is 0% to 5%, the plated layer includes, in mass %, Zn: more than 44.90% to less than 79.90%, Al: more than 15% to less than 35%, Mg: more than 5% to less than 20%, Ca: 0.1% to less than 3.0%, and impurities, and in a case where an element group A is Y, La, and Ce, an element group B is Cr, Ti, Ni, Co, V, Nb, Cu, and Mn, an element group C is Sr, Sb, and Pb, and an element group D is Sn, Bi, and In, the plated layer has a chemical composition in which a total content of elements selected from the element group A is 0% to 0.5%, a total content of Ca and the elements selected from the element group A is 0.1% to less than 3.0%, a total content of elements selected from the element group B is 0% to 0.25%, a total content of elements selected from the element group C is 0% to 0.5%, and a total content of elements selected from the element group D is 0% to 20.00%. Patent Document 3 describes a hot-dip Al—Zn—Mg—Si plated steel sheet including a plating film on a sheet surface, in which the plating film includes an interface alloy layer present at an interface with a base steel sheet and a main layer present on the alloy layer, the plating film contains 25 to 80 mass % of Al, more than 0.6 to 15 mass % of Si, and more than 0.1 to 25 mass % of Mg, and the area fraction of Mg2Si on the surface of the main layer is 10% or more. In recent years, hot-dip plated steel materials for building materials used for roofs, wall materials, and the like are required to be excellent in both surface corrosion resistance, which is the corrosion resistance of the plated layer itself, and cut edge corrosion resistance, which is the corrosion resistance of a cut end surface portion. On the other hand, a technique for achieving both surface corrosion resistance and cut edge corrosion resistance at a high level has not been studied. CITATION LIST Patent Document Patent Document 1: PCT International Publication No. WO 2018/139619Patent Document 2: PCT International Publication No. WO 2018/139620Patent Document 3: Japanese Unexamined Patent Application, First Publication No. 2016-166414 SUMMARY OF INVENTION Technical Problem The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a plated steel sheet which is excellent in both surface corrosion resistance and cut edge corrosion resistance. Solution to Problem In order to solve the above problem, the present invention employs the following configurations. [1]A plated steel sheet including: a steel sheet; and a plated layer arranged on a surface of the steel sheet, wherein the plated layer includes, as a chemical composition, in terms of mass %,Al: 10.0% to 25.0%,Mg: 3.0% to 10.0%,Fe: 0.01% to 2.00%,Si: more than 0.00% and 2.00% or less,at least one selected from a group consisting of following group A, group B, and group C, anda remainder consisting of Zn and impurities, andwhen the plated layer is subjected to grazing incidence X-ray diffraction measurement under conditions where Cu-Kα ray is used, an acceleration voltage as an X-ray output is 50 kV, and an X-ray incident angle against a surface of the plated layer is 1°, an X-ray diffraction intensity ratio between a (300) plane of a Mg21Zn25 phase and a (002) plane of an η-Zn phase (I (Mg21Zn25)/I (η-Zn)) is more than 0.3,herein,[