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公开(公告)号：US20240084833A1
公开(公告)日：2024-03-14
申请号：US18271402
申请日：2021-12-24
摘要： The present disclosure inhibits liquid metal embrittlement (LME) cracking and improves corrosion resistance in a welded joint obtained by spot welding a first steel sheet and a second steel sheet. In the welded joint of the present disclosure, a first plating layer is provided on a surface of the first steel sheet facing the second steel sheet, no plating layer is present on or a second plating layer is provided on a surface of the second steel sheet facing the first steel sheet, a boundary plating layer is provided between the first steel sheet and the second steel sheet in a range of 0.5 mm from an end part of the corona bond of the spot welded part toward an outside of the spot welded part, and a Zn penetrated part is present at least at one of the first steel sheet and the second steel sheet adjoining the boundary plating layer. The Zn penetrated part advances from the boundary plating layer along the steel grain boundary, an Mg concentration at a front end of the Zn penetrated part at a location where a Zn concentration is 0.1 mass % is 0.20 mass % or less, and the first plating layer and the second plating layer satisfy a predetermined Relation I.
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公开(公告)号：US20230407448A1
公开(公告)日：2023-12-21
申请号：US18251629
申请日：2022-01-14
IPC分类号： C23C2/06 , C22C21/10 , C22C38/02 , C22C38/04 , C21D9/46 , C21D1/74 , C21D1/84 , C21D8/02 , C22C21/02 , C22C21/00 , B32B15/01
CPC分类号： C23C2/06 , C22C21/10 , C22C38/02 , C22C38/04 , C21D9/46 , C21D1/74 , C21D1/84 , C21D8/0205 , C21D8/0278 , C22C21/02 , C22C21/00 , B32B15/011 , C21D2251/02 , C21D2261/00 , B23K11/11
摘要： This plated steel includes: a steel; and a plating layer formed on the steel, in which the plating layer contains, as a chemical composition, by mass %, Zn: 1.0% to 30.0%, Mg: 0% to 10.0%, Si: 0.05% to 10.0%, Fe: 0 to 10.0%, 0% to 5.00% in total of one or two or more selected from Ca: 0% to 3.00%, Sb: 0% to 0.50%, Pb: 0% to 0.50%, Sr: 0% to 0.50%, Sn: 0% to 1.00%, Cu: 0% to 1.00%, Ti: 0% to 1.00%, Ni: 0% to 1.00%, Mn: 0% to 1.00%, Cr: 0% to 1.00%, La: 0% to 1.00%, Ce: 0% to 1.00%, Zr: 0% to 1.00%, and Hf: 0% to 1.00%, and a remainder of Al and impurities, a microstructure of the plating layer contains an α phase which is a solid solution of Al and Zn, and the α phase contains a Zn phase having a grain size of 10 to 200 nm in a number density of 10/100 μm2 or more.
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公开(公告)号：US20240336996A1
公开(公告)日：2024-10-10
申请号：US18703998
申请日：2022-08-16
发明人： Kohei TOKUDA , Mamoru SAITO , Yuto FUKUDA , Yasuto GOTO , Yasuhiro MAJIMA , Naoyuki YAMATO , Fumiaki NAKAMURA , Hidetoshi SHINDO , Koji KAWANISHI , Kenichiro MATSUMURA , Hiroshi TAKEBAYASHI
CPC分类号： C22C18/04 , C23C30/005
摘要： A plated steel sheet comprises a plated layer on a surface of a steel sheet, in which in the plated layer, the total amount ΣA of Sn, Bi, and In is less than 0.75%, the total amount ΣB of Ca, Y, La, and Ce is 0.03 to 0.60%, the total amount ΣC of Cr, Ti, Ni, Co, V, Nb, Cu, and Mn is 0 to 1.00%, Sn≤Si, and 20.0≤Mg/Si are satisfied, and in an X-ray diffraction pattern of a surface of the plated layer, an X-ray diffraction peak of Al2.15Zn1.85Ca, an X-ray diffraction peak of CaZn2, and an X-ray diffraction peak of η′-MgZn2 satisfy a predetermined relationship.
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公开(公告)号：US20240318288A1
公开(公告)日：2024-09-26
申请号：US18579732
申请日：2022-09-30
IPC分类号： C22C38/38 , B32B15/01 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/32 , C22C38/34
CPC分类号： C22C38/38 , B32B15/013 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/32 , C22C38/34
摘要： High strength plated steel sheet excellent in LME resistance, that is, plated steel sheet comprising steel sheet and a plating layer containing Zn on the same, in which the steel sheet has a tensile strength of 780 MPa or more, the steel sheet has a chemical composition containing, by mass %,
C: 0.05 to 0.40%,
Si: 0.2 to 3.0%,
Mn: 0.1 to 5.0%,
sol. Al: 0.4 to 1.50%, etc. and having a balance of Fe and impurities, and,
in any vertical cross section of the steel sheet, ferrite phases with a circle equivalent diameter of 1 μm or less are contained in a region from a surface layer down to a depth of 2 μm in a number density of 2 to 30/μm2 and the ferrite phases include internal oxides with a circle equivalent diameter of 2 to 100 nm in a number density of 3/μm2 or more.-
公开(公告)号：US20240218491A1
公开(公告)日：2024-07-04
申请号：US18288223
申请日：2021-04-27
IPC分类号： C22C38/38 , C21D1/74 , C21D6/00 , C21D8/02 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/34 , C23C2/06
CPC分类号： C22C38/38 , C21D1/74 , C21D6/001 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0252 , C21D8/0263 , C21D8/0278 , C21D9/46 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/34 , C23C2/06
摘要： A steel sheet comprising, by mass %, C: 0.05 to 0.40%, Si: 0.2 to 3.0%, and Mn: 0.1 to 5.0%, wherein a surface layer of the steel sheet contains grain boundary oxides, a Ratio A of a length of the grain boundary oxides projected on a surface of the steel sheet to a length of the surface of the steel sheet is 50% or more and 100% or less, a number density of granular oxides is less than 4.0/μm2, the steel sheet comprises an Si—Mn depleted layer having a thickness of 3.0 μm or more from the surface of the steel sheet, and Si and Mn contents of the Si—Mn depleted layer at the ½ position of the thickness and not containing oxides are respectively less than 10% of the Si and Mn contents at a sheet thickness center part of the steel sheet, and a plated steel sheet using the same are provided.
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公开(公告)号：US20240141469A1
公开(公告)日：2024-05-02
申请号：US18272712
申请日：2022-03-14
IPC分类号： C23C2/06 , C21D6/00 , C21D8/02 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/38 , C23C2/02 , C23C2/16 , C23C2/28
CPC分类号： C23C2/06 , C21D6/001 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0236 , C21D8/0252 , C21D8/0278 , C21D9/46 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/38 , C23C2/022 , C23C2/16 , C23C2/285
摘要： High strength plated steel sheet having high hydrogen embrittlement resistance, that is, alloyed hot dip galvannealed steel sheet including steel sheet containing C: 0.05 to 0.40%, Si: 0.2 to 3.0%, Mn: 0.1 to 5.0%, and sol. Al: 0.4 to 1.50% and a alloyed hot dip galvannealed layer deposited on at least one surface of the steel sheet to 10 to 100 g/m2 and containing Fe: 5.0 to 15.0% and Al: 0.01 to 1.0%, having an internal oxidation layer including grain boundary oxides in a surface layer of the steel sheet, when examining a cross-section of a surface layer of the steel sheet, a Ratio A of the length of the grain boundary oxides projected an interface of the steel sheet and the alloyed hot dip galvannealed layer to the length of interface is 50% or more and 100% or less, and a surface depleted layer with a steel composition not including the grain boundary oxides which satisfies, by mass %, Si≤0.6% and Al≥0.05% is included at a depth of ½ of the average depth of the internal oxidation layer.
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公开(公告)号：US20240084422A1
公开(公告)日：2024-03-14
申请号：US18285460
申请日：2023-03-23
CPC分类号： C22C18/04 , B32B15/013 , C23C2/06
摘要： The hot-dip plated steel material includes a steel material and a hot-dip plated layer disposed on a surface of the steel material, the hot-dip plated layer has a certain chemical composition, and the hot-dip plated layer has a diffraction intensity obtained from a result of X-ray diffraction measurement, the diffraction intensity satisfying a certain relationship.
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公开(公告)号：US20230295775A1
公开(公告)日：2023-09-21
申请号：US18040903
申请日：2021-08-19
CPC分类号： C22C18/04 , B32B15/013 , C23C2/06 , C23C2/40
摘要： A plated steel sheet includes: a steel sheet; and a plating layer that is formed on at least a part of a surface of the steel sheet, in which a chemical composition of the plating layer includes, b mass %, Al: 6.00% to 35.00 %, Mg: 3.00% to 15.00%, La+Ce: 0.0001% to 0.5000% in total, and Zn, and in a surface of the plating layer, the area ratio of a lamellar structure in which an (Al—Zn) phase and a MgZn2 phase are arranged in layers is 10% to 95%, the lamellar spacing of the lamellar structure is 2.5 μm or less, and the area ratio of an (Al—Zn) dendrite is 10% or less.
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公开(公告)号：US20220298646A1
公开(公告)日：2022-09-22
申请号：US17636486
申请日：2020-08-28
摘要： A hot stamped steel includes a base material, a plated layer that is formed on a surface of the base material, and an oxide film that is formed on a surface of the plated layer; chemical composition of the plated layer contains 20.00 to 45.00 mass % of Al, 10.00 to 45.00 mass % of Fe, 4.50 to 15.00 mass % of Mg, 0.10 to 3.00 mass % of Si, 0.05 to 3.00 mass % of Ca, 0 to 0.50 mass % of Sb, 0 to 0.50 mass % of Pb, 0 to 1.00 mass % of Cu, 0 to 1.00 mass % of Sn, 0 to 1.00 mass % of Ti, 0 to 0.50 mass % of Sr, 0 to 1.00 mass % of Cr, 0 to 1.00 mass % of Ni, and 0 to 1.00 mass % of Mn with a remainder of Zn and impurities; and chemical composition of the oxide film contains 20.0 to 55.0 at % of Mg, 0.5 to 15.0 at % of Ca, 0 to 15.0 at % of Zn, and 0 at % or more and less than 10.0 at % of Al with a remainder of O and a total of 5.0 at % or less of impurities, and the adhesion amount of the oxide film per one surface is in a range of 0.01 to 10 g/m2.
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公开(公告)号：US20240359252A1
公开(公告)日：2024-10-31
申请号：US18579759
申请日：2022-09-30
IPC分类号： B23K11/11 , B23K11/16 , B23K103/04 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C23C2/06 , C23C2/40
CPC分类号： B23K11/11 , B23K11/166 , C21D9/46 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C23C2/06 , C23C2/40 , B23K2103/04
摘要： A steel welded member having a high LME resistance of a spot weld, i.e., a steel welded member comprised of a plurality of Zn-based plated steel materials, each comprised of a steel material and a Zn-based plating layer on its surface, joined by at least one spot weld, in which
at least one of the Zn-based plated steel materials has a 780 MPa or more tensile strength, that steel material has a chemical composition containing, by mass %,
C: 0.05 to 0.40%,
Si: 0.2 to 3.0%,
Mn: 0.1 to 5.0%,
sol. Al: 0.4 to 1.50%, etc. and having a balance of Fe and impurities, and,
in a region of 10 to 300 μm from an end of a pressure weld of the spot weld, a difference of a Zn penetration depth of Zn from a Zn-based plating layer penetrating a steel material minus a depth of an internal oxidation layer formed at the steel material is within 0.1 to 10.0 μm in range.
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