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2. 发明公开

EP4242352A1 SURFACE-TREATED STEEL SHEET 审中-实审
公开(公告)号：EP4242352A1
公开(公告)日：2023-09-13
申请号：EP21900521.2
申请日：2021-11-29
申请人： NIPPON STEEL CORPORATION
发明人： GOTO, Yasuto , KAWAMOTO, Kosuke , DAIROKUNO, Yuta , KAJII, Yuji , SHIMADA, Koki
IPC分类号： C25D5/12 , C25D5/26 , C25D5/48 , C25D5/50 , H01M50/10
摘要： A surface-treated steel sheet in which contact resistance is low and which can suppress the occurrence of a change in the color of the surface thereof is provided. A surface-treated steel sheet of the present disclosure includes a steel sheet, and an Ni-Co-Fe alloy layer containing Ni, Co, and Fe on the steel sheet surface. In the thickness direction of the Ni-Co-Fe alloy layer, a Co concentration in the Ni-Co-Fe alloy layer is highest at a position which is on an outermost surface side of the Ni-Co-Fe alloy layer relative to a position where the Ni concentration is highest in the Ni-Co-Fe alloy layer, and which is between the outermost surface of the Ni-Co-Fe alloy layer and a depth of 100 nm from the outermost surface. In the Ni-Co-Fe alloy layer, an Ni-concentrated region in which the Ni concentration increases toward the outermost surface of the Ni-Co-Fe alloy layer is formed between the outermost surface of the Ni-Co-Fe alloy layer and the position where the Co concentration is highest.

3. 发明授权

EP3255180B1 METHOD OF MANUFACTURING A CHEMICALLY TREATED SN PLATED STEEL SHEET 有权转让
公开(公告)号：EP3255180B1
公开(公告)日：2022-12-28
申请号：EP16746740.6
申请日：2016-02-08
发明人： GOTO, Yasuto , FUTABA, Takashi
IPC分类号： C25D5/26 , C25D3/30 , C25D9/10 , C25D3/32 , C25D5/36

5. 发明公开

EP4023789A1 SN-PLATED STEEL SHEET 审中-公开
公开(公告)号：EP4023789A1
公开(公告)日：2022-07-06
申请号：EP19956940.1
申请日：2019-12-19
申请人： NIPPON STEEL CORPORATION
发明人： YAMANAKA, Shintaro , HIRANO, Shigeru
IPC分类号： C23C28/00 , C25D5/26 , C25D9/08
摘要： To provide a Sn-based plated steel sheet excellent in yellowing resistance, coating film adhesiveness, and sulfurization blackening resistance without performing the conventional chromate treatment.
A Sn-based plated steel sheet of the present invention includes: a steel sheet; a Sn-based plating layer located on at least one surface of the steel sheet; and a coating layer located on the Sn-based plating layer, wherein: the Sn-based plating layer contains 0.10 to 15.00 g/m 2 of Sn per side in terms of metal Sn; the coating layer contains a Zr oxide and a Mn oxide; a content of the Zr oxide is 0.20 to 50.00 mg/m 2 per side in terms of metal Zr; a content of the Mn oxide in terms of metal Mn is 0.01 to 0.50 times on a mass basis relative to the content of the Zr oxide in terms of metal Zr; and a depth position A where an element concentration of Mn is maximum is located on a side closer to a surface of the coating layer than a depth position B where an element concentration of Zr is maximum, and a distance in a depth direction between the depth position A and the depth position B is 2 nm or more in an element analysis in the depth direction by XPS.

6. 发明公开

EP3819405A1 SURFACE-TREATED STEEL SHEET AND METHOD FOR PRODUCING SURFACE-TREATED STEEL SHEET 审中-公开
公开(公告)号：EP3819405A1
公开(公告)日：2021-05-12
申请号：EP19830027.9
申请日：2019-07-05
申请人： NIPPON STEEL CORPORATION
发明人： TAKAHASHI Takehiro , SAITO Mamoru , ISHIZUKA Kiyokazu , GOTO Yasuto
IPC分类号： C25D5/12 , C22C38/00 , C22C38/14 , C25D5/26 , C25D5/50 , C25D7/00 , H01M2/02 , H01M4/66 , C21D9/46
摘要： A surface-treated steel sheet of the present invention includes a base steel sheet and a Ni-Co-Fe alloy-plated layer on at least one surface of the base steel sheet, in which, in the alloy-plated layer, a Ni coating weight is 7.1 to 32.5 g/m 2 , a Co coating weight is 0.65 to 5.2 g/m 2 , and a total of the Ni coating weight and the Co coating weight is in a range of 9.0 to 35.0 g/m 2 . In an outermost layer of the alloy-plated layer, a Co concentration is in a range of 20 to 60 atom%, and a Fe concentration is in a range of 5 to 30 atom%. In the alloy-plated layer, a region having a thickness of 2 µm or more, in which a total of a Ni concentration and the Co concentration is 10 atom% or more and the Fe concentration is 5 atom% or more, is present, and the base steel sheet has a predetermined chemical composition, and a ferrite grain size number is 9.0 or more.

8. 发明公开

EP3741878A1 HIGH STRENGTH ALLOYED ELECTROLYTIC ZINC-PLATED STEEL SHEET AND METHOD FOR PRODUCING SAME 有权
公开(公告)号：EP3741878A1
公开(公告)日：2020-11-25
申请号：EP18901386.5
申请日：2018-12-13
申请人： JFE Steel Corporation
发明人： AOYAMA Mai , TSUCHIMOTO Kazuaki , FUSHIWAKI Yusuke
IPC分类号： C22C38/00 , C21D9/46 , C22C38/04 , C22C38/60 , C25D5/26 , C25D5/50
摘要： Provided are a high-strength electrogalvannealed steel sheet that has a TS of 780 MPa or higher, has good formability and high delayed fracture resistance, and has excellent surface appearance and high coating adhesion, and a method for manufacturing the high-strength electrogalvannealed steel sheet.
The high-strength electrogalvannealed steel sheet has a composition including, in terms of % by mass, C: 0.030% or more and 0.250% or less, Si: 0.01% or more and 3.00% or less, Mn: 1.00% or more and 10.00% or less, P: 0.001% or more and 0.100% or less, and S: 0.0001% or more and 0.0200% or less, with the balance being Fe and unavoidable impurities. The steel sheet has an electrogalvannealed coating layer on a surface thereof. The electrogalvannealed coating layer has an Fe content of 8.0% to 15.0%. The steel sheet has a tensile strength of 780 MPa or higher. The steel sheet has a diffusible hydrogen content of 0.2 wt. ppm or less.

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