公开(公告)号：US20230415453A1

公开(公告)日：2023-12-28

申请号：US18035988

申请日：2021-11-29

Applicant: NIPPON STEEL CORPORATION

Inventor： Kosuke KAWAMOTO ,  Yasuto GOTO

IPC: B32B15/01 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C21D1/74 ,  C23C18/32 ,  C25D3/12

CPC classification number: B32B15/015 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C22C38/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0247 ,  C21D8/0278 ,  C21D9/46 ,  C21D1/74 ,  C23C18/32 ,  C25D3/12

Abstract: The surface-treated steel sheet includes an alloy layer containing Ni and Co. In a case where, in a cross section obtained by cutting the alloy layer in the thickness direction, a range having a width of 2000 nm and extending from the surface of the alloy layer to a depth of 100 nm is partitioned into regions each having a width of 100 nm and a depth of 100 nm, within the range the alloy layer includes a plurality of high Co concentration regions in each of which the ratio of a Co concentration to a sum of the Co concentration and a Ni concentration within the partitioned region is 0.8 or more, and a plurality of alloyed regions in each of which a ratio of the Co concentration to a sum of the Co concentration and the Ni concentration within the partitioned region is less than 0.8.

公开(公告)号：US20230407509A1

公开(公告)日：2023-12-21

申请号：US18036877

申请日：2021-11-29

Applicant: NIPPON STEEL CORPORATION

Inventor： Kosuke KAWAMOTO ,  Yasuto GOTO ,  Yuta DAIROKUNO ,  Koki SHIMADA

IPC: C25D5/12 ,  C21D9/46 ,  C25D5/36 ,  C25D5/50 ,  C25D3/12

CPC classification number: C25D5/12 ,  C21D9/46 ,  C25D3/12 ,  C25D5/50 ,  C25D5/36

Abstract: A surface-treated steel sheet of the present disclosure includes a steel sheet, and an alloy layer containing Ni and Co on a surface of the steel sheet. A surface roughness Ra1 of the surface of the alloy layer over a sampling length of 5.0 mm in the width direction of the steel sheet is 2.0 μm or less. Ra2 that denotes the arithmetic mean height of a roughness curve of the surface of the alloy layer over a sampling length of 10 μm in the width direction of the steel sheet is 20 nm or less, and RSm that denotes the mean length of roughness curve elements over the sampling length of 10 μm in the width direction of the steel sheet is 700 nm or more, Ra2 and RSm being measured using an atomic force microscope.

公开(公告)号：US20240183013A1

公开(公告)日：2024-06-06

申请号：US18285516

申请日：2022-03-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Kosuke KAWAMOTO ,  Yasuto GOTO ,  Masaharu OKA ,  Yuta DAIROKUNO ,  Yuji KAJII ,  Koki SHIMADA

IPC: C22C38/04 ,  C22C38/00 ,  C22C38/06 ,  C25D3/12 ,  C25D5/12 ,  C25D5/50

CPC classification number: C22C38/04 ,  C22C38/002 ,  C22C38/06 ,  C25D3/12 ,  C25D5/12 ,  C25D5/50

Abstract: A surface-treated steel sheet is provided that has excellent strength even when the surface-treated steel sheet is provided with a Ni—Co—Fe alloy layer. A surface-treated steel sheet of the present disclosure includes a steel sheet, and a Ni—Co—Fe alloy layer on a steel sheet surface. The steel sheet has a microstructure containing: ferrite, and one or more kinds selected from the group consisting of cementite, pearlite, and bainite having an area fraction of 1.2 to 5.0% in total. The Ni—Co—Fe alloy layer contains Ni, Co and Fe.

公开(公告)号：US20240167184A1

公开(公告)日：2024-05-23

申请号：US18284561

申请日：2022-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Kosuke KAWAMOTO ,  Yasuto GOTO ,  Katsumasa MATSUMOTO ,  Tatsuo NAGATA

IPC: C25D5/14 ,  C25D3/12 ,  C25D7/06

CPC classification number: C25D5/14 ,  C25D3/12 ,  C25D7/0614

Abstract: A surface-treated steel sheet according to one embodiment of the present invention includes a base steel sheet and a plating layer containing Ni and W which is provided on the surface of the base steel sheet, and in a region from the outmost surface of the plating layer to a depth of 150 nm, a proportion (unit atomic %) of the average W concentration with respect to a total of the average Ni concentration, the average W concentration, and the average Fe concentration is 2.0 to 20.0 atomic %, and in a region of the plating layer from a depth of 150 nm to a depth of 300 nm, the proportion (unit atomic %) of the average W concentration with respect to the total of the average Ni concentration, the average W concentration, and the average Fe concentration is 0.7 times or less the proportion in the region from the outmost surface of the plating layer to a depth of 150 nm.

公开(公告)号：US20230407510A1

公开(公告)日：2023-12-21

申请号：US18035745

申请日：2021-11-29

Applicant: NIPPON STEEL CORPORATION

Inventor： Yasuto GOTO ,  Kosuke KAWAMOTO ,  Yuta DAIROKUNO ,  Yuji KAJII ,  Koki SHIMADA

IPC: C25D5/50 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C21D1/74 ,  C25D3/12 ,  C25D3/56 ,  C25D5/12

CPC classification number: C25D5/50 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/004 ,  C22C38/002 ,  C22C38/001 ,  C21D9/46 ,  C21D8/0205 ,  C21D8/0221 ,  C21D8/0278 ,  C21D6/005 ,  C21D6/008 ,  C21D1/74 ,  C25D3/12 ,  C25D3/562 ,  C25D5/12 ,  C21D2251/02

Abstract: A surface-treated steel sheet 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.