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：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.

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.