公开(公告)号：US20220154319A1

公开(公告)日：2022-05-19

申请号：US17441578

申请日：2020-03-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA ,  Masafumi AZUMA ,  Yoichiro MORI ,  Shinji KODAMA ,  Masahiro MATSUBA

IPC: C22C38/58 ,  B62D27/02 ,  C22C38/02 ,  C22C38/06 ,  C22C38/54 ,  C22C38/48 ,  C22C38/50 ,  C22C38/46 ,  B23K35/30

Abstract: An automobile undercarriage part of the present invention has a welded joint formed by base steel plate, wherein the chemical composition of a weld metal contains, with respect to a total mass of the weld metal, by mass %, C: 0.02% to 0.30%, Si: 0.10% to less than 1.0%, Mn: 1.2% to 3.0%, Al: 0.002% to 0.30%, Ti: 0.005% to 0.30%, P: more than 0% to 0.015%, and S: more than 0% to 0.030%, the following formula (1A), formula (1B), formula (2), and formula (3) are satisfied, and slag in a toe portion of the fillet weld satisfies a formula (4). [Al]+[Ti]>0.05  Formula (1A) [Ti]/[Al]>0.9  Formula(1B) 7×[Si]+7×[Mn]−112×[Ti]−30×[Al]≤12  Formula (2) 2.0 [Si content on slag surface]  Formula (4).

公开(公告)号：US20210086313A1

公开(公告)日：2021-03-25

申请号：US16759784

申请日：2018-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinji KODAMA ,  Masahiro MATSUBA ,  Masafumi AZUMA ,  Yoichiro MORI ,  Kenichiro OTSUKA ,  Tetsuro NOSE ,  Tomokatsu IWAKAMI ,  Kazutaka MARUYAMA

IPC: B23K35/30 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B23K35/02 ,  B23K9/00

Abstract: This wire for gas-shielded arc welding is a wire for joining a plurality of thin steel sheets by gas-shielded arc welding, the wire including, in mass %, with respect to a total mass of the wire: C: 0.06 to 0.15%; Si: more than 0 to 0.18%; Mn: 0.3 to 2.2%; Ti: 0.06 to 0.30%; Al: 0.001 to 0.30%; and B: 0.0030 to 0.0100%, in which Si, Mn, Ti, and Al satisfy Expressions (1) and (2). Si×Mn≤0.30  Expression (1) (Si+Mn/5)/(Ti+Al)≤3.0  Expression (2)

公开(公告)号：US20220220595A1

公开(公告)日：2022-07-14

申请号：US17442803

申请日：2020-03-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA ,  Masafumi AZUMA ,  Yoichiro MORI ,  Shinji KODAMA ,  Masahiro MATSUBA

IPC: C22C38/14 ,  C22C38/04 ,  C22C38/06 ,  C22C38/02 ,  B23K35/30

Abstract: An automobile undercarriage part of the present invention is an automobile undercarriage part including a welded joint in which a first steel sheet and a second steel sheet are overlapped and a fillet weld is formed between an end surface of the first steel sheet and a surface of the second steel sheet, in which a chemical composition of a weld metal that forms the welded joint contains, with respect to a total mass of the weld metal, by mass %, C: 0.02% to 0.20%, Si: more than 0% to less than 0.10%, Mn: 0.3% to 2.0%, Al: 0.002% to 0.30%, Ti: 0.005% to 0.30%, P: more than 0% to 0.015%, and S: more than 0% to 0.030%, and the following formula (1) and formula (2) are satisfied. [Al]+[Ti]>0.05   Formula (1) 7×[Mn]−112×[Ti]−30×[Al]≤4.0   Formula (2)

公开(公告)号：US20190330478A1

公开(公告)日：2019-10-31

申请号：US16461736

申请日：2016-11-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Yasuaki KAWAMURA ,  Yoichiro MORI ,  Ikuro YAMAOKA

IPC: C09D5/08 ,  C09D201/00 ,  C09D5/24 ,  C08K3/38 ,  C08K3/28 ,  B05D7/00 ,  B05D7/14 ,  C08K3/22

Abstract: A coated steel sheet has a coating film on at least one side of a plated steel sheet. The coating film contains a binder resin, non-oxide ceramic particles containing V (excluding VC particles), and doped zinc oxide particles. The respective contents of the non-oxide ceramic particles containing V and the doped zinc oxide particles relative to the coating film satisfy the expressions: [(1) CZn≥10.0, (2) CV≤0.5·CZn, (3) CV≤70−CZn, (4) CV≥0.125·CZn, and (5) CV≥2.0], where CV represents the content (mass %) of the non-oxide ceramic particles containing V, and CZn represents the content (mass %) of the doped zinc oxide particles. The coated steel sheet is excellent in both corrosion resistance before electrodeposition coating, and weldability.