公开(公告)号：EP2455509A4

公开(公告)日：2014-05-14

申请号：EP10780689

申请日：2010-05-27

Applicant: JFE STEEL CORP

Inventor： OOI TOSHIHIKO ,  NAKAMARU HIROKI ,  OOTSUKA SHINJI ,  MASUOKA HIROYUKI ,  YOSHIDA MASAHIRO

IPC: C23C2/12 ,  B32B15/01 ,  C22C18/04 ,  C22C21/10 ,  C23C2/06

CPC classification number: C23C2/12 ,  B32B15/012 ,  B32B15/013 ,  C22C18/04 ,  C22C21/10 ,  C23C2/06 ,  Y10T428/12757 ,  Y10T428/12799

Abstract: A hot dip Al-Zn coated steel sheet exhibiting excellent corrosion resistance is provided. The Al content in a coated film is 20 to 95 percent by mass. Then, the Ca content in the above-described coated film is 0.01 to 10 percent by mass. Alternatively, the total content of Ca and Mg is 0.01 to 10 percent by mass. Furthermore, it is preferable that the coated film is composed of an upper layer and an alloy phase present at the interface to a substrate steel sheet, and Ca or Ca and Mg are contained primarily in the upper layer. Moreover, it is preferable that Ca or Ca and Mg include an intermetallic compound with at least one type selected from Zn, Al, and Si. In the case where Ca or Ca and Mg are contained in the coated film, as described above, these elements are contained in corrosion products generated in a bonded portion and exert effects of stabilizing the corrosion products and retarding proceeding of corrosion thereafter. Then, as a result, the corrosion resistance is improved.

公开(公告)号：EP2957648A4

公开(公告)日：2016-02-10

申请号：EP14746418

申请日：2014-01-24

Applicant: JFE STEEL CORP

Inventor： OOI TOSHIHIKO ,  OKUMA TOSHIYUKI ,  FURUTA AKIHIKO ,  YOSHIDA MASAHIRO ,  MATSUZAKI AKIRA ,  ANDO SATORU

IPC: C23C2/06 ,  C22C18/04 ,  C22C21/10 ,  C23C2/02 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40

CPC classification number: C23C2/06 ,  B32B15/012 ,  C22C18/04 ,  C22C21/00 ,  C22C21/02 ,  C22C21/08 ,  C22C21/10 ,  C23C2/02 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  Y10T428/12799

Abstract: Disclosed is a hot-dip Al-Zn alloy coated steel sheet having good corrosion resistance in flat parts as well as good workability and thereby has excellent corrosion resistance in worked parts. In the disclosure, the upper layer of the hot-dip coating has a composition containing Al in an amount of 20 mass% to 95 mass%, Si in an amount of 10 % or less of the Al content, at least one of Ca and Mg, the total content of Ca and Mg being 0.01 mass% to 10 mass%, and the balance including Zn and incidental impurities, and the mean Vickers hardness of the hot-dip coating is 50 Hv to 100 Hv.

公开(公告)号：EP3266900A4

公开(公告)日：2018-01-17

申请号：EP16759061

申请日：2016-03-02

Applicant: JFE GALVANIZING&COATING CO LTD ,  JFE STEEL CORP

Inventor： OOI TOSHIHIKO ,  SATO YOHEI ,  TOBIYAMA YOICHI ,  OKUMA TOSHIYUKI ,  FURUTA AKIHIKO ,  YOSHIDA MASAHIRO ,  SUZUKI YOSHITSUGU ,  ANDO SATORU ,  MATSUZAKI AKIRA

IPC: C23C2/12 ,  C23C2/28

CPC classification number: C22C18/04 ,  C22C21/10 ,  C22C30/06 ,  C23C2/12 ,  C23C2/28

Abstract: Provided is a hot-dip Al-Zn-Mg-Si coated steel sheet having good corrosion resistance in flat parts and edge parts, and also having excellent worked part corrosion resistance. The hot-dip Al-Zn-Mg-Si coated steel sheet includes a base steel sheet and a hot-dip coating on a surface of the base steel sheet. The hot-dip coating includes an interfacial alloy layer present at an interface with the base steel sheet and a main layer present on the interfacial alloy layer, and contains from 25 mass% to 80 mass% of Al, from greater than 0.6 mass% to 15 mass% of Si, and from greater than 0.1 mass% to 25 mass% of Mg. The Mg content and Si content in the hot-dip coating satisfy formula (1): M Mg / M Si ˆ’ 0.6 > 1.7 where M Mg represents the Mg content (mass%) and M Si represents the Si content (mass%).

公开(公告)号：EP2138599A4

公开(公告)日：2014-10-22

申请号：EP08740312

申请日：2008-04-07

Applicant: JFE STEEL CORP

Inventor： TAKAGI SHUSAKU ,  KAWABE HIDETAKA ,  HASEGAWA KOHEI ,  OOI TOSHIHIKO ,  OKITA YASUAKI ,  SAKURAI MICHITAKA

IPC: C22C38/38 ,  C21D6/00 ,  C21D8/02 ,  C21D8/04 ,  C21D9/46 ,  C21D9/48 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28

CPC classification number: C23C2/06 ,  C21D6/005 ,  C21D8/0426 ,  C21D8/0473 ,  C21D8/0478 ,  C21D9/46 ,  C21D9/48 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/02 ,  C23C2/28 ,  Y10T428/12799

Abstract: A high tensile-strength galvanized steel sheet, comprising: C: at least 0.05% but less than 0.12%, Si: at least 0.01% but less than 0.35%, Mn: 2.0% to 3.5%, P: 0.001% to 0.020%, S: 0.0001% to 0.0030%, Al: 0.005% to 0.1%, N: 0.0001% to 0.0060%, Cr: more than 0.5% but not more than 2.0%, Mo: 0.01% to 0.50%, Ti: 0.010% to 0.080%, Nb: 0.010% to 0.080%, and B: 0.0001% to 0.0030%, the remainder being Fe and unavoidable impurities, wherein the high tensile-strength galvanized steel sheet has a microstructure that contains 20% to 70% by volume ferrite having an average grain size of 5 µm or less. The high tensile-strength galvanized steel sheet has a tensile strength of at least 980 MPa, and excellent formability and weldability.