公开(公告)号：EP1142699A4

公开(公告)日：2004-12-08

申请号：EP00954992

申请日：2000-08-24

申请人： JFE STEEL CORP

发明人： HAMAHARA KYOKO ,  NAKAKOJI HISATADA ,  MOCHIZUKI KAZUO

IPC分类号： B05D7/00 ,  C23C28/00 ,  B32B15/08

CPC分类号： B05D7/51 ,  C23C28/00 ,  C23C28/3225 ,  C23C28/345 ,  Y10T428/12493 ,  Y10T428/31663

摘要： The present invention provides a coated steel sheet of a zinc-based plated steel sheet which has a zinc phosphate-based coating containing magnesium thereon and a silicone resin coating containing a functional group which reacts with an organic substance on the surface of the zinc phosphate-based coating. The coated steel sheet has superior perforative corrosion resistance, paint adhesion, electrodeposition paintability, press formability, and weldability without using chromium and therefore is useful as an anti-corrosive steel sheet for automobile bodies.

公开(公告)号：EP1342801A4

公开(公告)日：2004-12-29

申请号：EP01963566

申请日：2001-09-10

申请人： JFE STEEL CORP

发明人： ISHII KAZUHIDE ,  KYONO KAZUAKI ,  KATO CHIAKI ,  MOCHIZUKI KAZUO

IPC分类号： C21D8/02 ,  C22C38/04 ,  C22C38/12 ,  C23C2/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/48

CPC分类号： C21D8/0278 ,  C22C38/04 ,  C22C38/12 ,  C23C2/02 ,  Y10T428/12757 ,  Y10T428/12799 ,  Y10T428/12951

摘要： A method for producing a high tensile strength hot dip plated steel sheet, which comprises providing a steel sheet having a Si content controlled within a specific range and comprising Nb and one or more of Cu, Ni and Mo, subjecting a rolled sheet to a recrystallization annealing to thereby form an inner oxide layer close under the surface of the steel plate, washing the surface with an acid to remove the oxides having been formed also on the surface, heating the resultant steel sheet prior to plating, and then subjecting the sheet to a hot dip plating. The inner oxide layer formed during annealing acts as a barrier against diffusion of Si, Mn and the like during the heat treatment prior to plating, which results in marked reduction of the formation of oxides of Si, Mn and the like. Accordingly, the method can be used for producing a high tensile strength hot dip plated steel sheet which exhibits markedly excellent plating characteristics.

公开(公告)号：EP1270764A4

公开(公告)日：2008-04-02

申请号：EP01976836

申请日：2001-10-26

申请人： JFE STEEL CORP

发明人： SHIGEKUNI TOMOFUMI ,  NAKAKOJI HISATADA ,  MOCHIZUKI KAZUO ,  KATO CHIAKI

IPC分类号： C23C28/00 ,  C25D5/26 ,  C22C38/00 ,  C22C38/08 ,  C23C2/08 ,  C23C22/07 ,  C23C22/08 ,  C23C22/10 ,  C23C22/78 ,  C23C30/00 ,  C25D5/48 ,  C25D5/50 ,  C25D7/00

CPC分类号： C23C22/08 ,  C23C2/08 ,  C23C2/285 ,  C23C28/321 ,  C23C28/34 ,  C23C2222/20 ,  C25D5/48 ,  Y10T428/12389 ,  Y10T428/12396 ,  Y10T428/12569 ,  Y10T428/12722 ,  Y10T428/12937 ,  Y10T428/12958

摘要： A surface treated tin-plated steel sheet which has (1) an alloy layer formed on the surface of a steel sheet, (2) a tin plating layer being formed on said alloy layer with a remaining exposed portion of the alloy layer having an area of 3.0 % or more of that of said alloy layer and, formed on said tin plating layer and said exposed portion of the alloy layer, (3) a coating film containing P and Si in an amount of 0.5 to 100 mg/m and 0.1 to 250 mg/m , respectively; and a chemical treatment solution for use in preparing the steel sheet which comprises a phosphate ion, a tin ion and a silane coupling agent and has a pH of 1.5 to 5.5. The surface treated tin-plated steel sheet is free from chromium which causes problems from an environmental view point, and also is excellent in adhesion with a paint, corrosion resistance after being coated, rust resistance, and formability.

公开(公告)号：EP1146145A4

公开(公告)日：2007-04-18

申请号：EP00957125

申请日：2000-09-12

申请人： JFE STEEL CORP

发明人： HAMAHARA KYOKO ,  NAKAKOJI HISATADA ,  MOCHIZUKI KAZUO

IPC分类号： C23C22/18 ,  C23C22/36 ,  C23C22/83 ,  C23C22/22 ,  C23C22/07 ,  C23C22/08

CPC分类号： C23C22/188 ,  C23C22/368 ,  C23C22/83 ,  Y10T428/12611 ,  Y10T428/1266 ,  Y10T428/12799 ,  Y10T428/12951

摘要： A surface treated steel sheet comprising a zinc-based metal plated steel sheet, a Mg-containing zinc phosphate based coating film formed on the surface thereof and, formed on the surface of the zinc phosphate based coating film, a coating film containing orthophosphate ester; and a method for producing the steel sheet. The surface treated steel sheet does not suffer from the fallout of a coating film in a chemical treatment process of an automobile production line and is excellent in the resistance to pitting, chemical treatment characteristics and press forming characteristics either when used without further coating or when used after electrodeposition coating.