公开(公告)号：EP1491648A4

公开(公告)日：2009-04-15

申请号：EP03746164

申请日：2003-03-28

申请人： NIPPON STEEL CORP

发明人： HONMA HOTAKA ,  HIROTA YOSHIAKI ,  KONDO YASUMITSU ,  KUBO YUJI ,  SENUMA TAKEHIDE ,  NAKAMURA SHUICHI

IPC分类号： H01F1/147 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/14 ,  H01F41/02

CPC分类号： H01F41/0206 ,  C21D8/1222 ,  C22C38/02 ,  C22C38/14 ,  H01F1/14783

摘要： A unidirectional hot rolled magnetic steel sheet or strip or two-way directional hot rolled magnetic steel sheet or strip as a soft magnetic material for use in electrical appliances. In particular, a directional hot rolled magnetic steel sheet or strip with extremely high adherence to coating, which steel sheet or strip is composed of, in terms of mass%, 2.5 to 4.5% of Si, 0.01 to 0.4% of Ti, 0.005% or less of each of C, N, S and O and the remainder consisting essentially of Fe and unavoidable impurities, characterized in that a surface thereof is provided with a coating constituted of a C compound of Ti, or Ti and at least one member of Nb, Ta, V, Hf, Zr, Mo, Cr and W; and a process for producing the same.

公开(公告)号：EP1382717A4

公开(公告)日：2005-02-23

申请号：EP02720582

申请日：2002-04-23

申请人： NIPPON STEEL CORP

发明人： SHIGESATO GENICHI ,  FUJII HIROYASU ,  MURAKAMI KENICHI ,  USHIGAMI YOSHIYUKI ,  NAKAMURA SHUICHI ,  SUGIYAMA MASAAKI

IPC分类号： C21D8/12 ,  C23C8/02 ,  C23C8/10 ,  C23C8/80 ,  C23C28/00 ,  C23C28/04 ,  C23C30/00 ,  H01F1/147 ,  C23C22/00 ,  C21D9/46

CPC分类号： C21D8/1272 ,  C21D8/1283 ,  C21D8/1288 ,  C23C8/02 ,  C23C8/10 ,  C23C8/80 ,  C23C28/04 ,  C23C28/048 ,  C23C30/00 ,  H01F1/14783 ,  Y10T428/249953

摘要： A unidirectional silicon steel prepared by a method comprising a step of removing forsterite and the like by means of the washing with an acid or the like or a step of preventing the formation thereof and comprising forming an insulating coating film imparting a tensile force on a silicon steel being freed of forsterite and the like, characterized in that it has, in the interface of the insulating coating film imparting a tensile force and the steel sheet, one or more of an oxide film of exterior oxidation type containing an amorphous silica as a primary component and having an average film thickness of 2 nm to 500 nm and a mixed oxide of a film−like silica of exterior oxidation type containing an amorphous silica as a primary component and having an average film thickness in the same range as mentioned above and a particulate oxide containing an amorphous silica as a primary component, and satisfies one or more of the following requirements: a specific proportion of the particulate oxide to the oxide film, a specific limitation to the proportions of constituting elements, a specific limitation to the vacant space therein, a specific proportion of metallic iron and a specific average thickness of a layer having a reduced density.

公开(公告)号：EP1464712A4

公开(公告)日：2006-08-09

申请号：EP03701022

申请日：2003-01-07

申请人： NIPPON STEEL CORP

发明人： USHIGAMI YOSHIYUKI ,  NAKAMURA SHUICHI ,  FUJII HIROYASU ,  MURAKAMI KENICHI

IPC分类号： C21D9/46 ,  C21D1/70 ,  C21D1/76 ,  C21D8/12 ,  H01F1/16

CPC分类号： C21D8/1272 ,  C21D1/76 ,  C21D8/1255 ,  C21D8/1283

摘要： A method for producing a grain-oriented silicon steel plate with a mirror surface wherein a separation agent for annealing containing alumina as a main component is applied in the form of a water slurry, characterized in that the content of bound water in the separation agent for annealing after drying is 1.5 % or less, and the partial pressure of steam in an atmosphere, wherein finish annealing is performed, is controlled, to stabilize secondary recrystallization. The method allows the prohibition of variations (instability) in secondary recrystallization caused by reactions of inhibitors in an interface, which leads to the stablization of magnetic characteristics.