公开(公告)号：EP3235914A4

公开(公告)日：2017-11-08

申请号：EP15870358

申请日：2015-12-18

申请人： POSCO

发明人： HAN KYU-SEOK ,  JOO HYUNG DON ,  PARK JONG-TAE ,  SEO JIN-WOOK ,  KO HYUN-SEOK

IPC分类号： C21D8/12 ,  C21D9/52 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  H01F1/14 ,  H01F1/147 ,  H01F1/16

CPC分类号： C21D8/1255 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1244 ,  C21D9/46 ,  C21D9/52 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  H01F1/14 ,  H01F1/147 ,  H01F1/14775 ,  H01F1/16

摘要： A method for manufacturing a grain-oriented electrical steel sheet, according to an embodiment of the present invention includes: heating a slab, based on 100 wt% of a total composition thereof, including N at 0.0005 wt% to 0.015 wt%, Ti at 0.0001 wt% to 0.020 wt%, V at 0.0001 wt% to 0.020 wt%, Nb at 0.0001 wt% to 0.020 wt%, B at 0.0001 wt% to 0.020 wt%, and the remaining portion including Fe and other impurities, and then hot rolling it to prepare a hot-rolled steel sheet; annealing the hot-rolled steel sheet; after the hot-rolled steel sheet is annealed, cooling the hot-rolled steel sheet, and then cold rolling it to prepare a cold-rolled steel sheet; decarburization-annealing the cold-rolled steel sheet and then nitriding-annealing it, or simultaneously performing the decarburization-annealing and the nitriding-annealing; and final-annealing the decarburization-annealed and nitriding-annealed steel sheet.

公开(公告)号：EP1838882A4

公开(公告)日：2011-03-02

申请号：EP05821875

申请日：2005-12-20

申请人： POSCO CO LTD

发明人： CHOI JAE-YOUNG ,  BAE BYUNG-KEUN ,  PARK JONG-TAE ,  KIM JAE-KWAN ,  PARK CHEL-MIN

IPC分类号： C21D8/12

CPC分类号： C22C38/004 ,  C21D8/1205 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1272 ,  C21D9/46 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  H01F1/14791 ,  H01F1/16

摘要： The present invention relates to technology for manufacturing electrical steel sheets having excellent magnetic properties through the control of a hot-rolled texture using the phase transformation of steel. More particularly, it relates to a non-oriented electrical steel sheet that has reduced iron loss and increased magnetic flux density by controlling alloy component elements and optimizing hot-rolling conditions, even though hot-rolled sheet annealing is not carried out, as well as a manufacturing method thereof. More specifically, the invention provides a non-oriented electrical steel sheet which has excellent magnetic properties while hot-rolled sheet annealing can be omitted, the steel sheet being comprised of 0.005 wt % or less of C, 1.0-3.0 w % of Si, 0.1-2.0 wt % of Mn, 0.1 wt % or less of P, 0.1-1.5 wt % of Al, and a remainder of Fe and other inevitable impurities, in which the relationship between the elements Mn and Al satisfies an equation of −0.2

公开(公告)号：EP3239324A4

公开(公告)日：2018-01-24

申请号：EP15873580

申请日：2015-12-21

申请人： POSCO

发明人： KWON OH-YEOUL ,  LEE SEUNG GON ,  PARK HYUN-CHUL ,  PARK JUNG HUN ,  SEE SEONG-KYU ,  WON SUNG-YEUN ,  KIM JAE-KYOUM ,  PARK JONG-TAE ,  PARK SE MIN

IPC分类号： C22C38/02 ,  B23K26/0622 ,  B23K26/36 ,  B23K26/364 ,  B23K26/40 ,  B23K101/34 ,  B23K103/04 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C23C8/18 ,  H01F1/18

CPC分类号： C21D8/1283 ,  B23K26/0622 ,  B23K26/364 ,  B23K26/40 ,  B23K2201/34 ,  B23K2203/04 ,  C21D8/12 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1244 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1272 ,  C21D8/1288 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C8/18 ,  H01F1/18

摘要： Provided is an oriented electrical steel sheet including a groove existing on the surface of the electrical steel sheet and a forsterite layer formed on a part or all of the surface of the electrical steel sheet, in which forsterite which is extended from the forsterite layer and penetrates to a base steel sheet in an anchor form is present on the surface of the side of the groove.

公开(公告)号：EP3239325A4

公开(公告)日：2017-12-27

申请号：EP15873582

申请日：2015-12-21

申请人： POSCO

发明人： KWON OH-YEOUL ,  LEE WON-GUL ,  HONG SEONG-CHEOL ,  LEE GYOO-TAEK ,  PARK JONG-TAE ,  LIM CHOONG SOO

IPC分类号： C22C38/02 ,  B23K26/36 ,  C21D1/74 ,  C21D8/12 ,  C23C8/18

CPC分类号： C21D8/1283 ,  B23K26/36 ,  B23K26/364 ,  C21D8/1255 ,  C21D8/1272 ,  C21D8/1294 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/02 ,  C23C8/02 ,  C23C8/18 ,  C23C8/26 ,  C23C8/80

摘要： A grain-oriented electrical steel plate of an exemplary embodiment of the present invention has a groove formed on a surface, wherein a curvature radius RBb at a position where a depth of the groove is maximum is 0.2 µm to 100 µm, and a curvature radius RSb on the groove surface from the position where the depth of the groove is maximum to a quarter-way position of the depth D of the groove is 4 µm to 130 µm.