公开(公告)号：US20190323105A1

公开(公告)日：2019-10-24

申请号：US16472249

申请日：2017-12-21

Applicant: POSCO

Inventor： Chang Soo Park ,  Kyu-Seok Han ,  Hyung Don Joo ,  Jae Kyoum Kim ,  Woo-Sin Kim

IPC: C21D9/46 ,  C22C38/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D1/74

Abstract: A grain-oriented electrical steel sheet of an embodiment of the present invention comprises Si: 1.0% to 7.0% and Y: 0.005% to 0.5% by wt %, and the remainder comprising Fe and other inevitable impurities, and 10 pieces or less of inclusions comprising Y and having a diameter of 30 nm to 5 μm per area of 1 mm2.

公开(公告)号：US12051529B2

公开(公告)日：2024-07-30

申请号：US17415815

申请日：2019-12-18

Applicant: POSCO

Inventor： Oh-Yeoul Kwon ,  Woo-Sin Kim ,  Jong-Tae Park

IPC: H01F1/16 ,  B23K26/364 ,  H01F41/02 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46

CPC classification number: H01F1/16 ,  B23K26/364 ,  H01F41/0233 ,  C21D6/008 ,  C21D8/1233 ,  C21D8/1272 ,  C21D9/46

Abstract: A manufacturing method of a grain-oriented electrical steel sheet according to an embodiment of the present invention, includes: manufacturing a cold-rolled sheet; forming a groove by irradiating a laser beam on the cold-rolled sheet; and partially removing an oxide layer formed on a surface of the cold-rolled sheet so that a thickness of the oxide layer remains at 1 to 5 nm, wherein the grain-oriented electrical steel sheet has islands of 0.25 or less having sphericity of 0.5 to 0.9 under the oxide layer under the groove.

公开(公告)号：US11608540B2

公开(公告)日：2023-03-21

申请号：US16472249

申请日：2017-12-21

Applicant: POSCO

Inventor： Chang Soo Park ,  Kyu-Seok Han ,  Hyung Don Joo ,  Jae Kyoum Kim ,  Woo-Sin Kim

IPC: C21D9/46 ,  C21D1/74 ,  C21D6/00 ,  C21D8/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16

Abstract: A grain-oriented electrical steel sheet of an embodiment of the present invention comprises Si: 1.0% to 7.0% and Y: 0.005% to 0.5% by wt %, and the remainder comprising Fe and other inevitable impurities, and 10 pieces or less of inclusions comprising Y and having a diameter of 30 nm to 5 μm per area of 1 mm2.

公开(公告)号：US20230060105A1

公开(公告)日：2023-02-23

申请号：US17785705

申请日：2020-12-18

Applicant: POSCO

Inventor： Oh-Yeoul Kwon ,  Woo-Sin Kim ,  Dae-Uk Kim ,  Jong-Tae Park

IPC: C21D9/46 ,  C21D8/02

Abstract: A grain-oriented electrical steel sheet according to an embodiment of the present invention has an average degree of orientation difference of 0.5 to 10° between recrystallized grains that are in contact with a groove present on the surface of the electrical steel sheet and the bottom of the groove, and other recrystallized grains.

公开(公告)号：US12084736B2

公开(公告)日：2024-09-10

申请号：US17415824

申请日：2019-12-18

Applicant: POSCO

Inventor： Oh-Yeoul Kwon ,  Woo-Sin Kim ,  Dae-Uk Kim ,  Jong-Tae Park

IPC: C21D8/12 ,  H01F1/16 ,  H01F27/245 ,  H01F41/02

CPC classification number: C21D8/1233 ,  C21D8/1272 ,  C21D8/1283 ,  H01F1/16 ,  H01F27/2455 ,  H01F41/024

Abstract: A manufacturing method of a grain-oriented electrical steel sheet according to an embodiment of the present invention includes: manufacturing a cold-rolled sheet; forming a groove in the cold-rolled sheet; removing an Fe—O oxide formed on a surface of the cold-rolled sheet; primary recrystallization annealing the cold-rolled sheet; and applying an annealing separating agent to the primary recrystallized cold-rolled sheet, and secondary recrystallization annealing it, wherein a close contacting property coefficient calculated by Formula 1 below is 0.016 to 1.13.

close contacting property coefficient (Sad)=(0.8×R)/Hhill-up  [Formula 1]

(In Formula 1, R represents the average roughness (μm) of the surface of the cold-rolled sheet after the removing of the oxide, and Hhill-up represents the average height (μm) of the hill-up present on the surface of the cold-rolled sheet after the removing of the oxide.).

公开(公告)号：US20210317545A1

公开(公告)日：2021-10-14

申请号：US17272094

申请日：2019-05-23

Applicant: POSCO

Inventor： Oh-Yeoul Kwon ,  Jong-Tae Park ,  Woo-Sin Kim ,  Chang-Ho Kim ,  Hyun-Chul Park ,  Won-Gul Lee ,  Oho-Cheal Kwon

IPC: C21D10/00 ,  C21D8/12 ,  H01F1/18 ,  C23C22/20 ,  C23C22/22 ,  C22C38/00

Abstract: An embodiment of the present invention provides a grain-oriented electrical steel sheet, including: a linear groove formed in a direction crossing a rolling direction on one surface or both surfaces of an electrical steel sheet; and a linear thermal shock portion formed in the direction crossing the rolling direction on one surface or both surfaces of the electrical steel sheet. The groove is formed in plural along the rolling direction, a distance D2 between the groove and the thermal shock portion is 0.2 to 0.5 times a distance D1 between the grooves, and a distance D3 between the thermal shock portions is 0.2 to 3.0 times the distance D1 between the grooves.

公开(公告)号：US20190309387A1

公开(公告)日：2019-10-10

申请号：US16345488

申请日：2017-10-25

Applicant: POSCO

Inventor： Chang Soo Park ,  Kyu-Seok Han ,  Hyung Don Joo ,  Jin-Wook Seo ,  Woo-Sin Kim

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00

Abstract: The grain-oriented electrical steel sheet according to one embodiment of the present invention includes, by weight, Si: 1.0 to 7.0%, B: 0.001 to 0.1%, and Ba and Y individually or in a total amount of 0.005 to 0.5%, and the remainder includes Fe and other unavoidable impurities.