公开(公告)号：US20170362676A1

公开(公告)日：2017-12-21

申请号：US15539610

申请日：2015-12-21

Applicant: POSCO

Inventor： Se Il LEE ,  Hun Ju LEE

IPC: C21D9/46 ,  C22C38/14 ,  C22C38/06 ,  C21D8/12 ,  C22C38/02 ,  C22C38/00 ,  C21D6/00 ,  C22C38/60 ,  C22C38/04

CPC classification number: C21D9/46 ,  C21D6/008 ,  C21D8/12 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/60

Abstract: A method for manufacturing a non-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes performing hot rolling on a slab after heating the slab to manufacture a hot rolled sheet; performing hot rolled sheet annealing on the hot rolled sheet; performing cold rolling on a steel sheet on which the hot rolled sheet annealing is completed to manufacture a cold rolled sheet; and performing cold rolled sheet annealing on the cold rolled sheet in which a difference between a cold rolled sheet annealing temperature in the cold rolled sheet annealing and a hot rolled sheet annealing temperature in the hot rolled sheet annealing is 100° C. or lower.

公开(公告)号：US20230021013A1

公开(公告)日：2023-01-19

申请号：US17784444

申请日：2020-12-17

Applicant: POSCO

Inventor： Se Il LEE ,  Hyunwoo MUN

IPC: C22C38/08 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/04 ,  C22C38/16 ,  C21D9/46 ,  C21D8/02

Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention includes, in wt %, Si: 1.5% or less, C: 0.01% or less (excluding 0%), Mn: 0.03 to 3%, P: 0.01 to 0.2%, S: 0.001 to 0.02%, Al: 0.01% or less (excluding 0%), N: 0.005% or less (excluding 0%), Cu: 0.02 to 0.3%, 0.0001 to 0.005 wt % of Ca and Mg either alone or in total, 0.001 to 0.2 wt % of Sb and Sn either alone or in total, and a balance of Fe and inevitable impurities.

公开(公告)号：US20200087748A1

公开(公告)日：2020-03-19

申请号：US16470784

申请日：2017-12-19

Applicant: POSCO

Inventor： Se Il LEE ,  June Soo PARK ,  Jae Hoon KIM

IPC: C21D9/46 ,  C22C38/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  H01F1/147

Abstract: The non-oriented electrical steel sheet according to one embodiment of the present invention includes: by weight, 2.0% to 4.0% of Si; 0.001% to 2.0% of Al; 0.0005% to 0.009% of S; 0.02% to 1.0% of Mn, 0.0005% to 0.004% of N; 0.004% or less of C (excluding 0%); 0.005% to 0.07% of Cu; 0.0001% to 0.007% of O; individually or in a total amount of 0.05% to 0.2% of Sn or P; and the remainder comprising Fe and impurities; wherein the non-oriented electrical steel sheet is composed of a surface portion to 2 μm from the surface of the steel sheet in the thickness direction and a base portion exceeding 2 μm from the surface of the steel sheet in the thickness direction, and wherein the number of surfides having a diameter of 10 nm to 100 nm is larger than the number of the nitrides having a diameter of 10 nm to 100 nm, in the same area of base portion.

公开(公告)号：US20230060392A1

公开(公告)日：2023-03-02

申请号：US17784379

申请日：2020-12-17

Applicant: POSCO

Inventor： Se Il LEE ,  Hyunwoo MUN

IPC: C21D9/46 ,  C21D8/12 ,  C21D6/00 ,  C22C38/14 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  H01F1/147

Abstract: A double-oriented electrical steel sheet according to an example of the present invention comprises, by weight 2.0 to 4.0 wt % of Si, 0.01 to 0.04 wt % of Al, 0.0004 to 0.02 wt % of S, 0.05 to 0.3 wt % of Mn, at most 0.01 wt % (exclusive of 0 wt %) of N, at most 0.005 wt % (exclusive of 0 wt %) of C, 0.005 to 0.15 wt % of P, 0.001 to 0.005 wt % of Ti, and 0.0001 to 0.005 wt % of Mg, with the balance being Fe and other inevitable impurities, wherein the area fraction of crystal grains having an orientation within 15° from {100} is 60 to 99%, and the area fraction of crystal grains having an orientation within 15° from {100} is 1 to 30%.

公开(公告)号：US20190017136A1

公开(公告)日：2019-01-17

申请号：US16065783

申请日：2016-12-23

Applicant: POSCO

Inventor： Se Il LEE

IPC: C21D8/12 ,  C22C38/02 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16 ,  C22C38/44 ,  C22C38/42 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/14 ,  C22C38/60

Abstract: A non-oriented electrical steel sheet according to one embodiment of the present invention comprises, by weight, 1.0% to 4.0% of Si, 0.001% to 0.01% of Al, 0.002%⋅to 0.009% of S, 0.01% to 0.3% of Mn, 0.001% to 0.004% of N, 0.004% or less (0% exclusive) of C, 0.003% or less (0% exclusive) of Ti, 0.005% to 0.07% of Cu, 0.05% to 0.2% of either or both of Sn and P, and a balance amount of Fe and impurities.