公开(公告)号：US20180030558A1

公开(公告)日：2018-02-01

申请号：US15552755

申请日：2015-12-11

Applicant: JFE STEEL CORPORATION

Inventor： Tomoyuki OKUBO ,  Kohei KURIHARA ,  Yoshihiko ODA ,  Hiroaki NAKAJIMA

IPC: C21D8/12 ,  H01F1/16 ,  C22C38/58 ,  C22C38/60 ,  C21D9/46 ,  C22C38/00

CPC classification number: C21D8/12 ,  C21D1/34 ,  C21D1/42 ,  C21D8/1272 ,  C21D9/46 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/58 ,  C22C38/60 ,  H01F1/14775 ,  H01F1/16

Abstract: In the production of a non-oriented electrical stress sheet by hot rolling a steel slab containing, by mass %, C: not more than 0.005%, Si: not more than 8.0%, Mn: 0.03-3.0%, P: not more than 0.2%, S: not more than 0.005%, Al: not more than 3.0%, N: not more than 0.005%, Ni: not more than 3%, Cr: not more than 5%, Ti: not more than 0.005%, Nb: not more than 0.003%, As: not more than 0.005% and O: not more than 0.005%, subjecting to one cold rolling or two or more cold rollings interposing an intermediate annealing therebetween after conducting a hot band annealing or without conducting a hot band annealing and subjecting to a finish annealing, an average heating rate from 600° C. to 700° C. during the heating process in the finish annealing is set to not less than 50° C./sec.

公开(公告)号：US20170211161A1

公开(公告)日：2017-07-27

申请号：US15500435

申请日：2015-08-13

Applicant: JFE STEEL CORPORATION

Inventor： Tadashi NAKANISHI ,  Hiroaki NAKAJIMA ,  Tomoyuki OKUBO ,  Yoshihiko ODA

IPC: C21D8/12 ,  C22C38/60 ,  C22C38/06 ,  H01F1/147 ,  C22C38/00 ,  C22C38/16 ,  C22C38/02 ,  C21D6/00 ,  C22C38/04

Abstract: A non-oriented electrical steel sheet with excellent recyclability whose magnetic property is prevented from becoming unstable in the case of reducing the Al content in order to reuse the non-oriented electrical steel sheet as iron scrap is provided. The non-oriented electrical steel sheet has a chemical composition containing, in mass %: C: 0.0050% or less; Si: 1.0% or more and 4.0% or less; Mn: 0.10% or more and 3.0% or less; Sol. Al: less than 0.0050%; P: more than 0.01% and 0.20% or less; S: 0.0050% or less; N: 0.0050% or less; Cu: 0.02% or more and less than 0.10%; and Ca: 0.0005% or more and 0.0100% or less, with a balance being Fe and incidental impurities.

公开(公告)号：US20180202021A1

公开(公告)日：2018-07-19

申请号：US15743776

申请日：2016-08-25

Applicant: JFE STEEL CORPORATION

Inventor： Yoshihiko ODA ,  Tadashi NAKANISHI ,  Tomoyuki OKUBO ,  Yoshiaki ZAIZEN ,  Hiroaki NAKAJIMA

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

CPC classification number: C21D9/46 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1272 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C2202/02 ,  H01F1/14775 ,  H01F1/16 ,  H02K1/02

Abstract: Iron loss is reduced by increasing magnetic flux density. A non-oriented electrical steel sheet has a chemical composition containing, by mass %, C: 0.0050% or less, Si: 1.50% or more and 4.00% or less, Al: 0.500% or less, Mn: 0.10% or more and 5.00% or less, S: 0.0200% or less, P: 0.200% or less, N: 0.0050% or less, and O: 0.0200% or less, with the balance consisting of Fe and inevitable impurities, in which the steel sheet has an Ar3 transformation temperature of 700° C. or higher, a grain size of 80 μm or more and 200 μm or less, a Vickers hardness of 140 HV or more and 230 HV or less.

公开(公告)号：US20230257860A1

公开(公告)日：2023-08-17

申请号：US18296997

申请日：2023-04-07

Applicant: JFE STEEL CORPORATION

Inventor： Masanori UESAKA ,  Yoshiaki ZAIZEN ,  Tomoyuki OKUBO ,  Hiroaki NAKAJIMA ,  Yoshihiko ODA

IPC: C22C38/10 ,  C21D8/12 ,  C21D9/46 ,  C21D9/68 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08

CPC classification number: C22C38/105 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1272 ,  C21D9/46 ,  C21D9/68 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/005 ,  C22C38/06 ,  C22C38/008 ,  C22C38/08

Abstract: Provided is a method of easily producing a non-oriented electrical steel sheet that contains substantially no Al and contains large amounts of Si and Mn and has low iron loss, comprising hot rolling a slab having a specified chemical composition to obtain a hot-rolled sheet; coiling the hot-rolled sheet; cold rolling the hot-rolled sheet once or twice with intermediate annealing being performed therebetween, to obtain a cold-rolled sheet; and subjecting the cold-rolled sheet to final annealing, wherein the hot-rolled sheet after the hot rolling is cooled at an average cooling rate from 800° C. to 650° C. of 30° C./s or more, and thereafter the coiling is performed at 650° C. or less.

公开(公告)号：US20210332464A1

公开(公告)日：2021-10-28

申请号：US17055601

申请日：2019-05-20

Applicant: JFE STEEL CORPORATION

Inventor： Masanori UESAKA ,  Yoshiaki ZAIZEN ,  Tomoyuki OKUBO ,  Hiroaki NAKAJIMA ,  Yoshihiko ODA

IPC: C22C38/10 ,  C21D8/12 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  C22C38/08 ,  C21D9/68

Abstract: Provided is a non-oriented electrical steel sheet that contains substantially no Al and contains large amounts of Si and Mn and has low iron loss, comprising a chemical composition containing C: 0.0050% or less, Si: 2.0% or more and 6.0% or less, Mn: 1.0% or more and 3.0% or less, P: 0.20% or less, S: 0.0050% or less, N: 0.0050% or less, Al: 0.0050% or less, and one or more selected from B: 0.0001% or more and 0.0050% or less, Nb: 0.0001% or more and 0.0050% or less, and V: 0.0005% or more and 0.0500% or less, with a balance consisting of Fe and inevitable impurities, wherein a number density of Si—Mn nitrides with an average diameter of 50 nm or more and 500 nm or less is 1 or less per μm3.

公开(公告)号：US20190024205A9

公开(公告)日：2019-01-24

申请号：US15743776

申请日：2016-08-25

Applicant: JFE STEEL CORPORATION

Inventor： Yoshihiko ODA ,  Tadashi NAKANISHI ,  Tomoyuki OKUBO ,  Yoshiaki ZAIZEN ,  Hiroaki NAKAJIMA

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

Abstract: Iron loss is reduced by increasing magnetic flux density. A non-oriented electrical steel sheet has a chemical composition containing, by mass %, C: 0.0050% or less, Si: 1.50% or more and 4.00% or less, Al: 0.500% or less, Mn: 0.10% or more and 5.00% or less, S: 0.0200% or less, P: 0.200% or less, N: 0.0050% or less, and O: 0.0200% or less, with the balance consisting of Fe and inevitable impurities, in which the steel sheet has an Ar3 transformation temperature of 700° C. or higher, a grain size of 80 μm or more and 200 μm or less, a Vickers hardness of 140 HV or more and 230 HV or less.