公开(公告)号：US20170327922A1

公开(公告)日：2017-11-16

申请号：US15535582

申请日：2015-12-21

Applicant: POSCO

Inventor： Hak-Cheol LEE ,  Sung-Ho JANG

IPC: C21D9/46 ,  C21D6/00 ,  C22C38/12 ,  C22C38/08 ,  C22C38/04 ,  C21D8/02 ,  C22C38/00 ,  C22C38/14 ,  C22C38/16 ,  C22C38/02

CPC classification number: C21D9/46 ,  C21D6/001 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/021 ,  C21D8/0226 ,  C21D8/0247 ,  C21D8/0263 ,  C21D2201/05 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16

Abstract: Provided are high-strength steel having superior brittle crack arrestability and a production method therefor. The high-strength steel comprises 0.05-0.1 wt % of C, 0.9-1.5 wt % of Mn, 0.8-1.5 wt % of Ni, 0.005-0.1 wt % of Nb, 0.005-0.1 wt % of Ti, 0.1-0.6 wt % of Cu, 0.1-0.4 wt % of Si, at most 100 ppm of P, and at most 40 ppm of S with the remainder being Fe and other inevitable impurities, and has microstructures including one structure selected from the group consisting of a single-phase structure of ferrite, a single-phase structure of bainite, a complex-phase structure of ferrite and bainite, a complex-phase structure of ferrite and pearlite, and a complex-phase structure of ferrite, bainite, and pearlite. The high-strength steel has high yield strength and superior brittle crack arrestability.

公开(公告)号：US20170263357A1

公开(公告)日：2017-09-14

申请号：US15606074

申请日：2017-05-26

Applicant: JFE Steel Corporation

Inventor： Kunihiro Senda ,  Hirotaka Inoue ,  Seiji Okabe

IPC: H01F1/147 ,  C25F3/14 ,  C22C38/00 ,  C22C38/60 ,  H01F1/16 ,  C22C38/02 ,  C25F3/06 ,  C22C38/06 ,  C22C38/16 ,  C21D8/12 ,  C21D1/26 ,  C25F1/06 ,  B21B3/02 ,  C22C38/04

CPC classification number: H01F1/14775 ,  B21B3/02 ,  B21B2001/221 ,  C21D1/26 ,  C21D8/12 ,  C21D8/1233 ,  C21D8/1244 ,  C21D8/1283 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16 ,  C22C38/60 ,  C25F1/06 ,  C25F3/06 ,  C25F3/14 ,  H01F1/16 ,  Y10T428/24545

Abstract: A method of manufacturing a grain oriented electrical steel sheet includes subjecting a steel slab to a rolling process including cold rolling to obtain a steel sheet with a final sheet thickness, the steel slab containing by mass % C: 0.01% to 0.20%, Si: 2.0% to 5.0%, Mn: 0.03% to 0.20%, sol. Al: 0.010% to 0.05%, N: 0.0010% to 0.020%, at least one element selected from S and Se in a total of 0.005% to 0.040%, and the balance including Fe and incidental impurities; forming, by a chemical process, a linear groove extending in a direction forming an angle of 45° or less with a direction orthogonal to a rolling direction of the steel sheet; subjecting the steel sheet to decarburization annealing; applying an annealing separator thereon mainly composed of MgO; and subjecting the steel sheet to final annealing to manufacture a grain oriented electrical steel sheet.

公开(公告)号：US09748029B2

公开(公告)日：2017-08-29

申请号：US14415027

申请日：2013-07-25

Applicant: JFE STEEL CORPORATION

Inventor： Yukihiro Shingaki ,  Takeshi Imamura ,  Ryuichi Suehiro ,  Makoto Watanabe

IPC: C22C38/04 ,  H01F1/147 ,  C21D8/12 ,  C22C38/00 ,  C22C38/60 ,  H01F1/16 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  B21B1/02 ,  B21B45/00 ,  B21H7/00 ,  C21D6/00 ,  C21D9/46 ,  C22C38/34 ,  H01F41/02

CPC classification number: H01F1/14775 ,  B21B1/026 ,  B21B45/004 ,  B21H7/00 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/12 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1272 ,  C21D8/1283 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C22C38/34 ,  C22C38/60 ,  H01F1/14791 ,  H01F1/16 ,  H01F41/02

Abstract: In a method of producing a grain-oriented electrical steel sheet by hot rolling a steel slab having a chemical composition comprising C: 0.001 to 0.10 mass %, Si: 1.0 to 5.0 mass %, Mn: 0.01 to 0.5 mass %, S and/or Se: 0.005 to 0.040 mass %, sol. Al: 0.003˜0.050 mass % and N: 0.0010 to 0.020 mass %, subjecting to single cold rolling or two or more cold rollings including an intermediate annealing therebetween to a final thickness, performing primary recrystallization annealing, and thereafter applying an annealing separator to perform final annealing, a temperature range of 550° C. to 700° C. in a heating process of the primary recrystallization annealing is rapidly heated at an average heating rate of 40 to 200° C./s, while any temperature zone of from 250° C. to 550° C. is kept at a heating rate of not more than 10° C./s for 1 to 10 seconds, whereby the refining of secondary recrystallized grains is attained and grain-oriented electrical steel sheets are stably obtained with a low iron loss.

公开(公告)号：US09704626B2

公开(公告)日：2017-07-11

申请号：US14395900

申请日：2012-04-26

Applicant: Kunihiro Senda ,  Hirotaka Inoue ,  Seiji Okabe

Inventor： Kunihiro Senda ,  Hirotaka Inoue ,  Seiji Okabe

IPC: H01F1/147 ,  C21D1/26 ,  C22C38/00 ,  C22C38/04 ,  C22C38/02 ,  C21D8/12 ,  C22C38/06 ,  B21B3/02 ,  C22C38/60 ,  H01F1/16 ,  C22C38/16 ,  C25F1/06 ,  C25F3/06 ,  C25F3/14

CPC classification number: H01F1/14775 ,  B21B3/02 ,  C21D1/26 ,  C21D8/12 ,  C21D8/1233 ,  C21D8/1244 ,  C21D8/1283 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/16 ,  C22C38/34 ,  C22C38/42 ,  C22C38/60 ,  C25F1/06 ,  C25F3/06 ,  C25F3/14 ,  H01F1/16 ,  Y10T428/24545

Abstract: A grain-oriented electrical steel sheet has low iron loss properties obtained though magnetic domain refining treatment by a chemical means. The steel sheet has a linear groove extending in a direction forming an angle of 45° or less with a direction orthogonal to a rolling direction of the steel sheet, in which presence frequency of fine grains with a length in the rolling direction of 1 mm or less in a floor portion of the groove is 10% or less, including 0% indicative of the absence of fine grains, the groove is provided with a forsterite film in an amount of 0.6 g/m2 or more in terms of Mg coating amount per one surface of the steel sheet, and an average of angles (β angles) formed by axes of secondary recrystallized grains facing the rolling direction and a rolling plane of the steel sheet is 3° or less.

公开(公告)号：US09702031B2

公开(公告)日：2017-07-11

申请号：US13989271

申请日：2011-04-27

Applicant: Satoshi Akamatsu ,  Masaharu Oka

Inventor： Satoshi Akamatsu ,  Masaharu Oka

IPC: C22C38/54 ,  C21D8/04 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C21D8/02 ,  C22C38/14 ,  C22C38/16 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C21D9/48

CPC classification number: C22C38/54 ,  C21D8/0263 ,  C21D8/0436 ,  C21D8/0468 ,  C21D8/0473 ,  C21D9/46 ,  C21D9/48 ,  C21D2201/02 ,  C21D2201/05 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52

Abstract: The present invention provides a bake-hardenable high-strength cold-rolled steel sheet having excellent bake hardenability, cold aging resistance, and deep-drawability, and reduced planar anisotropy, containing chemical components in % by mass of: C: 0.0010% to 0.0040%, Si: 0.005% to 0.05%, Mn: 0.1% to 0.8%, P: 0.01% to 0.07%, S: 0.001% to 0.01%, Al: 0.01% to 0.08%, N: 0.0010% to 0.0050%, Nb: 0.002% to 0.020%, and Mo: 0.005% to 0.050%, a value of [Mn %]/[P %] being in the range of 1.6 to 45, where [Mn %] is an amount of Mn and [P %] is an amount of P, an amount of C in solid solution obtained from [C %]−(12/93)×[Nb %] being in the range of 0.0005% to 0.0025%, where [C %] is an amount of C and [Nb %] is an amount of Nb, with a balance including Fe and inevitable impurities, wherein the bake-hardenable high-strength cold-rolled steel sheet satisfies the following Equation (1), where X(222), X(110), and X(200) represent ratios of integrated intensity of X-ray diffraction of {222} plane, {110} plane, and {200} plane, respectively, being parallel to a plane located at a depth of ¼ plate thickness measured from the surface of the steel sheet, and the bake-hardenable high-strength cold-rolled steel sheet has tensile strength in the range of 300 MPa to 450 MPa.

公开(公告)号：US09679687B2

公开(公告)日：2017-06-13

申请号：US14524038

申请日：2014-10-27

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Tooru Inaguma ,  Miho Tomita ,  Youji Mizuhara ,  Hiroaki Sakamoto

IPC: C22C38/02 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/24 ,  C22C38/18 ,  H01F1/16 ,  H01F1/053 ,  H01F1/147 ,  B32B15/01 ,  C21D8/12 ,  C22C38/00 ,  C22C38/04 ,  C22C38/08 ,  C22C38/16 ,  C23C10/28 ,  C23C14/58 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C14/16

CPC classification number: H01F1/14775 ,  B32B15/011 ,  B32B15/012 ,  B32B15/013 ,  C21D8/1222 ,  C21D8/1233 ,  C21D2201/05 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2221/00 ,  C21D2221/10 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/16 ,  C22C38/18 ,  C22C2202/02 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C10/28 ,  C23C14/16 ,  C23C14/5893 ,  H01F1/16 ,  Y10T428/12951

Abstract: On at least one surface of a base metal plate (1) of an α-γ transforming Fe or Fe alloy, a metal layer (2) containing ferrite former is formed. Next, the base metal plate (1) and the metal layer (2) are heated to an A3 point of the Fe or the Fe alloy, whereby the ferrite former are diffused into the base metal plate (1) to form an alloy region (1b) in a ferrite phase in which an accumulation degree of {200} planes is 25% or more and an accumulation degree of {222} planes is 40% or less. Next, the base metal plate (1) is heated to a temperature higher than the A3 point of the Fe or the Fe alloy, whereby the accumulation degree of the {200} planes is increased and the accumulation degree of the {222} planes is decreased while the alloy region (11b) is maintained in the ferrite phase.

公开(公告)号：US20170152591A1

公开(公告)日：2017-06-01

申请号：US15429819

申请日：2017-02-10

Applicant: DOWA THERMOTECH CO., LTD. ,  HONDA MOTOR CO., LTD.

Inventor： Yuichiro Shimizu ,  Atsushi Kobayashi ,  Susumu Maeda ,  Masao Kanayama ,  Kiyotaka Akimoto

IPC: C23C8/26 ,  C22C38/22 ,  C22C38/00 ,  C22C38/04 ,  C22C38/02 ,  C22C38/44 ,  C22C38/06

CPC classification number: C23C8/26 ,  C21D1/06 ,  C21D1/74 ,  C21D1/76 ,  C21D9/32 ,  C21D2201/05 ,  C21D2221/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/44

Abstract: A manufacturing method of a nitrided steel member and the nitrided steel member include: performing a nitriding treatment on a steel member made of a carbon steel or an alloy steel in an atmosphere of a nitriding treatment gas in which when the total pressure is set to 1, a partial pressure ratio of NH3 gas is set to 0.08 to 0.34, a partial pressure ratio of H2 gas is set to 0.54 to 0.82, and a partial pressure ratio of N2 gas is set to 0.09 to 0.18, at a flow speed of the nitriding treatment gas set to 1 m/s or more, at 500 to 620° C.; and thereby, forming an iron nitride compound layer having a thickness of 2 to 17 μm on a surface of the steel member.

公开(公告)号：US09659693B2

公开(公告)日：2017-05-23

申请号：US14276117

申请日：2014-05-13

Applicant: Nippon Steel & Sumitomo Metal Corporation

Inventor： Tatsuhiko Sakai ,  Koji Hirano ,  Satoshi Arai ,  Yoshiyuki Ushigami

IPC: H01F1/147 ,  C21D8/12 ,  C21D10/00 ,  C22C38/34 ,  H01F1/16 ,  C21D8/02 ,  H01F1/01 ,  C21D9/46

CPC classification number: H01F1/14775 ,  C21D8/0205 ,  C21D8/0278 ,  C21D8/12 ,  C21D8/1233 ,  C21D8/1277 ,  C21D9/46 ,  C21D10/00 ,  C21D2201/05 ,  C22C38/34 ,  H01F1/01 ,  H01F1/16

Abstract: A silicon steel sheet (1) containing Si is cold-rolled. Next, a decarburization annealing (3) of the silicon steel sheet (1) is performed so as to cause a primary recrystallization. Next, the silicon steel sheet (1) is coiled so as to obtain a steel sheet coil (31). Next, an annealing (6) of the steel sheet coil (31) is performed through batch processing so as to cause a secondary recrystallization. Next, the steel sheet coil (31) is uncoiled and flattened. Between the cold-rolling and the obtaining the steel sheet coil (31), a laser beam is irradiated a plurality of times at predetermined intervals on a surface of the silicon steel sheet (1) from one end to the other end of the silicon steel sheet (1) along a sheet width direction (2). When the secondary recrystallization is caused, grain boundaries passing from a front surface to a rear surface of the silicon steel sheet (1) along paths of the laser beams are generated.

公开(公告)号：US09598760B2

公开(公告)日：2017-03-21

申请号：US14001444

申请日：2012-02-22

Applicant: Yuichiro Shimizu ,  Atsushi Kobayashi ,  Susumu Maeda ,  Masao Kanayama ,  Kiyotaka Akimoto

Inventor： Yuichiro Shimizu ,  Atsushi Kobayashi ,  Susumu Maeda ,  Masao Kanayama ,  Kiyotaka Akimoto

IPC: C23C8/26 ,  C21D1/06 ,  C21D1/74 ,  C21D1/76 ,  C21D9/32 ,  C22C38/22 ,  C22C38/44

CPC classification number: C23C8/26 ,  C21D1/06 ,  C21D1/74 ,  C21D1/76 ,  C21D9/32 ,  C21D2201/05 ,  C21D2221/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/44

Abstract: The present invention provides a nitrided steel member and manufacturing method thereof. the nitrided steel member including: an iron nitride compound layer formed on a surface of a steel member made of carbon steel for machine structural use or alloy steel for machine structural use, in which with regard to X-ray diffraction peak intensity IFe4N (111) of the (111) crystal plane of Fe4N and X-ray diffraction peak intensity IFe3N (111) of the (111) crystal plane of Fe3N obtained by measuring a surface of the nitrided steel member by X-ray diffraction, an intensity ratio represented by IFe4N(111)/{IFe4N (111)+IFe3N (111)} is 0.5 or more, and a thickness of the iron nitride compound layer is 2 to 17 μm.

公开(公告)号：US20170067132A1

公开(公告)日：2017-03-09

申请号：US15123119

申请日：2015-03-09

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Kengo TAKEDA ,  Toshimasa TOMOKIYO ,  Yasushi TSUKANO ,  Takashi ARAMAKI

IPC: C21D9/46 ,  C22C38/32 ,  C22C38/16 ,  C22C38/14 ,  C21D8/02 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/60 ,  C22C38/12

CPC classification number: C21D9/46 ,  C21D1/32 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0473 ,  C21D2201/05 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/32 ,  C22C38/60

Abstract: A middle/high carbon steel sheet according to an aspect of the present invention is a steel sheet, in which composition thereof contains, by mass %, C: 0.10% to 1.50%, Si: 0.01% to 1.00%, Mn: 0.01% to 3.00%, P: 0.0001% to 0.1000%, and S: 0.0001% to 0.1000%, and a remainder consisting of Fe and impurities, in which the steel sheet has a structure in which a total volume percentage of a martensite, a bainite, a pearlite, and a residual austenite is equal to or lower than 5.0%, and a remainder thereof is a ferrite and carbides, in which a spheroidizing ratio of carbide particles is 70% to 99%, and in which a proportion of a number of the carbide particles including a crystal interface at which an orientation difference is equal to or greater than 5° in the carbide particles is equal to or lower than 20% of a total number of the carbide particles.

Abstract translation: 本发明的中高碳钢板是以质量％计含有C：0.10〜1.50％，Si：0.01〜1.00％，Mn：0.01％的钢板， 至3.00％，P：0.0001％至0.1000％，S：0.0001％至0.1000％，余量由Fe和杂质组成，其中钢板具有马氏体，贝氏体的总体积百分比 ，珠光体和残留奥氏体等于或低于5.0％，其余部分是碳化物粒子的球化比为70％〜99％的铁素体和碳化物，其中， 包含在碳化物粒子中取向差为5°以上的结晶界面的碳化物粒子等于或低于碳化物粒子总数的20％。