公开(公告)号：US09748028B2

公开(公告)日：2017-08-29

申请号：US14414623

申请日：2013-07-25

Applicant: JFE STEEL CORPORATION

Inventor： Yukihiro Shingaki ,  Takeshi Imamura ,  Ryuichi Suehiro ,  Yasuyuki Hayakawa ,  Yuiko Wakisaka

IPC: C22C38/04 ,  H01F1/147 ,  C21D8/12 ,  C22C38/00 ,  H01F1/16 ,  C22C38/02 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C21D6/00 ,  C21D9/46 ,  C22C38/34

CPC classification number: H01F1/14775 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/12 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1283 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C22C38/34 ,  H01F1/16

Abstract: In a method for producing a grain-oriented electrical steel sheet by hot rolling a steel slab having a chemical composition including C: 0.001˜0.10 mass %, Si: 1.0˜5.0 mass %, Mn: 0.01˜0.5 mass %, Al: less than 0.0100 mass %, each of S, Se, O and N: not more than 0.0050 mass % and the remainder being Fe and inevitable impurities, subjecting the resulting hot rolled sheet to a single cold rolling or two or more cold rollings sandwiching an intermediate annealing therebetween to a final thickness, subjecting to a primary recrystallization annealing, applying an annealing separator thereto and then subjecting to a finish annealing, a zone of 550˜700° C. in a heating process of the primary recrystallization annealing is rapidly heated at an average heating rate of 40˜200° C./s, while any temperature zone of 250˜550° C. is kept at a heating rate of not more than 10° C./s for 1˜10 seconds, whereby secondary recrystallized grains are refined to obtain a grain-oriented electrical steel sheet stably realizing a low iron loss.

公开(公告)号：US10889880B2

公开(公告)日：2021-01-12

申请号：US15554051

申请日：2016-03-04

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi Imamura ,  Masanori Takenaka ,  Yuiko Wakisaka

IPC: C21D9/46 ,  C22C38/60 ,  H01F1/16 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/16 ,  C21D1/78 ,  C22C38/18 ,  C22C38/20 ,  C22C38/34 ,  C22C38/08 ,  C22C38/22 ,  C21D1/84 ,  C21D6/00

Abstract: Provided are a grain-oriented electrical steel sheet with low iron loss even when including at least one grain boundary segregation element among Sb, Sn, Mo, Cu, and P, and a method for manufacturing the same. In our method, Pr is controlled to satisfy Pr≤−0.075T+18, where T>10, 5

公开(公告)号：US10066286B2

公开(公告)日：2018-09-04

申请号：US14761707

申请日：2014-02-18

Applicant: JFE STEEL CORPORATION

Inventor： Hiroshi Matsuda ,  Hideyuki Takahashi ,  Hiroi Yamaguchi ,  Yasuyuki Hayakawa ,  Takashi Terashima ,  Yuiko Wakisaka

IPC: C23C8/38 ,  C21D8/12 ,  C21D9/46 ,  H01F1/16 ,  C23C8/02 ,  C22C38/02 ,  C23C8/26 ,  H01F1/147 ,  C21D1/773 ,  C21D1/09

CPC classification number: C23C8/38 ,  C21D1/09 ,  C21D1/773 ,  C21D8/12 ,  C21D8/1255 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/02 ,  C23C8/02 ,  C23C8/26 ,  H01F1/14775 ,  H01F1/16

Abstract: Provided is an apparatus for continuously nitriding a strip continuously being fed after cold rolling and before secondary recrystallization annealing in a production line of a grain-oriented electrical steel sheet, comprising: a nitriding zone for nitriding the strip; a cooling zone for cooling the strip; and an optional heating zone provided upstream of the nitriding zone for heating the strip, wherein, the nitriding zone is provided with glow discharge electrodes, and by plasma nitriding the strip by glow discharge with the glow discharge electrodes functioning as positive electrodes and the strip functioning as a negative electrode, inhibitor forming elements are uniformly dispersed over the full length and full width of the strip and a grain-oriented electrical steel sheet with excellent magnetic properties with no variation is obtained.

公开(公告)号：US09953752B2

公开(公告)日：2018-04-24

申请号：US14650378

申请日：2013-12-25

Applicant: JFE STEEL CORPORATION

Inventor： Yukihiro Shingaki ,  Hiroi Yamaguchi ,  Yuiko Wakisaka ,  Hiroshi Matsuda ,  Takashi Terashima

IPC: H01F1/147 ,  C21D8/12 ,  C21D9/46 ,  C21D6/00 ,  H01F1/18 ,  H01F41/02 ,  H01F41/00 ,  C23C8/26 ,  C22C38/60 ,  H01F1/16 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/22

CPC classification number: H01F1/14783 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1272 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/22 ,  C22C38/60 ,  C23C8/26 ,  H01F1/16 ,  H01F1/18 ,  H01F41/005 ,  H01F41/02

Abstract: A method for producing grain-oriented electrical steel sheets includes subjecting a steel slab to hot rolling to obtain a hot rolled sheet, the steel slab having a composition consisting of, by mass % or mass ppm, C: 0.08% or less, Si: 2.0% to 4.5% and Mn: 0.5% or less, S, Se, and O: less than 50 ppm each, sol.Al: less than 100 ppm, N: 80 ppm or less, and the balance being Fe and incidental impurities, and satisfying the relation of sol.Al (ppm)−N (ppm)×(26.98/14.00)≤30 ppm; then subjecting the hot rolled sheet to annealing and rolling to obtain a cold rolled sheet; then subjecting the cold rolled sheet to nitriding treatment, under specific condition, before, during or after primary recrystallization annealing; then applying an annealing separator on the cold rolled sheet; and subjecting the cold rolled sheet to secondary recrystallization annealing.

公开(公告)号：US09905343B2

公开(公告)日：2018-02-27

申请号：US14650073

申请日：2013-12-25

Applicant: JFE STEEL CORPORATION

Inventor： Yukihiro Shingaki ,  Yasuyuki Hayakawa ,  Hiroi Yamaguchi ,  Hiroshi Matsuda ,  Yuiko Wakisaka

IPC: H01F1/147 ,  C21D8/12 ,  C22C38/00 ,  C22C38/06 ,  C22C38/04 ,  H01F41/02 ,  C23C8/26 ,  C23C8/50 ,  C22C38/60 ,  H01F1/16 ,  C22C38/02 ,  C23C8/02 ,  C23C8/80 ,  C21D6/00

CPC classification number: H01F1/14775 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1272 ,  C21D8/1283 ,  C21D8/1294 ,  C21D2211/004 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  C23C8/02 ,  C23C8/26 ,  C23C8/50 ,  C23C8/80 ,  H01F1/16 ,  H01F41/02

Abstract: A method for producing a grain-oriented electrical steel sheets includes subjecting a steel slab to hot rolling to obtain a hot rolled sheet, the steel slab having a specific composition; then subjecting the hot rolled sheet to annealing and rolling to obtain a cold rolled sheet; then subjecting the cold rolled sheet to nitriding treatment with a nitrogen increase of 50 to 1000 ppm, during or after primary recrystallization annealing; then applying an annealing separator on the cold rolled sheet; and setting the staying time in a temperature range of 300 to 800° C. in the secondary recrystallization annealing to 5 to 150 hours.

公开(公告)号：US09708682B2

公开(公告)日：2017-07-18

申请号：US14650387

申请日：2013-12-25

Applicant: JFE STEEL CORPORATION

Inventor： Yasuyuki Hayakawa ,  Yukihiro Shingaki ,  Hiroi Yamaguchi ,  Hiroshi Matsuda ,  Yuiko Wakisaka

IPC: C21D8/12 ,  C23C8/26 ,  C23C8/50 ,  C22C38/60 ,  H01F1/16 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/22 ,  C23C8/02 ,  C23C8/80 ,  C21D1/26 ,  C21D6/00 ,  C21D9/46 ,  C22C38/06 ,  C22C38/20 ,  C22C38/26 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C23C8/04 ,  H01F1/147 ,  H01F41/02

CPC classification number: C21D8/1261 ,  C21D1/26 ,  C21D6/001 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1272 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/60 ,  C23C8/02 ,  C23C8/04 ,  C23C8/26 ,  C23C8/50 ,  C23C8/80 ,  H01F1/14783 ,  H01F1/16 ,  H01F41/02

Abstract: Grain-oriented electrical steel sheets with good magnetic properties are industrially stably produced, by using as the material, a steel slab having a predetermined composition, wherein after cold rolling and before the start of secondary recrystallization annealing, the cold rolled sheet is subjected to nitriding treatment with nitrogen content of 50 mass ppm or more and 1000 mass ppm or less, and a total content of 0.2 mass % to 15 mass % of a sulfide and/or sulfate is contained in an annealing separator, and a staying time in the temperature range of 300° C. to 800° C. in the heating stage of secondary recrystallization annealing of 5 hours or more is secured to precipitate silicon nitride (Si3N4) and MnS, and using the silicon nitride in combination with MnS as inhibiting force for normal grain growth to significantly reduce variation of magnetic properties.

公开(公告)号：US20170121785A1

公开(公告)日：2017-05-04

申请号：US15128451

申请日：2015-03-26

Applicant: JFE Steel Corporation

Inventor： Yukihiro Shingaki ,  Yuiko Wakisaka ,  Hirotaka Inoue

IPC: C21D9/46 ,  C21D1/26 ,  C23C8/26 ,  C23C8/50 ,  C22C38/60 ,  C22C38/40 ,  C22C38/34 ,  C22C38/16 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  H01F1/16 ,  C21D6/00

CPC classification number: C21D9/46 ,  C21D1/26 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1255 ,  C21D8/1272 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/34 ,  C22C38/40 ,  C22C38/60 ,  C23C8/26 ,  C23C8/50 ,  H01F1/16

Abstract: A primary recrystallization annealed sheet obtainable after an intermediate step of nitriding treatment in a grain-oriented electrical steel sheet production process using, as a material, a steel slab contains, in mass %, 0.001% to 0.10% of C, 1.0% to 5.0% of Si, 0.01% to 0.5% of Mn, 0.002% to 0.040% of one or two selected from S and Se, 0.001% to 0.050% of sol.Al, and 0.0010% to 0.020% of N, the remainder being Fe and incidental impurities. A nitrogen increase ΔN due to the nitriding treatment is 1000 ppm or less, and N intensity according to X-ray fluorescence at the steel sheet surface is 0.59 or greater. As a result, uniform sheet thickness direction dispersion of nitrides as inhibitors can be achieved with industrial reliability in a grain-oriented electrical steel sheet production process including nitriding, thereby enabling reliable production of grain-oriented electrical steel sheets having good magnetic properties.

公开(公告)号：US20150194247A1

公开(公告)日：2015-07-09

申请号：US14414623

申请日：2013-07-25

Applicant: JFE STEEL CORPORATION

Inventor： Yukihiro Shingaki ,  Takeshi Imamura ,  Ryuichi Suehiro ,  Yasuyuki Hayakawa ,  Yuiko Wakisaka

IPC: H01F1/147 ,  C21D9/46 ,  C21D6/00 ,  C22C38/34 ,  H01F1/16 ,  C22C38/12 ,  C22C38/08 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C22C38/14

CPC classification number: H01F1/14775 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/12 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1283 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C22C38/34 ,  H01F1/16

Abstract: In a method for producing a grain-oriented electrical steel sheet by hot rolling a steel slab having a chemical composition including C: 0.001˜0.10 mass %, Si: 1.0˜5.0 mass %, Mn: 0.01˜0.5 mass %, Al: less than 0.0100 mass %, each of S, Se, O and N: not more than 0.0050 mass % and the remainder being Fe and inevitable impurities, subjecting the resulting hot rolled sheet to a single cold rolling or two or more cold rollings sandwiching an intermediate annealing therebetween to a final thickness, subjecting to a primary recrystallization annealing, applying an annealing separator thereto and then subjecting to a finish annealing, a zone of 550˜700° C. in a heating process of the primary recrystallization annealing is rapidly heated at an average heating rate of 40˜200° C./s, while any temperature zone of 250˜550° C. is kept at a heating rate of not more than 10° C./s for 1˜10 seconds, whereby secondary recrystallized grains are refined to obtain a grain-oriented electrical steel sheet stably realizing a low iron loss.

Abstract translation: 在通过热轧具有C：0.001〜0.10质量％，Si：1.0〜5.0质量％，Mn：0.01〜0.5质量％的化学组成的钢坯的方法中，Al：较少 比例为0.0100质量％以下，S，Se，O和N分别为0.0050质量％以下，余量为Fe和不可避免的杂质，对所得热轧板进行单次冷轧，或者将两台以上的冷轧 在其之间退火至最终厚度，进行一次再结晶退火，向其中施加退火分离器，然后进行最终退火，在一次再结晶退火的加热过程中，在550℃至700℃的区域中快速加热 平均加热速度为40〜200℃/秒，而250〜550℃的任何温度区域的加热速度保持在10℃以下，持续1〜10秒，由此二次再结晶晶粒 被精炼以获得面向导向的电气 鳗鱼片稳定地实现了低铁损。