公开(公告)号：US20240105369A1

公开(公告)日：2024-03-28

申请号：US17768570

申请日：2020-10-27

Applicant: JFE Steel Corporation

Inventor： Makoto Watanabe ,  Masahiro Suemune ,  Takeshi Imamura

IPC: H01F1/147 ,  C21D1/74 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/34 ,  C22C38/40 ,  C22C38/60 ,  C23G1/08

CPC classification number: H01F1/14783 ,  C21D1/74 ,  C21D6/001 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/34 ,  C22C38/40 ,  C22C38/60 ,  C23G1/08 ,  C22C2202/02

Abstract: In a production of a grain-oriented electrical steel sheet comprising hot rolling a raw steel material, cold rolling, decarburization annealing, applying an annealing separator composed mainly of MgO, finish annealing and magnetic domain subdividing, the annealing separator including certain compounds, and the finish annealing conducted by holding the steel sheet at a temperature of 800 to 950° C. for 10 to 100 hours and passing a dry gas containing not less than 1 vol % of H2 and having a dew point of not higher than 10° C. to reach a furnace pressure of not less than 3.5 mmH2O from not lower than 1050° C. to a purification treatment temperature, so that a pickling weight loss of undercoat film by pickling with HCl is not more than 1.8 g/m2 and the total concentration of Sn, Sb, Mo, and W on a boundary face between the film and iron matrix is 0.01 to 0.15 mass %.

公开(公告)号：US11525174B2

公开(公告)日：2022-12-13

申请号：US16957723

申请日：2018-12-27

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi Imamura ,  Makoto Watanabe

IPC: C22C38/02 ,  C21D8/12 ,  C22C38/00 ,  C22C38/04 ,  C22C38/12

Abstract: Disclosed is a grain-oriented electrical steel sheet that has excellent high-frequency iron loss properties and blanking workability. The steel sheet includes: steel components including, by mass %, Si: 1.5-8.0%, Mn: 0.02-1.0%, and at least one selected from Sn: 0.010-0.400%, Sb: 0.010-0.400%, Mo: 0.010-0.200%, and P: 0.010-0.200%; and crystal grains including coarse secondary recrystallized grains having an average grain size of 5 mm or more and fine grains having a grain size of 0.1-2.0 mm, wherein at least some of the coarse secondary recrystallized grains penetrate the steel sheet in a thickness direction and are respectively exposed on front and back surfaces of the steel sheet such that projection planes of the exposed surfaces of these coarse secondary recrystallized grains on the front and back surfaces form an overlapping region, and the fine grains are present at a number density per unit area of 0.6-40 pieces/cm2.

公开(公告)号：US20210207252A1

公开(公告)日：2021-07-08

申请号：US16090631

申请日：2017-02-07

Applicant: JFE Steel Corporation

Inventor： Seiji Okabe ,  Takeshi Imamura ,  Katsumi Yamada

IPC: C22C45/02

Abstract: There is provided an amorphous alloy thin strip having a chemical composition represented by a chemical formula: FexBySiz (x: 78-83 at %, y: 8-15 at % and z: 6-13 at %) capable of stably attaining a low iron loss even when shaped into a wound core, wherein a generation density of air pockets on a face contacting with a cooling roll is not more than 8 per 1 mm2 and an arithmetic mean height Sa on portions other than the air pockets is not more than 0.3 μm.

公开(公告)号：US10519534B2

公开(公告)日：2019-12-31

申请号：US14907868

申请日：2014-07-28

Applicant: JFE Steel Corporation

Inventor： Seiji Okabe ,  Nobuo Shiga ,  Takeshi Imamura

IPC: C22C45/02 ,  H01F1/153 ,  H01F27/25

Abstract: A iron-based amorphous alloy thin strip having a chemical composition represented by a chemical formula of FexBySiz (wherein x is 78-83 at %, y is 8-15 at % and z is 6-13 at %), wherein the number of air pockets at a surface contacting with a cooling roll is not more than 8 pockets/mm2 and an average length in a circumferential direction of the roll is not more than 0.5 mm.

公开(公告)号：US10192662B2

公开(公告)日：2019-01-29

申请号：US14767718

申请日：2014-02-12

Applicant: JFE STEEL CORPORATION

Inventor： Makoto Watanabe ,  Takeshi Imamura ,  Ryuichi Suehiro ,  Toshito Takamiya

IPC: C21D8/12 ,  H01F1/147 ,  C22C38/04 ,  C22C38/60 ,  H01F1/16 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/12 ,  C22C38/34 ,  C21D3/04 ,  C21D6/00 ,  C21D9/46 ,  C22C38/16 ,  C22C38/40 ,  C23C8/26 ,  H01F41/02

Abstract: In a method for producing a grain-oriented electrical steel sheet by comprising a series of steps of hot rolling a raw steel material comprising C: 0.002-0.10 mass %, Si: 2.0-8.0 mass %, and Mn: 0.005-1.0 mass %, subjecting the steel sheet to a hot band annealing as required, cold rolling to obtain a cold rolled sheet having a final sheet thickness, subjecting the steel sheet to primary recrystallization annealing combined with decarburization annealing, applying an annealing separator to the steel sheet surface and then subjecting to final annealing, rapid heating is performed at a rate of not less than 50° C./s in a region of 200-700° C. in the heating process of the primary recrystallization annealing, and the steel sheet is held at any temperature of 250-600° C. in the above region for 1-10 seconds, while a soaking process of the primary recrystallization annealing is controlled to a temperature range of 750-900° C., a time of 90-180 seconds and PH2O/PH2 in an atmosphere of 0.25-0.40, whereby a grain-oriented electrical steel sheet being low in the iron loss and small in the deviation of the iron loss value is obtained.

公开(公告)号：US20160168674A1

公开(公告)日：2016-06-16

申请号：US14907868

申请日：2014-07-28

Applicant: JFE Steel Corporation

Inventor： Seiji Okabe ,  Nobuo Shiga ,  Takeshi Imamura

IPC: C22C45/02 ,  H01F27/25

Abstract: A iron-based amorphous alloy thin strip having a chemical composition represented by a chemical formula of FexBySiz (wherein x is 78-83 at %, y is 8-15 at % and z is 6-13 at %), wherein the number of air pockets at a surface contacting with a cooling roll is not more than 8 pockets/mm2 and an average length in a circumferential direction of the roll is not more than 0.5 mm.

Abstract translation: 具有由化学式FexBySiz表示的化学组成的铁基非晶态合金薄带（其中x为78-83原子％，y为8-15原子％，z为6-13原子％），其中， 在与冷却辊接触的表面处的气穴不大于8个/ mm 2，辊的圆周方向的平均长度不大于0.5mm。

公开(公告)号：US20160012949A1

公开(公告)日：2016-01-14

申请号：US14770913

申请日：2014-02-24

Applicant: JFE STEEL CORPORATION

Inventor： Masanori Uesaka ,  Takeshi Imamura ,  Ryuichi Suehiro ,  Takayuki Fukunaga ,  Toshito Takamiya

IPC: H01F1/147 ,  C21D3/04 ,  C21D1/26 ,  C21D9/46 ,  C22C38/02 ,  C22C38/60 ,  C22C38/04 ,  C22C38/16 ,  C22C38/00 ,  C22C38/06 ,  C22C38/12 ,  C22C38/40 ,  C22C38/34 ,  H01F1/16 ,  H01F41/02 ,  C21D8/12

CPC classification number: H01F1/14775 ,  C21D1/26 ,  C21D3/04 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/16 ,  C22C38/34 ,  C22C38/40 ,  C22C38/60 ,  H01F1/16 ,  H01F41/02

Abstract: In a method for producing a grain-oriented electrical steel sheet by hot rolling a raw steel material containing C: 0.002˜0.10 mass %, Si: 2.0˜8.0 mass % and Mn: 0.005˜1.0 mass % to obtain a hot rolled sheet, subjecting the hot rolled sheet to a hot band annealing as required and further to one cold rolling or two or more cold rollings including an intermediate annealing therebetween to obtain a cold rolled sheet having a final sheet thickness, subjecting the cold rolled sheet to a primary recrystallization annealing combined with decarburization annealing, applying an annealing separator to the steel sheet surface and then subjecting to a final annealing, when rapid heating is performed at a rate of not less than 50° C./s in a range of 100˜700° C. in the heating process of the primary recrystallization annealing, the steel sheet is subjected to a holding treatment at any temperature of 250˜600° C. for 0.5˜10 seconds 2 to 6 times to thereby obtain a grain-oriented electrical steel sheet being low in the iron loss and small in the deviation of the iron loss value.

Abstract translation: 在通过热轧含有C：0.002〜0.10质量％，Si：2.0〜8.0质量％，Mn：0.005〜1.0质量％的原料钢来制造方向性电磁钢板的方法中，得到热轧板， 对热轧板根据需要进行热带退火，并进一步进行一次冷轧或两次以上的冷轧，包括中间退火，得到最终板厚的冷轧板，对冷轧板进行一次再结晶 退火与脱碳退火相结合，在钢板表面施加退火分离剂，然后进行最终退火，当以不低于50℃/秒的速度进行快速加热时，在100〜700℃的范围内 在一次再结晶退火的加热过程中，将钢板在250〜600℃的任何温度下进行保持处理0.5〜10秒2〜6次，得到晶粒取向电 铁损低铁损，铁损偏差偏小。

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。

公开(公告)号：US20150013850A1

公开(公告)日：2015-01-15

申请号：US14373973

申请日：2013-01-22

Applicant: JFE Steel Corporation

Inventor： Takeshi Imamura ,  Minoru Takashima ,  Tatsuhiko Hiratani

IPC: H01F1/147 ,  C22C38/34 ,  C22C38/44 ,  C22C38/42 ,  C22C38/60 ,  C22C38/00 ,  C22C38/20 ,  C22C38/16 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/22

CPC classification number: C22C38/22 ,  C21D8/12 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/002 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/20 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/60 ,  H01F1/14775 ,  H01F1/14791 ,  H01F1/16

Abstract: An electrical steel sheet has a composition including C: less than 0.010 mass %, Si: 1.5˜10 mass % and the balance being Fe and incidental impurities, wherein a main orientation in a texture of a steel sheet is //ND and an intensity ratio relative to randomly oriented specimen of the main orientation is not less than 5 and, preferably an intensity ratio relative to randomly oriented specimen of {111} orientation is not less than 10, an intensity ratio relative to randomly oriented specimen of {310} orientation is not more than 3 and Si concentration has a gradient that it is high at a side of a surface layer and low at a central portion in the thickness direction and a maximum value of the Si concentration is not less than 5.5 mass % and a difference between maximum and minimum values is not less than 0.5 mass %.

Abstract translation: 电工钢板的组成包括C：小于0.010质量％，Si：1.5〜10质量％，余量为Fe和附带杂质，其中，钢板质地的主取向为<111> // ND 并且相对于主取向的随机取向试样的强度比不小于5，优选相对于{111} <112>取向的随机取向试样的强度比不小于10，相对于随机取向的强度比 {310} <001>取向的试样不大于3，Si浓度具有在表面层一侧高的厚度，在厚度方向的中心部位为低的梯度，Si浓度的最大值为 不小于5.5质量％，最大值与最小值之差为0.5质量％以上。

公开(公告)号：US20240271254A1

公开(公告)日：2024-08-15

申请号：US18564197

申请日：2022-05-26

Applicant: JFE Steel Corporation

Inventor： Masanori Takenaka ,  Takeshi Imamura ,  Takaaki Tanaka ,  Yukihiro Matsubara

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

CPC classification number: C22C38/02 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60

Abstract: A method for producing a grain-oriented electrical steel sheet includes steps of heating a steel slab having a specified ingredient composition to a temperature of 1300 or lower; subjecting the slab to hot rolling and then one cold rolling or two or more cold rolling with intermediate annealing between each rolling to obtain a cold-rolled sheet with a final sheet thickness; performing primary recrystallization annealing which also serves as decarburization annealing; applying an annealing separator; and subjecting the steel sheet to finishing annealing. In this method, after soaking in the annealing step preceding the cold rolling for achieving the final sheet thickness, the steel sheet is cooled from 800 to 400° C. at an average cooling rate of 15° C./s or more and subsequently subjected to low-temperature heat treatment comprising holding the sheet at a temperature in a range of 60 to 100° C. for 30 to 600 seconds.