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1. 发明公开

EP4450660A1 NICKEL-CONTAINING STEEL WELD JOINT FOR LOW TEMPERATURE USE 失效
公开(公告)号：EP4450660A1
公开(公告)日：2024-10-23
申请号：EP21968226.7
申请日：2021-12-17
申请人： NIPPON STEEL CORPORATION
发明人： NAMEGAWA, Tetsuya , HOSHINO, Manabu , OMIYA, Shinichi
IPC分类号： C22C38/00 , B23K35/30 , C22C19/05 , C22C38/54 , C22C38/60
CPC分类号： B23K35/30 , C22C19/03 , C22C19/05 , C22C38/00 , C22C38/54 , C22C38/60
摘要： A nickel-containing steel welded joint for low temperature use has: a base metal portion; a welded heat-affected zone; and a weld metal, the base metal portion includes, as a chemical composition, predetermined chemical components, the average circle equivalent diameter of prior austenite of the base metal portion is 3.0 µm or more and 20.0 µm or less, the yield stress of the base metal portion at 20°C is 460 MPa or more and 710 MPa or less, the weld metal includes, as a chemical composition, predetermined chemical components, and the proportion of a body-centered cubic structure in the structure of the weld metal is 10% or less.

2. 发明公开

EP4450659A1 STAINLESS STEEL POWDER, STAINLESS STEEL MEMBER, AND STAINLESS STEEL MEMBER MANUFACTURING METHOD 失效
公开(公告)号：EP4450659A1
公开(公告)日：2024-10-23
申请号：EP22927314.9
申请日：2022-12-01
申请人： JFE Steel Corporation
发明人： MIZUTANI Akito , TAKASHITA Takuya , NAKAMURA Tetsuyuki , GAO Fagang , HORIUCHI Jun
IPC分类号： C22C33/02 , C22C38/00 , C22C38/58 , C22C38/60 , B33Y80/00 , B33Y70/00 , B22F10/28 , B22F1/00
CPC分类号： B22F1/00 , B22F10/28 , B33Y70/00 , B33Y80/00 , C22C33/02 , C22C38/00 , C22C38/58 , C22C38/60 , Y02P10/25
摘要： There is provided a stainless steel powder which can manufacture a stainless steel member having excellent high-temperature proof stress and excellent oxidation resistance.
The stainless steel powder has a chemical composition including, in % by mass: C: 0.20% or less; Si: 2.0% or less; Mn: 2.0% or less; P: 0.040% or less; S: 0.010% or less; Cr: 18.0 to 35.0%; Ni: 1.0% or less; Cu: 0.50 to 4.0%; Nb: 0.7 to 3.0%; Mo: 6.0% or less; W: 6.0% or less; N: 0.030% or less; and O: 0.10% or less, the balance being Fe and incidental impurities, and the composition satisfying the following inequality (1): Mo+W≥2.0 where Mo and W represent the contents (% by mass) of Mo and W, respectively.

3. 发明公开

EP4446464A1 PRE-TREATMENT LIQUID AND METHOD FOR MANUFACTURING ELECTROMAGNETIC STEEL SHEET PROVIDED WITH INSULATING FILM 审中-实审
公开(公告)号：EP4446464A1
公开(公告)日：2024-10-16
申请号：EP22922000.9
申请日：2022-09-28
申请人： JFE Steel Corporation
发明人： TERASHIMA, Takashi , KOKUFU, Karin
IPC分类号： C23C22/78 , C21D9/46 , C22C38/00 , C22C38/60 , C23C22/00 , H01F1/147
CPC分类号： C21D9/46 , C22C38/00 , C22C38/60 , C23C22/00 , C23C22/78 , H01F1/147
摘要： The present invention obtains an electrical steel sheet provided with an insulating coating which is excellent in appearance, provides a high applied tension and a low iron loss, has excellent insulation properties. Provided is a pre-treatment liquid to be used on an electrical steel sheet having a forsterite coating on a surface thereof before applying an insulating coating treatment liquid containing a phosphate, when a phosphate concentration of the pre-treatment liquid is defined as A mass% in terms of H3PO4, a refractive index R of the pre-treatment liquid satisfies Formula (1): 9.0 × 10-4 × A + 1.3340 ≤ R ... (1).

4. 发明公开

EP4442844A1 STEEL SHEET 审中-实审
公开(公告)号：EP4442844A1
公开(公告)日：2024-10-09
申请号：EP22900859.4
申请日：2022-08-23
申请人： NIPPON STEEL CORPORATION
发明人： HIRONAKA, Satoshi , ITO, Yasuhiro , NAGANO, Mai
IPC分类号： C21D9/46 , C22C38/00 , C22C38/60
CPC分类号： C22C38/00 , C21D9/46 , C22C38/60
摘要： Provided is a steel sheet having a predetermined chemical composition, wherein an index A represented by 10[C]+0.3[Mn]-0.2[Si]-0.6[Al]-0.05[Cr]-0.2[Mo] is 1.10% or less, and a microstructure comprising, by area%, ferrite: 70 to 95%, and a hard phase: 5 to 30%, wherein a maximum connected length of the hard phase in a rolling direction at a sheet thickness 1/2 position is 80 µm or less, and a maximum connected length of the hard phase in a rolling direction at a sheet thickness 1/4 position is 40 µm or less.

5. 发明公开

EP4427857A1 NON-ORIENTED ELECTROMAGNETIC STEEL SHEET AND METHOD FOR MANUFACTURING SAME 审中-实审
公开(公告)号：EP4427857A1
公开(公告)日：2024-09-11
申请号：EP22907415.8
申请日：2022-12-12
申请人： JFE Steel Corporation
发明人： TANAKA, Takaaki , OKUBO, Tomoyuki
IPC分类号： B21B3/02 , C21D8/12 , C21D9/46 , C22C38/00 , C22C38/06 , C22C38/60 , B21B1/22 , H01F1/147
CPC分类号： B21B1/22 , B21B3/02 , H01F1/147 , C21D8/12 , C21D9/46 , C22C38/00 , C22C38/06 , C22C38/60 , Y02P10/20
摘要： A non-oriented electrical steel sheet according to the present invention includes, by mass%, C: 0.010% or less, Si: 1.0% or more and 5.0% or less, Mn: 0.05% or more and 5.0% or less, P: 0.1% or less, S: 0.01% or less, Al: 3.0% or less, N: 0.005% or less, and the balance being Fe and inevitable impurities, wherein an average crystal grain size is 60 µm or more and 200 µm or less, and a sum SA of area ratios of crystal grains with oriented in a rolling direction or a direction perpendicular to the rolling direction and a sum SB of area ratios of crystal grains with oriented in the rolling direction or the direction perpendicular to the rolling direction satisfy SA - SB ≥ 0.

6. 发明授权

EP3653753B1 GRAIN-ORIENTED ELECTRICAL STEEL SHEET 有权
公开(公告)号：EP3653753B1
公开(公告)日：2024-09-04
申请号：EP18832179.8
申请日：2018-07-13
IPC分类号： H01F1/18 , C22C38/00 , C23C22/00 , C21D8/12 , C22C38/16 , C22C38/08 , C22C38/04 , C22C38/02 , H01F1/147 , C22C38/60 , C21D9/46 , C23C22/33 , C23C22/74
CPC分类号： C21D8/12 , C22C38/60 , C22C38/02 , C22C38/04 , C22C38/16 , C22C38/08 , H01F1/18 , H01F1/14783 , C23C22/33 , C23C22/74 , C22C38/002

7. 发明公开

EP4417716A1 NON-ORIENTED ELECTROMAGNETIC STEEL SHEET, IRON CORE AND MOTOR CORE, AND METHOD FOR MANUFACTURING IRON CORE AND MOTOR CORE 审中-实审
公开(公告)号：EP4417716A1
公开(公告)日：2024-08-21
申请号：EP22881064.4
申请日：2022-10-12
申请人： NIPPON STEEL CORPORATION
发明人： NATORI, Yoshiaki , TAKEDA, Kazutoshi , YASHIKI, Hiroyoshi , FUKUCHI, Minako
IPC分类号： C21D8/12 , C21D9/00 , C22C38/00 , C22C38/14 , C22C38/60 , H01F41/02 , H01F1/147 , C23C22/00
CPC分类号： H01F1/147 , H01F41/02 , C21D8/12 , C21D9/00 , C22C38/00 , C22C38/14 , C22C38/60 , C23C22/00
摘要： Provided is a non-oriented electrical steel sheet including a base steel sheet and an insulating coating film formed on a surface of the base steel sheet, wherein the base steel sheet has a chemical composition containing, in mass%, C: 0.0030% or less, Si: 3.2 to 6.5%, Mn: 0.05 to 3.5%, P: 0.005 to 0.10%, S: 0.0030% or less, Al: 1.0% of less, Ti: 0.0030% or less, B: 0.0010% or less, Mo: 0.030% or less, V: 0.0010% or less, Ca: 0 to 0.0050%, Mg: 0 to 0.0050%, and REM: 0 to 0.0050%, with a balance being Fe and impurities, and satisfying [S-5/3×Mg-4/5×Ca-1/4×REM 0].

8. 发明公开

EP4407643A1 METHOD FOR MANUFACTURING LAMINATED IRON CORE 审中-实审
公开(公告)号：EP4407643A1
公开(公告)日：2024-07-31
申请号：EP22906955.4
申请日：2022-09-22
申请人： JFE Steel Corporation
发明人： OMURA, Takeshi , ICHIHARA, Yoshihisa , YOSHIZAKI, Souichiro
IPC分类号： H01F41/02 , C21D8/12 , C22C38/00 , C22C38/60
CPC分类号： C22C38/00 , C21D8/12 , H01F41/02 , C22C38/60
摘要： Methods for manufacturing a laminated core that enable good iron loss properties to be achieved are provided.
A method for manufacturing a laminated core of the present invention includes processing an electrical steel sheet into pieces of the electrical steel sheet that have a predetermined shape, by using a pulsed laser having a beam diameter of 200 um or less and a pulse width of a nanosecond or more or by using a continuous laser having a beam diameter of 200 um or less, the electrical steel sheet including an insulating coating on a surface, the insulating coating having a roughness factor of a surface of 2.0 or greater; and stacking the pieces of the electrical steel sheet resulting from the processing. Another method for manufacturing a laminated core of the present invention includes processing an electrical steel sheet into pieces of the electrical steel sheet that have a predetermined shape, the processing being performed by using a picosecond pulsed laser or a femtosecond pulsed laser or being performed in water or in a state in which a water film is present on a surface of the electrical steel sheet by using a pulsed laser having a pulse width of a nanosecond or more or by using a continuous laser, the electrical steel sheet including an insulating coating on the surface; and stacking the pieces of the electrical steel sheet resulting from the processing.

10. 发明公开

EP4403655A1 ELECTROMAGNETIC SOFT IRON BAR STEEL 审中-实审
公开(公告)号：EP4403655A1
公开(公告)日：2024-07-24
申请号：EP22892322.3
申请日：2022-04-28
申请人： JFE Steel Corporation
发明人： ICHIMIYA, Katsuyuki , NAKASHIMA, Koichi , IMANAMI, Yuta
IPC分类号： C21D8/12 , C22C38/00 , C22C38/06 , C22C38/60
CPC分类号： C22C38/00 , C22C38/06 , C21D8/12 , C22C38/60
摘要： A steel material having excellent cold workability as well as a high level of magnetic properties and machinability by cutting. As the steel material, an electrical soft iron steel bar includes the following chemical composition, in mass%: C: less than 0.02 %, Si: less than 0.023 %, Mn: 0.01 % or more to 0.50 % or less, P: 0.002 % or more to 0.020 % or less, S: more than 0.02 % to 0.050 % or less, Al: more than 0.010 % to 0.050 % or less, N: 0.0010 % or more to 0.0100 % or less, and B: 0.0003 % or more to 0.0065 % or less, with the balance being iron and inevitable impurity.

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