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81. 发明公开

EP4015660A1 STEEL SHEET, MEMBER, METHOD FOR PRODUCING SAID STEEL SHEET AND METHOD FOR PRODUCING SAID MEMBER 审中-公开
公开(公告)号：EP4015660A1
公开(公告)日：2022-06-22
申请号：EP20881194.3
申请日：2020-10-23
申请人： JFE Steel Corporation
发明人： HIRASHIMA, Takuya , YOSHIOKA, Shimpei , KANEKO, Shinjiro , YOSHIMOTO, Soshi , HASHIMUKAI, Tomohiro
IPC分类号： C21D9/46 , C22C38/00 , C22C38/06 , C22C38/60
摘要： An object is to provide a high strength steel sheet having excellent shape uniformity and excellent delayed fracture resistance, a member, and methods for producing them.
The steel sheet of the present invention has a steel microstructure containing, in area fraction, martensite: from 20% to 100%, ferrite: from 0% to 80%, and another metal phase: 5% or less, and in which a ratio of a dislocation density in metal phases on a surface of the steel sheet to a dislocation density in the metal phases in a thicknesswise central portion of the steel sheet is from 30% to 80%. The maximum amount of warpage of the steel sheet when the steel sheet is sheared to a length of 1 m in a rolling direction is 15 mm or less.

82. 发明公开

EP4012057A1 METAL STRIP QUENCHING DEVICE, METAL STRIP QUENCHING METHOD, AND METHOD FOR PRODUCING METAL STRIP PRODUCT 审中-实审
公开(公告)号：EP4012057A1
公开(公告)日：2022-06-15
申请号：EP20871593.8
申请日：2020-09-18
申请人： JFE Steel Corporation
发明人： YOSHIMOTO Soshi
IPC分类号： C21D9/573 , C22C38/00 , C22C38/60 , C21D1/00
摘要： An object is to provide a rapid cooling apparatus and a rapid cooling method by which, in a continuous annealing system or in a hot-dip galvanizing system, the temperature of a metal strip after rapid cooling can be controlled in a very high degree of freedom, and to also provide a method for producing a metal strip product.
A metal-plate rapid cooling apparatus 11 is a rapid cooling apparatus configured to cool a metal strip 1 while conveying the metal strip 1 in a horizontal direction. The metal-plate rapid cooling apparatus 11 includes a cooling fluid ejection device including one set of nozzles 21 and 22 or a plurality of sets of nozzles 21 and 22 arranged in the horizontal direction, the nozzles 21 and 22 being configured to eject a cooling fluid 222 onto the metal strip 1 from both sides of the metal strip 1; cooling fluid removing rolls 51 and 52 configured to remove a remained fluid from the metal strip 1 onto which the cooling fluid has been ejected; and movable masking plates 31 and 32 disposed on both sides of a metal strip pass line along which the metal strip 1 passes, the movable masking plates 31 and 32 each being disposed between the metal strip pass line and the nozzles, the movable masking plates 31 and 32 being configured to move in the horizontal direction to adjust a cooling start position and control a distance from the cooling start position to the cooling fluid removing rolls 51 and 52, the cooling start position being a position at which the metal strip 1 starts to be cooled with the cooling fluid 222.

83. 发明公开

EP4006184A1 NON-ORIENTED ELECTROMAGNETIC STEEL SHEET AND METHOD FOR MANUFACTURING SAME 审中-公开
公开(公告)号：EP4006184A1
公开(公告)日：2022-06-01
申请号：EP20847077.3
申请日：2020-04-28
申请人： JFE Steel Corporation
发明人： YOSHIZAKI, Souichiro , MIYAMOTO Yukino , ZAIZEN Yoshiaki , SENDA Kunihiro
IPC分类号： C21D8/12 , C21D9/46 , C23C10/08 , C22C38/00 , C22C38/06 , C22C38/60 , B21B1/22 , H01F1/147 , C23C22/00
摘要： Provided is a non-oriented electrical steel sheet having excellent adhesion with an insulating coating even if the thickness of the insulating coating is reduced. The non-oriented electrical steel sheet of the present disclosure has an insulating coating on at least one surface of the steel sheet, where the insulating coating has a P-concentrated layer on both a surface side and an interface side with a steel substrate, and a P concentration of the P-concentrated layer is higher than a P concentration in the steel substrate.

84. 发明公开

EP4001447A1 STEEL SHEET, MEMBER, AND METHODS FOR PRODUCING SAME 有权
公开(公告)号：EP4001447A1
公开(公告)日：2022-05-25
申请号：EP20856777.6
申请日：2020-08-25
申请人： JFE Steel Corporation
发明人： HIRASHIMA Takuya , YOSHIOKA Shimpei , KANEKO Shinjiro , YOSHIMOTO Soshi , HASHIMUKAI Tomohiro , ONO Yoshihiko
IPC分类号： C22C38/00 , C21D1/18 , C21D1/63 , C21D9/46 , C21D9/573 , C22C38/06 , C22C38/60
摘要： An object of the present invention is to provide a steel sheet and a member that have a high strength, excellent shape uniformity, and excellent delayed fracture resistance and methods for producing the steel sheet and the member.
A steel sheet according to the present invention includes a steel microstructure including, by area, martensite: 20% or more and 100% or less, ferrite: 0% or more and 80% or less, and the balance: 5% or less. A residual stress generated at the transverse center of the steel sheet when the steel sheet is subjected to a V-bending process is 800 MPa or less. A residual stress generated at the transverse end of the steel sheet when the steel sheet is subjected to a V-bending process is 90% or more and 110% or less of the residual stress generated at the transverse center of the steel sheet. The maximum amount of warpage of the steel sheet sheared to a length of 1 m in the longitudinal direction is 15 mm or less.

85. 发明公开

EP3992312A1 METHOD FOR PRODUCING NON-ORIENTED ELECTROMAGNETIC STEEL SHEET, METHOD FOR PRODUCING MOTOR CORE, AND MOTOR CORE 审中-公开
公开(公告)号：EP3992312A1
公开(公告)日：2022-05-04
申请号：EP20832967.2
申请日：2020-06-15
申请人： JFE Steel Corporation
发明人： ZAIZEN Yoshiaki , ODA Yoshihiko , OKUBO Tomoyuki , TANAKA Takaaki , MIYAMOTO Yukino
IPC分类号： C21D8/12 , C21D9/00 , C21D9/46 , C22C38/00 , C22C38/14 , C22C38/60 , H01F1/147
摘要： In the production of a non-oriented electrical steel sheet by subjecting a steel slab having a component composition containing, by mass%, C: not more than 0.0050%, Si: 2.8 to 6.5%, Mn: 0.05 to 2.0%, Zn: 0.0005 to 0.0050% and satisfying Si + Al ≥ 4 mass% to a hot rolling, a hot-band annealing, a cold rolling and a finish annealing, the conditions of the finish annealing are controlled such that a yield stress of the steel sheet after the finish annealing is not less than 480 MPa. Also, when a motor core is produced by using the above steel sheet, there can be provided a non-oriented electrical steel sheet capable of producing a high strength rotor core and a stator core having excellent magnetic properties after stress-relief annealing as the same raw material where the stator core is subjected to a stress relief annealing at a soaking temperature of 780 to 950°C in an atmosphere having a nitrogen content of not more than 30 vol% and a dew point of not higher than -20°C to suppress nitriding of steel sheet surface, while a motor core is produced with such a steel sheet.

86. 发明公开

EP3974557A1 ALLOY STEEL FOR RAILWAY COUPLER 审中-实审
公开(公告)号：EP3974557A1
公开(公告)日：2022-03-30
申请号：EP20888730.7
申请日：2020-12-15
申请人： Korea Railroad Research Institute
发明人： MUN, Hyung-Suk , PARK, Jung-Joon , LEE, Sang-Keun
IPC分类号： C22C38/42 , C22C1/05 , C22C38/44 , C22C38/46 , C22C38/60 , B61G1/00
摘要： The present disclosure relates to an alloy steel for a railway vehicle coupler. More particularly, the present disclosure relates to an alloy steel for a railway vehicle coupler, the alloy steel being able to meet all mechanical properties required for AAR couplers mainly used in Korea (i.e., the Republic of Korea) and China (i.e., the People's Republic of China) and mechanical properties required for CA-3 couplers mainly used in Russia (i.e., the Russian Federation) and the like, thereby enabling the railway vehicle coupler to be safely used in the railway system connecting Russia and the other Northeast Asian countries.

87. 发明公开

EP3960888A1 METHOD FOR PRODUCING GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET 审中-公开
公开(公告)号：EP3960888A1
公开(公告)日：2022-03-02
申请号：EP20796035.2
申请日：2020-04-22
申请人： JFE Steel Corporation
发明人： EHASHI Yuiko , TAKENAKA Masanori , SUGIHARA Hirokazu , YOSHIMOTO Soshi
IPC分类号： C21D8/12 , C22C38/00 , C22C38/60 , H01F1/147
摘要： When a grain oriented electrical steel sheet is produced by heating a steel slab containing, by mass%, C: 0.02-0.10%, Si: 2.0-5.0%, Mn: 0.01-1.00%, sol. Al: 0.01-0.04%, N: 0.004-0.020% and S+Se: 0.002-0.040% to a temperature of higher than 1280°C, and subjecting the sheet to a hot rolling, a hot-band annealing, a single cold rolling or two or more cold rollings having an intermediate annealing between each cold rolling and a primary recrystallization annealing combined with a decarburization annealing, applying an annealing separator onto a steel sheet surface, and subjecting the sheet to a finish annealing and a flattening annealing, a rapid cooling is conducted at an average cooling rate of not less than 200°C/s from 800°C to 300°C in the cooling process from a maximum achieving temperature in at least one annealing of the hot-band annealing and the intermediate annealing, whereby a grain oriented electrical steel sheet having excellent magnetic properties is stably produced using a raw material containing an inhibitor-forming ingredient.

88. 发明公开

EP3950993A1 CARBURIZED PART AND METHOD FOR MANUFACTURING SAME 审中-公开
公开(公告)号：EP3950993A1
公开(公告)日：2022-02-09
申请号：EP19923068.1
申请日：2019-03-29
申请人： NIPPON STEEL CORPORATION
发明人： UMEHARA, Miyuri , YAMASAKI, Shingo
IPC分类号： C22C38/00 , C21D1/06 , C22C38/60 , C21D9/32
摘要： The present invention provides a method for obtaining a carburized part using steel high in content of Cr and realizing bending fatigue strength at an extremely high level by vacuum carburizing. The carburized part is obtained by treating a steel material having a predetermined chemical composition by vacuum carburizing provided with a carburizing period of 10 to 200 minutes at 850 to 1100°C and a diffusion period of 15 to 300 minutes at 850 to 1100°C, then quenching and tempering it.

89. 发明公开

EP3950975A1 STEEL SHEET 审中-公开
公开(公告)号：EP3950975A1
公开(公告)日：2022-02-09
申请号：EP20785386.2
申请日：2020-03-12
申请人： NIPPON STEEL CORPORATION
发明人： TAKEDA, Kengo , KAWATA, Hiroyuki , YOKOYAMA, Takafumi , NAKANO, Katsuya
IPC分类号： C21D9/46 , C22C38/00 , C22C38/60
摘要： Provided are: a steel sheet having a high strength and excellent hydrogen embrittlement resistance; and a method of producing the same. The steel sheet has prescribed chemical composition and structure, in which a standard deviation σ of Mn concentration satisfies σ ≥ 0.15 Mn ave (wherein, Mn ave represents an average Mn concentration) and a region with a Mn concentration of higher than (Mn ave + 1.3σ) has a circle-equivalent diameter of less than 10.0 µm. The method of producing the steel sheet includes: the hot rolling step that includes finish rolling a slab having a prescribed chemical composition under prescribed conditions; the step of coiling the thus obtained hot-rolled steel sheet at a coiling temperature of 450 to 700°C; and the step of cold rolling the hot-rolled steel sheet and subsequently annealing this steel sheet at 800 to 900°C.

90. 发明授权

EP3546609B1 NON-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR 有权转让
公开(公告)号：EP3546609B1
公开(公告)日：2022-02-02
申请号：EP17873044.6
申请日：2017-11-15
发明人： NAKAJIMA Hiroaki , UESAKA Masanori , ZAIZEN Yoshiaki , OKUBO Tomoyuki , ODA Yoshihiko
IPC分类号： C22C38/06 , C22C38/00 , C22C38/60 , C21D6/00 , C21D8/12 , C22C38/04 , C21D8/02 , C22C38/10 , C22C38/02 , H01F1/147

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