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公开(公告)号：US20230002874A1
公开(公告)日：2023-01-05
申请号：US17781231
申请日：2021-01-08
发明人： Yuri TODA , Shinichiro TABATA , Kodai MURASAWA , Daisuke MAEDA , Kazuo HIKIDA
IPC分类号： C22C38/38 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/22 , C22C38/16 , C22C38/10 , C22C38/08 , C22C38/06 , C22C38/02 , C22C38/00
摘要： A hot-stamping formed body has a predetermined chemical composition and includes microstructure which includes residual austenite of which an area ratio is 5% or more and less than 10%. Among grain boundaries of crystal grains of bainite and tempered martensite in the microstructure, a ratio of a length of a grain boundary having a rotation angle in a range of 55° to 75° to a total length of a grain boundary having a rotation angle in a range of 4° to 12°, a grain boundary having a rotation angle in a range of 49° to 54°, and a grain boundary having a rotation angle in a range of 55° to 75° to the direction as a rotation axis is 30% or more. The tensile strength of the hot-stamping formed body is 1500 MPa or more.
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公开(公告)号：US20230002848A1
公开(公告)日：2023-01-05
申请号：US17784901
申请日：2020-12-15
发明人： Genki ABUKAWA , Masafumi AZUMA , Eisaku SAKURADA , Shohei YABU
IPC分类号： C21D9/46 , B32B15/01 , C22C38/38 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/16 , C22C38/08 , C22C38/06 , C22C38/02 , C22C38/00 , C21D8/02 , C21D6/00
摘要： This hot-rolled steel sheet has a predetermined chemical composition, a microstructure includes 80% or more of tempered martensite by a volume percentage and a remainder consisting of one or more of ferrite, pearlite, bainite, fresh martensite, and residual austenite, the tempered martensite includes 5×109 pieces/mm3 or more of precipitates containing Ti and having an equivalent circle diameter of 5 nm or less per unit volume, in a surface layer region that is a range from a surface to a 1/10 position of a sheet thickness, a sum of an average pole density of a crystal orientation group consisting of {211} to {111} and a pole density in a crystal orientation of {110} is 6.0 or less, and a tensile strength is 980 MPa or more.
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公开(公告)号：US11545285B2
公开(公告)日：2023-01-03
申请号：US16858872
申请日：2020-04-27
发明人： Yasuko Kudo , Toshiki Akazawa , Yu Maeda
IPC分类号： H01F1/147 , C22C33/02 , B22F9/08 , H01F1/153 , C22C45/02 , B22F1/00 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/20 , C22C38/26 , C22C33/00 , B22F9/00 , C22C38/38 , B22F1/10 , B22F1/054 , B22F9/10 , C22C38/28 , C22C38/32 , C22C38/34 , H01F1/20 , H01F27/255 , H01F41/02 , H01F3/08
摘要： A soft magnetic powder of the invention has a composition represented by Fe100-a-b-c-d-e-fCuaSibBcMdM′eXf (at %) [wherein M is Nb, W, Ta, Zr, Hf, Ti, or Mo, M′ is V, Cr, Mn, Al, a platinum group element, Sc, Y, Au, Zn, Sn, or Re, X is C, P, Ge, Ga, Sb, In, Be, or As, and a, b, c, d, e, and f are numbers that satisfy the following formulae: 0.1≤a≤3, 0
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公开(公告)号：US20220396855A1
公开(公告)日：2022-12-15
申请号：US17770328
申请日：2020-10-08
发明人： Kazuki Endoh , Yoshiyasu Kawasaki , Yuki Toji
IPC分类号： C22C38/00 , C22C38/02 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/60 , C21D8/02 , C21D9/46 , C22C38/04 , C23C2/06 , C23C2/40
摘要： Provided is a high strength steel sheet that has a predetermined chemical composition and is manufactured under optimum conditions, the high strength steel sheet having a steel microstructure including, by area, ferrite: 30% or more and 80% or less, martensite: 5% or more and 35% or less, and retained austenite: 8% or more, wherein the quotient of the area fraction of grains of the retained austenite, the grains having an aspect ratio of 2.0 or more and a minor axis length of 1 μm or less, divided by the total area fraction of the retained austenite is 0.3 or more, wherein the quotient of the average Mn content (mass %) in the retained austenite divided by the average Mn content (mass %) in the ferrite is 1.5 or more.
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公开(公告)号：US20220389534A1
公开(公告)日：2022-12-08
申请号：US17761719
申请日：2020-09-17
发明人： Jianchun WU
IPC分类号： C21D9/52 , C21D8/02 , C21D1/613 , C21D6/00 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C22C38/16 , B22D11/06
摘要： Disclosed are a Nb microalloyed high strength high hole expansion steel and a production method therefor. The chemical ingredients of the steel in percentages by weight are as follows: 0.01-0.05% of C, 0.2-0.6% of Si, 0.8-1.5% of Mn, ≤0.02% of P, ≤0.005% of S, ≤0.008% of N, 250, total oxygen [O]T is 0.007-0.020%, and the balance is Fe and inevitable impurities. In the present invention, microalloy elements such as Nb are selectively added, and the basicity of slag, the type and melting point of the inclusion in steel, the content of free oxygen in molten steel, and the content of acid-soluble aluminum Als during the smelting process are controlled, and then, a strip is cast by means of twin-roll thin strip continuous casting, and the strip directly enters a lower closed chamber in a non-oxidizing atmosphere and enters an online rolling mill for hot rolling in closed conditions, and after rolling, the strip steel is cooled by air atomization cooling, and finally, the produced steel coil can be used directly as a hot rolled plate or can be used after acid pickling and leveling.
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公开(公告)号：US20220385119A1
公开(公告)日：2022-12-01
申请号：US17775754
申请日：2020-11-13
IPC分类号： H02K1/02 , C22C38/60 , C22C38/16 , C22C38/10 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00
摘要： The present invention is a stator core (21) including a plurality of split cores (30), in which the plurality of split cores (30) are configured by laminating core pieces (40) made of an electrical steel sheet, the electrical steel sheet is a predetermined electrical steel sheet, and, in the core pieces (40) of at least one split core (30) in the plurality of split cores (30), the radial directions of teeth (41) and extension directions of core backs (42) are all along a direction in which magnetic characteristics of the electrical steel sheet are excellent.
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公开(公告)号：US20220385118A1
公开(公告)日：2022-12-01
申请号：US17775728
申请日：2020-11-13
IPC分类号： H02K1/02 , C22C38/60 , C22C38/16 , C22C38/10 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C22C38/08
摘要： An electrical steel sheet (300) is formed such that centerlines of four magnetic poles (salient poles) of a rotor core (111) coincide with a direction of easy magnetization (ED1) or (ED2). In addition, the electrical steel sheets (300) are laminated such that the directions of easy magnetization (ED1) and (ED2) are aligned.
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公开(公告)号：US20220348263A1
公开(公告)日：2022-11-03
申请号：US17623111
申请日：2020-06-26
发明人： Mai NAGANO , Shigeru YONEMURA , Akihiro UENISHI
IPC分类号： B62D25/04 , B62D25/06 , B62D25/02 , B60R19/34 , B62D25/20 , B62D21/15 , B62D29/00 , B21D53/88 , C21D9/46 , C21D6/00 , C22C38/38 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/02 , C22C38/00
摘要： A shock absorbing member which can increase impact absorption energy and also enables thinning of a steel sheet that is a starting material, a method for producing the shock absorbing member, and a method for producing a steel sheet for cold plastic working are provided. The shock absorbing member includes a ridge portion formed in a curved shape as viewed from a longitudinal direction, and a wall portion extending from the ridge portion. In the wall portion, a ratio σ5/τ5 between a tensile stress σ5 when an elongation in a tensile test is 5% and a shear stress τ5 when a shear strain in a shear test is 5√3% is 1.70 or less, or a ratio σ10/τ10 between a tensile stress σ10 when an elongation in a tensile test is 10% and a shear stress τ10 when a shear strain in a shear test is 10√3% is 1.70 or less.
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79.发明申请公开(公告)号：US20220341014A1
公开(公告)日：2022-10-27
申请号：US17641186
申请日：2020-09-25
发明人： Kou NISHIMURA , Yoshiharu INOUE
IPC分类号： C22C38/60 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/10 , C22C38/06 , C22C38/00 , C21D8/02
摘要： A ferritic stainless steel sheet is provided that has a predetermined chemical composition, wherein: a grain size number is 6.0 or more; the ferritic stainless steel sheet satisfies the formulas [A+B≥9.0] and [X+Y≥9.0] with respect to crystal orientation intensities of a ferrite phase obtained by X-ray diffraction; and the sheet thickness is 1.0 mm or more. A represents a {111} crystal orientation intensity at a center portion of sheet thickness, B represents a {111} crystal orientation intensity at a ⅛ portion of the sheet thickness, X represents a {322} crystal orientation intensity at a center portion of sheet thickness, and Y represents a {322} crystal orientation intensity at a ⅛ portion of the sheet thickness.
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公开(公告)号：US11473159B2
公开(公告)日：2022-10-18
申请号：US16754081
申请日：2018-11-22
发明人： Tetsuya Hirashima , Takeshi Toyoda
IPC分类号： B32B15/00 , C21D8/02 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16
摘要： Provided is a hot rolled steel sheet comprising a predetermined composition wherein the hot rolled steel sheet comprises first ferrite with an average orientation difference in the same grain of 0.5 to 5.0° in 30 to 70 vol %, at least one type of structures among bainite and second ferrite with an average orientation difference of 0 to less than 0.5° and the first ferrite in a total of 95 vol % or more, a balance microstructure of 5 vol % or less, has an average grain size of the first ferrite of 0.5 to 5.0 μm, and has an average grain size of the other structures of 1.0 to 10 μm. Provided is a method for producing a hot rolled steel sheet comprising rolling where two or more consecutive passes of rolling including a final pass are performed under conditions of a rolling temperature: A point or more and less than Ae3 point etc., and where a total strain amount of all passes satisfying the conditions is 1.4 to 4.0, cooling by a 20 to 50° C./sec average cooling rate, and coiling the steel sheet at 300° C. to 600° C.
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