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公开(公告)号：US12129534B2
公开(公告)日：2024-10-29
申请号：US17801134
申请日：2021-05-07
发明人： Yuri Toda , Daisuke Maeda , Shingo Fujinaka
IPC分类号： C22C38/02 , C21D6/00 , C21D8/02 , C21D9/46 , C22C38/00 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18
CPC分类号： C22C38/18 , C21D6/001 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D9/46 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C21D2211/002 , C21D2211/005
摘要： This hot-stamping formed body has a predetermined chemical composition and has a metallographic structure consisting of, by area ratio, a total of 10% to 30% of ferrite and granular bainite and a remainder in microstructure consisting of one or more of martensite, bainite, and tempered martensite, and, in textures of a surface layer region and an inside region, ratios between a pole density of an orientation group consisting of {001} to {001} and a pole density of an orientation group consisting of {111} to {111} are controlled.
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公开(公告)号：US12123069B2
公开(公告)日：2024-10-22
申请号：US17286148
申请日：2019-10-16
IPC分类号： C21D9/46 , C21D1/20 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/42 , C22C38/44 , C22C38/50 , C22C38/54 , C22C38/58 , C22C38/60
CPC分类号： C21D9/46 , C21D1/20 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/42 , C22C38/44 , C22C38/50 , C22C38/54 , C22C38/58 , C22C38/60 , C21D2211/002 , C21D2211/005 , C21D2211/008
摘要： A steel sheet having a specified chemical composition and a method for producing the steel sheet. The steel sheet has a microstructure comprising ferrite: 5% or less, and at least one of upper bainite, fresh martensite, tempered martensite, lower bainite, and retained γ: 95% to 100% by area percentage, and retained γ: 4% to 15% by volume percentage. Retained γUB has a specified area percentage SγUB, retained γLB has a specified distribution number NγLB, and at least one of (i) fresh martensite has a specified equivalent circular grain diameter and aspect ratio and (ii) retained γ grains has a specified equivalent circular grain diameter and aspect ratio.
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公开(公告)号：US12110566B2
公开(公告)日：2024-10-08
申请号：US17913106
申请日：2021-03-10
申请人： MOTP LLC
发明人： Michio Shimotomai
IPC分类号： C21D9/00 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/34 , C22C38/38
CPC分类号： C21D9/0081 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/34 , C22C38/38 , C21D2211/002 , C21D2211/004 , C21D2211/008 , C22C2202/04
摘要： To provide a steel and a manufacturing method thereof that can contribute to achieving both high strength and hydrogen embrittlement resistance. The steel has a chemical composition represented by: C: 0.15% to 0.35%; Si: 0.8% to 2.5%; Mn: 0.8% to 2.5%; Al: 0.03% to 2.0%; N: 0.002% to 0.010%; P: 0.01% or less; S: 0.01% or less; O: 0.01% or less; B: 0.0001% to 0.005%; Nb: 0.0% to 0.05%; Ti: 0.0% to 0.2%; V 0.0% to 0.05%; Mo: 0.0% to 1.0%; Cr: 0.0% to 1.0%; Ni: 0.01% to 1.0%; Cu: 0.05% to 1.0%; at least one of Ca, Mg and REM: 0.0005% to 0.01%; and the balance: Fe and impurities, and has a martensite phase or/and a bainite phase in which ε-carbide is dispersedly precipitated.
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公开(公告)号：US20240301537A1
公开(公告)日：2024-09-12
申请号：US18578652
申请日：2022-09-08
发明人： Mitsuru YOSHIDA , Kazuo HIKIDA
IPC分类号： C22C38/38 , C21D1/18 , C21D6/00 , C21D8/02 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/28
CPC分类号： C22C38/38 , C21D1/18 , C21D6/001 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D9/46 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/28 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C21D2211/009
摘要： This hot-rolled steel sheet has a predetermined chemical composition, in which, when a region of ⅛ to ⅜ of a sheet thickness in a sheet thickness direction from a surface is defined as a ¼ depth position, a microstructure at the ¼ depth position includes, by area fraction, retained austenite: less than 3.0%, ferrite: less than 30.0%, and pearlite: less than 5.0%, at the ¼ depth position, an average number density of Ti-based carbides having a longest diameter of 15 nm or more is 1.0×104/mm2 or more, and an average grain size dq is 15.0 μm or less, and a tensile strength is 980 MPa or more.
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公开(公告)号：US12084739B2
公开(公告)日：2024-09-10
申请号：US17424050
申请日：2020-02-12
申请人： Kobe Steel, Ltd.
发明人： Toshio Murakami , Keita Nakayama
CPC分类号： C21D9/46 , C21D8/0226 , C21D8/0236 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C21D2211/009
摘要： Disclosed is a steel sheet including predetermined elements in each predetermined amount, with the balance consisting of iron and inevitable impurities, wherein a total area ratio of bainite, bainitic ferrite, martensite, residual austenite, and a martensite-austenite mixed structure is 95% or more and 100% or less, a total area ratio of ferrite and pearlite is less than 5%, an area ratio of the martensite-austenite mixed structure is 5% or more and 30% or less, an average section length of the martensite-austenite mixed structure is 0.32 μm or less, and a proportion of an area of a region in ferrite, bainitic ferrite, and martensite where no cementite is present to the total area of ferrite, bainitic ferrite, and martensite is 3.0% or more and 5.0% or less.
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公开(公告)号：US20240295000A1
公开(公告)日：2024-09-05
申请号：US18572529
申请日：2022-07-07
IPC分类号： C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/60 , C23C2/06 , C23C2/12 , C23C2/40 , C25D3/22 , C25D3/44
CPC分类号： C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/0273 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/60 , C23C2/06 , C23C2/12 , C23C2/40 , C25D3/22 , C25D3/44 , C21D2211/001 , C21D2211/002 , C21D2211/003 , C21D2211/005 , C21D2211/008
摘要： A coated and optionally temper-rolled dual phase steel strip with a tensile strength Rm of 580-720 MPa and a yield strength Rp of 310-430 MPa high strength having improved formability. The invention also relates to a method for producing such steel strip and the use thereof.
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公开(公告)号：US12077831B2
公开(公告)日：2024-09-03
申请号：US17415532
申请日：2019-10-25
发明人： Shimpei Yoshioka , Yoshihiko Ono , Yuma Honda , Nobuyuki Nakamura
IPC分类号： C21D9/46 , B22D11/18 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C23C2/06
CPC分类号： C21D9/46 , B22D11/182 , C21D8/0226 , C21D8/0236 , C21D8/0273 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C23C2/06 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008
摘要： A steel sheet having a specified chemical composition and a tensile strength of 1,320 MPa or more, and methods for producing the steel sheet. The steel sheet has a specified microstructure including martensite and bainite, the total area fraction of the martensite and the bainite being 95% or more and 100% or less, the balance being one or more selected from ferrite and retained austenite. The forumulae [% Ti]+[% Nb]>0.007 and [% Ti]×[% Nb]2≤7.5×10−6 are satisfied in the chemical composition.
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公开(公告)号：US20240287638A1
公开(公告)日：2024-08-29
申请号：US18573247
申请日：2021-07-16
申请人： ArcelorMittal
发明人： Pierrick FORT , Aude NADLER , Kangying ZHU , Astrid PERLADE , Michel SOLER , Frédéric KEGEL
CPC分类号： C21D9/46 , C21D8/0226 , C21D8/0236 , C21D8/0273 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C21D2261/00
摘要： A process for manufacturing a steel part, including the following successive steps: providing a steel sheet having a composition including by weight percent: C: 0.05—0.25%, Mn: 3.5-8%, Si 0.1-2%, Al: 0.01-3%, S≤0.010%, P≤0.020%, N≤0.008%, the remainder of the composition being iron and unavoidable impurities resulting from the smelting, and having a microstructure, in surface fraction, between 10% and 50% of retained austenite, 50% or more of the sum of ferrite, bainite and tempered martensite, less than 5% of fresh martensite, less than 2% of carbides and a carbon [C]A content in austenite, strictly more than 0.4% and strictly less than 0.7%, cutting the steel sheet to a predetermined shape, to obtain a steel blank, heating the steel blank to a temperature Twarm from (Md30-150° C.) to (Md30-50° C.), punching or shearing and forming the heat-treated steel blank at the Twarm temperature to obtain a steel part.
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公开(公告)号：US20240287636A1
公开(公告)日：2024-08-29
申请号：US18564783
申请日：2022-05-19
发明人： Junya Tobata , Yuki Toji , Hidekazu Minami
IPC分类号： C21D9/46 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C23C2/06 , C23C2/40 , C25D3/22
CPC分类号： C21D9/46 , C21D8/0226 , C21D8/0236 , C21D8/0273 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C23C2/06 , C23C2/40 , C25D3/22 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008
摘要： A high strength steel sheet includes a specific microstructure having a specific chemical composition and satisfying the formulas (1) and (2) defined below:
KAM
(
S
)
/
KAM
(
C
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10.发明公开公开(公告)号：US20240254586A1
公开(公告)日：2024-08-01
申请号：US18625591
申请日：2024-04-03
申请人： ArcelorMittal
IPC分类号： C21D9/48 , B32B15/01 , C21D1/673 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/44 , C22C38/48 , C22C38/50 , C22C38/54 , C23C2/02 , C23C2/06 , C23C2/12 , C23C2/28 , C23C2/40
CPC分类号： C21D9/48 , B32B15/012 , B32B15/013 , C21D1/673 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C22C38/001 , C22C38/004 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/44 , C22C38/48 , C22C38/50 , C22C38/54 , C23C2/02 , C23C2/022 , C23C2/024 , C23C2/06 , C23C2/12 , C23C2/28 , C23C2/40 , C21D2211/002 , C21D2211/008
摘要： A method for manufacture of a hot-rolled steel sheet which includes: producing a liquid steel to which manganese, silicon, niobium, and chromium are added, the additions being made in a vacuum chamber, then desulfurizing the liquid metal without increasing its nitrogen content, then adding titanium, said additions being made so as to obtain a liquid metal having a chemical composition where the titanium and nitrogen contents satisfy: Ti/N>3.42, and the carbon, manganese, chromium, and silicon contents satisfy: 2.6C+Mn/5.3+Cr/13+Si/15>=1.1%, then casting a semi-finished product, then heating said semi-finished product to a temperature between 1250° C. and 1300° C. for a holding period at this temperature between 20 minutes and 45 minutes, then hot rolling said semi-finished product to a rolling end temperature TFL between 825° C. and 950° C., to obtain a hot-rolled sheet, then coiling said hot-rolled sheet at a temperature between 500° C. and 750° C. to obtain a hot-rolled and coiled sheet, then pickling the oxide layer formed in the previous steps.
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