公开(公告)号：US20240352551A1

公开(公告)日：2024-10-24

申请号：US18684593

申请日：2022-08-25

申请人： POSCO CO., LTD

发明人： Young-Roc IM ,  Sang-Ho UHM ,  Young-Ha KIM

IPC分类号： C21D9/46 ,  C21D1/18 ,  C21D1/84 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38

CPC分类号： C21D9/46 ,  C21D1/18 ,  C21D1/84 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

摘要： Provided is a cold-rolled steel sheet including: by weight %, C: 0.10 to 0.16%, Si: 0.3 to 0.8%, Al: 0.01 to 0.5%, Mn: 2.0 to 3.0%, Cr: 0.001 to 0.5%, Mo: 0.001 to 0.5%, B: 0.0001 to 0.001%, Nb: 0.001 to 0.05%, Ti: 0.001 to 0.05%, P: 0.04% or less (excluding 0%), S: 0.01% or less (excluding 0%), N: 0.01% or less (excluding 0%), a remainder of Fe, and other unavoidable impurities, as a microstructure, by area %, ferrite: 10% or less (excluding 0%), retained austenite: more than 1% to 5% or less, martensite: 25% or more but less than 50%, and bainite: 35% or more but less than 70%. An average size of martensite-austenite (MA) in the bainite is 0.35 to 0.55 μm.

公开(公告)号：US20240337000A1

公开(公告)日：2024-10-10

申请号：US18580976

申请日：2022-07-14

申请人： ThyssenKrupp Steel Europe AG

发明人： Bernd Linke ,  Michael Belde

IPC分类号： C22C38/04 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/18

CPC分类号： C22C38/04 ,  C21D6/002 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D9/46 ,  C22C38/001 ,  C22C38/02 ,  C22C38/18 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009

摘要： A process for producing a cold-rolled flat steel product having a bainitic base microstructure and a correspondingly cold-rolled flat steel product having a bainitic base microstructure.

公开(公告)号：US20240336989A1

公开(公告)日：2024-10-10

申请号：US18580943

申请日：2022-06-23

申请人： POSCO CO., LTD

发明人： Sangseok Kim ,  Minam Park ,  Jaepil Lee ,  Ilchan Jung

IPC分类号： C21D9/46 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/58

CPC分类号： C21D9/46 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/58 ,  C21D2211/001

摘要： Disclosed is an austenitic stainless steel including, in percent by weight (wt %), 0.005 to 0.03% of C, 0.1 to 1% of Si, 0.1 to 2% of Mn, 0.01 to 0.4 of Cu, 0.01 to 0.2 of Mo, 6 to 9% of Ni, 16 to 19% of Cr, 0.01 to 0.2% of N, and the balance of Fe and inevitable impurities, wherein an austenitic stability parameter (ASP) value calculated by 551−462 (C+N)−9.2Si−8.1Mn−13.7Cr−29 (Ni+Cu)−18.5Mo is from 30 to 60, a [100*N]/[Ni+Cu] value is 1.4 or more, an average grain size is less than 5 μm, and a fraction (%) of grains with a grain size of 5 μm or more is less than 10%.

公开(公告)号：US12110578B2

公开(公告)日：2024-10-08

申请号：US17045267

申请日：2019-12-06

申请人： KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

发明人： Changheui Jang ,  Jiho Shin ,  Byeong Seo Kong ,  Hyeon Bae Lee ,  Chaewon Jeong ,  Hyun Woo Koo

IPC分类号： C22C38/58 ,  C21D8/02 ,  C22C38/48

CPC分类号： C22C38/58 ,  C21D8/0226 ,  C22C38/48 ,  C21D2211/001

摘要： Austenitic stainless steel includes 16 to 26 wt % of chromium (Cr), 8 to 22 wt % of nickel (Ni), 0.02 to 0.1 wt % of carbon (C), 0.2 to 1 wt % of niobium (Nb), and 2 to 3.5 wt % of manganese (Mn), and has an austenite matrix, wherein a nanosized niobium carbide (NbC) is precipitated in the austenite matrix, and the nanosized niobium carbide is uniformly dispersed in the austenite matrix. The austenitic stainless steel may further include 0.5 to 1.5 wt % of molybdenum (Mo).

公开(公告)号：US12110571B2

公开(公告)日：2024-10-08

申请号：US16755313

申请日：2018-10-10

申请人： Outokumpu Oyj

发明人： Stefan Lindner ,  Claire Heidecker

IPC分类号： C21D9/48 ,  C21D8/02

CPC分类号： C21D9/48 ,  C21D8/0205 ,  C21D8/0236 ,  C21D8/0273 ,  C21D8/0294 ,  C21D2211/001

摘要： The invention relates to a method for partial hardening of a steel sheet by cold deformation, where the partial hardening of a steel is done by a cold deformation with a multi-step rolling and annealing process and in order to have a steel sheet with a homogeneous thickness steel sheet is used with at least two areas having different values in mechanical and/or physical properties in longitudinal direction of the material.

公开(公告)号：US20240327944A1

公开(公告)日：2024-10-03

申请号：US18411282

申请日：2024-01-12

申请人： Primetals Technologies Austria GmbH

发明人： Kerstin BAUMGARTNER ,  Simon GROSSEIBER ,  Axel RIMNAC ,  Gero SCHWARZ

IPC分类号： C21D9/52 ,  B21B1/26 ,  B22D11/00 ,  B22D11/14 ,  C21D1/18 ,  C21D6/00 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

CPC分类号： C21D9/52 ,  B21B1/26 ,  B22D11/001 ,  B22D11/141 ,  C21D1/18 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0221 ,  C21D8/0247 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005

摘要： A process for production of a TRIP steel strip that includes



supplying a finished strip to a first cooling group of a cooling sector to force-cool the core of the finished strip to a second exit temperature (TA2) in the range 620° C. to 700° C., whereby, upon exiting the first cooling group, the core has a predominantly austenitic microstructure, transporting the finished strip to a third cooling group establishing, during the transport, a second cooling rate of the core of the finished strip in the range −25 K/s to 20 K/s to convert a first portion of the austenitic microstructure into a ferritic microstructure, force-cooling the core of the finished strip in the third cooling group to a third exit temperature (TA3) which is not more than the bainite starting temperature (BS) to at least partially convert a second portion of the austenite into a bainitic microstructure.

公开(公告)号：US20240326399A1

公开(公告)日：2024-10-03

申请号：US18353843

申请日：2023-07-17

申请人： POSCO CO., LTD

发明人： Tae-Jin SONG ,  Min-Seo KOO

IPC分类号： B32B38/00 ,  B23K20/04 ,  B23K20/227 ,  B23K20/24 ,  B23K31/02 ,  B23K101/16 ,  B23K101/18 ,  B23K103/04 ,  B23K103/18 ,  B32B15/01 ,  B32B15/04 ,  B32B15/18 ,  C21D1/18 ,  C21D1/25 ,  C21D8/02 ,  C21D8/04 ,  C21D9/48 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/40 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/18 ,  C23C2/34 ,  C23C2/40 ,  C23C30/00

CPC分类号： B32B38/004 ,  B23K20/04 ,  B23K20/227 ,  B23K20/24 ,  B23K31/02 ,  B32B15/01 ,  B32B15/011 ,  B32B15/015 ,  B32B15/04 ,  B32B15/043 ,  B32B15/18 ,  C21D1/18 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/041 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0463 ,  C21D8/0473 ,  C21D9/48 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/40 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/02 ,  C23C2/022 ,  C23C2/024 ,  C23C2/026 ,  C23C2/06 ,  C23C2/12 ,  C23C2/18 ,  C23C2/34 ,  C23C2/40 ,  C23C30/00 ,  C23C30/005 ,  B23K2101/16 ,  B23K2101/18 ,  B23K2103/04 ,  B23K2103/18 ,  B32B15/012 ,  B32B15/013 ,  B32B2038/0048 ,  B32B2250/03 ,  B32B2250/40 ,  B32B2307/536 ,  B32B2307/552 ,  B32B2307/72 ,  C21D1/25 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2251/02 ,  C22C38/04 ,  Y10T428/12451 ,  Y10T428/12493 ,  Y10T428/12729 ,  Y10T428/12757 ,  Y10T428/12799 ,  Y10T428/12958 ,  Y10T428/12965 ,  Y10T428/12972 ,  Y10T428/12979 ,  Y10T428/12993 ,  Y10T428/2495 ,  Y10T428/24959 ,  Y10T428/24967 ,  Y10T428/24992 ,  Y10T428/26 ,  Y10T428/263 ,  Y10T428/264 ,  Y10T428/265

摘要： A method of manufacturing a low-density clad steel sheet, including: preparing a base material, a lightweight steel sheet including C: 0.3 to 1.0%, Mn: 4.0 to 16.0%, Al: 4.5 to 9.0%, and Fe; preparing cladding materials, each being martensitic carbon steel including C: 0.1 to 0.45%, Mn: 0.1 to 3.0%, and Fe; disposing the base material between the cladding materials to obtain a laminate; welding an edge of the laminate, and heating the welded laminate to 1050 to 1350° C.; finish-rolling the heated laminate to 750 to 1050° C. with a rolling reduction ratio of 30% or more in a first pass, to obtain a hot-rolled steel sheet; coiling the hot-rolled steel sheet at 400 to 700° C.; applying a cold-reduction ratio of 35 to 90% to obtain a cold-rolled steel sheet; and annealing the cold-rolled steel sheet at 550° C. or higher and A3+200° C. or lower of the cladding materials.

公开(公告)号：US20240318287A1

公开(公告)日：2024-09-26

申请号：US18579575

申请日：2022-03-18

申请人： JFE STEEL CORPORATION

发明人： Sho HIGUCHI ,  Yoshiyasu KAWASAKI ,  Tatsuya NAKAGAITO ,  Takako YAMASHITA ,  Tomomi KANAZAWA ,  Shunsuke YAMAMOTO

IPC分类号： C22C38/04 ,  C21D6/00 ,  C21D8/02 ,  C22C38/02 ,  C22C38/06 ,  C23C2/06 ,  C23C2/28

CPC分类号： C22C38/04 ,  C21D6/005 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C22C38/02 ,  C22C38/06 ,  C23C2/06 ,  C23C2/29 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

摘要： A galvanized steel sheet combining high strength with excellent formability, specifically, excellent ductility, hole expansion formability, local ductility, strain hardenability, and dimensional accuracy when forming a member. The base steel sheet has a defined chemical composition and a steel microstructure as follows: ferrite area ratio: 35.0% or more and 95.0% or less, bainitic ferrite area ratio: 1.0% or more and 40.0% or less, tempered martensite area ratio: 50.0% or less (including 0%), retained austenite area ratio: 1.5% or more, fresh martensite area ratio: 20.0% or less (including 0 %), SBF+STM+2×SMA: 10.0% or more and less than 65.0%, SBF+STM: 3.0 % or more and 60.0% or less, SMA1/SMA: 0.40 or less, IDR [% Cγ]: 0.16% or more, and tensile strength: 590 MPa or more and less than 980 MPa.

公开(公告)号：US20240318273A1

公开(公告)日：2024-09-26

申请号：US18574063

申请日：2022-08-03

申请人： Central Iron & Steel Research Institute

发明人： Jing NING ,  Jie SU ,  Zhuoyue YANG ,  Qi GAO ,  Yali DING ,  Jiayan CHEN ,  Ao WANG ,  Geng LIU

IPC分类号： C21D8/00 ,  C21D1/18 ,  C21D1/28 ,  C21D6/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/34 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48

CPC分类号： C21D8/005 ,  C21D1/18 ,  C21D1/28 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/34 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C21D2211/001 ,  C21D2211/008

摘要： The present application discloses a high-toughness ultrahigh-strength steel and a manufacturing method thereof, and belongs to the technical field of metal materials. The present application is intended to solve the problem that the existing low-alloy ultrahigh-strength steel has poor toughness and poor hardenability. The high-toughness ultrahigh-strength steel includes the following elements in mass percentages: C: 0.27% to 0.35%; Si: 1.10% to 1.70%; Mn: 0.70% to 1.10%; Cr: 1.00% to 1.40%; Ni: 0.10% to 0.50%; Mo: 0.05% to 0.50%; W: 0.05% to 0.10%; Nb: 0.01% to 0.04%; and iron and unavoidable impurities: the balance. The high-toughness ultrahigh-strength steel of the present application has excellent strength, toughness and hardenability.

公开(公告)号：US20240309500A1

公开(公告)日：2024-09-19

申请号：US18268580

申请日：2021-12-10

申请人： POSCO Co., Ltd

发明人： Hyung-gu Kang ,  Mi-nam Park ,  Youngjun Kim ,  Youngjin Kwon ,  Gyujin Jo

IPC分类号： C22C38/54 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44

CPC分类号： C22C38/54 ,  C21D6/004 ,  C21D8/0205 ,  C21D8/0226 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C21D2211/001 ,  C21D2211/004

摘要： Disclosed is an austenitic stainless steel with improved corrosion resistance and machinability. The austenitic stainless steel with improved corrosion resistance and machinability may comprise, in percent by weight (wt %), 0.05% or less of C (excluding 0), 2% or less of Si (excluding 0), 2% or less of Mn (excluding 0), 0.01% or less of S, 16 to 22% of Cr, 9 to 15% of Ni, 3% or less of Mo (excluding 0), 0.15 to 0.25% of N, 0.004 to 0.06% of B, and the remainder being Fe and inevitable impurities.