公开(公告)号：US20210260862A1

公开(公告)日：2021-08-26

申请号：US17260653

申请日：2019-07-08

申请人： POSCO

发明人： Tae-Jin SONG ,  Min-Seo KOO

IPC分类号： B32B38/00 ,  B23K20/04 ,  B32B15/18 ,  C21D8/02 ,  B32B15/01

摘要： Provided is a low-density clad steel sheet having excellent formability and fatigue properties, including a base material; and cladding materials provided on both side surfaces of the base material, wherein the base material is a lightweight steel sheet including, by weight, C: 0.3 to 1.0%, Mn: 4.0 to 16.0%, Al: 4.5 to 9.0%, and a remainder of Fe and inevitable impurities, and each of the cladding materials is martensitic carbon steel including, by weight, C: 0.1 to 0.45%, Mn: 1.0 to 3.0%, and a remainder of Fe and inevitable impurities.

公开(公告)号：US20190382861A1

公开(公告)日：2019-12-19

申请号：US16470808

申请日：2017-12-12

申请人： POSCO

发明人： Tae-Jin SONG ,  Jeong-Eun KIM ,  Chang-Sik CHOI

IPC分类号： C21D8/02 ,  C21D9/46 ,  C22C38/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14

摘要： Provided is a hot rolled steel sheet having excellent formability and fatigue properties comprising, in percentage by weight: 0.3-0.8% of C; 13-25% of Mn; 0.1-1.0% of V; 0.005-2.0% of Si; 0.01-2.5% of Al; 0.03% or less of P; 0.03% or less of S; 0.04% or less (excluding 0%) of N; and the balance being Fe and inevitable impurities, wherein, when viewed in a cross section in the thickness direction, the hot rolled steel sheet comprises, by area fraction, 20-70% of a non-recrystallized structure and 30-80% of a recrystallized structure.

公开(公告)号：US20190153559A1

公开(公告)日：2019-05-23

申请号：US16308668

申请日：2017-06-23

申请人： POSCO

发明人： Tae-Jin SONG ,  Man-Young PARK ,  Won-Tae CHO

IPC分类号： C21D9/46 ,  B32B15/01 ,  C21D8/02 ,  C21D6/00 ,  C22C38/32 ,  C22C38/28 ,  C22C38/22 ,  C22C38/26 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/38

摘要： A clad steel plate, having excellent strength and formability, may include a base material; and a cladding material provided on both side surfaces of the base material, wherein the base material is austenitic high-manganese steel comprising, by weight, 0.3% to 1.4% of C, 12% to 25% of Mn, and a remainder of Fe and inevitable impurities, the cladding material is a martensitic carbon steel comprising, by weight, 0.09% to 0.4% of C, 0.3% to 4.5% of Mn, and a remainder of Fe and inevitable impurities.

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：US20240254585A1

公开(公告)日：2024-08-01

申请号：US18293772

申请日：2022-08-01

申请人： POSCO CO., LTD

发明人： Tae-Jin SONG ,  Won HUR

IPC分类号： C21D9/46 ,  C21D1/18 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/06

CPC分类号： C21D9/46 ,  C21D1/18 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  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 ,  C23C2/06

摘要： Provided are a hot-rolled steel sheet having excellent formability and a manufacturing method therefore. The steel sheet includes: carbon (C): 0.05 to 0.17%, silicon (Si): 0.01 to 1.5%, manganese (Mn): 1.5 to 3.0%, aluminum (Al): 0.01 to 0.1%, chromium (Cr): 2.0% or less (including 0%), molybdenum (Mo): 2.0% or less (including 0%), titanium (Ti): 0.01 to 0.15%, phosphorus (P): 0.001 to 0.05%, sulfur (S): 0.0001 to 0.05%, nitrogen (N): 0.0001 to 0.02%, with a balance of Fe and other unavoidable impurities, satisfies: (1.5×[Si]+1.2×[Cr]+0.7×[Mo]+8.0×[Ti])/[C]>20 where each element refers to a weight content, and a microstructure including 70 to 90% of acicular ferrite or bainitic ferrite by area fraction, as a matrix structure, and one or more second phases among low-temperature bainite, tempered martensite, and MA phase.

公开(公告)号：US20160244857A1

公开(公告)日：2016-08-25

申请号：US15030830

申请日：2013-12-24

申请人： POSCO

发明人： Sung-Kyu KIM ,  Kwang-Geun CHIN ,  Tae-Jin SONG ,  Tai-Ho KIM ,  Won-Tae CHO ,  Sun-Ho JEON

IPC分类号： C21D9/46 ,  C22C38/00 ,  C22C38/14 ,  C22C38/04 ,  C21D8/02 ,  C21D6/00

CPC分类号： C21D9/46 ,  B21B3/00 ,  C21D6/005 ,  C21D8/02 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D2211/001 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14

摘要： The present invention relates to a high-strength and high-manganese steel sheet suitable for an outer panel or a vehicle body of a transport vehicle and, more specifically, to a high-strength and high-manganese steel sheet having excellent vibration-proof properties and a method for producing the same.

摘要翻译： 本发明涉及一种适用于运输车辆的外板或车身的高强度高锰钢板，更具体地说，涉及具有优异的防振性能的高强度高锰钢板 及其制造方法。

公开(公告)号：US20230366053A1

公开(公告)日：2023-11-16

申请号：US18025836

申请日：2021-09-13

申请人： POSCO CO., LTD

发明人： Tae-Jin SONG ,  Sung-Il KIM ,  Chang-Sik CHOI

IPC分类号： C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/60 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/40 ,  C23G1/00 ,  C23C2/06

CPC分类号： C21D8/0226 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/60 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D8/0263 ,  C23C2/40 ,  C23G1/00 ,  C23C2/06 ,  C21D2211/005 ,  C21D2211/001 ,  C21D2211/008 ,  C21D2211/002

摘要： Provided are a hot rolled steel sheet having excellent crashworthiness and a method for manufacturing same. The hot rolled steel sheet of the present invention contains, in weight %, 0.05-0.13% of carbon (C), 0.2-2.0% of silicon (Si), 1.3-3.0% of manganese (Mn), 0.01-0.1% of aluminum (Al), 0.001-0.05% of phosphor (P), 0.001-0.05% of sulfur (S), 0.001-0.02% of nitrogen (N), and the balance being Fe and other inevitable impurities, and has a steel microstructure comprising, in area %, 55% or more of bainitic ferrite, 10% or more of a martensite/austenite composite phase (MA), the sum of the bainitic ferrite and the martensite/austenite composite phase (MA) being 95% or more, and the remaining total being less than 5% of granular ferrite, retained austenite, and carbides.

公开(公告)号：US20230203610A1

公开(公告)日：2023-06-29

申请号：US18171305

申请日：2023-02-17

申请人： POSCO CO., LTD

发明人： Tae-Jin SONG ,  Jeong-Eun KIM ,  Chang-Sik CHOI

IPC分类号： C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/14 ,  C22C38/00 ,  C22C38/12 ,  C22C38/06 ,  C21D9/46

CPC分类号： C21D8/0226 ,  C21D8/0205 ,  C21D8/0215 ,  C21D8/0247 ,  C21D9/46 ,  C22C38/001 ,  C22C38/02 ,  C22C38/002 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C21D2211/001

摘要： Provided is a method of manufacturing a hot rolled steel sheet having excellent formability and fatigue properties, including: preparing a slab including, by weight%, 0.3 to 0.8% of carbon C, 13 to 25% of manganese (Mn), 0.1 to 1.0% of vanadium (V), 0.005 to 2.0% of silicon (Si), 0.01 to 2.5% of aluminum (Al), 0.03% or less of phosphorus (P), 0.03% or less of sulfur (S), 0.04% or less (excluding 0%) of nitrogen (N), and a remainder of iron (Fe) and inevitable impurities; heating the slab to 1050 to 1250° C.; finish rolling, the slab heated in the heating, at a temperature of not lower than a recrystallization temperature of a region having an average V concentration and not higher than a recrystallization temperature of a region having twice the average V concentration, to obtain a hot rolled steel sheet; and coiling the hot-rolled steel sheet at 50 to 700° C.

公开(公告)号：US20210292867A1

公开(公告)日：2021-09-23

申请号：US17263217

申请日：2019-07-25

申请人： POSCO

发明人： Min-Seo KOO ,  Tae-Jin SONG

IPC分类号： C21D9/50 ,  B32B15/01 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

摘要： Provided is a density clad steel sheet having excellent strength and plateability, the clad steel sheet including a base metal, and a clad material provided at both sides of the base metal, wherein the base metal is a ferrite-austenitic duplex lightweight steel sheet comprising, by wt %, 0.3-0.7% of C, 2.0-9.0% of Mn, 4.5-8.0% of Al and the balance of Fe and inevitable impurities, and the clad material is a ferrite carbon steel comprising, by wt %, 0.0005-0.2% of C, 0.05-2.5% of Mn and the balance of Fe and inevitable impurities.

公开(公告)号：US20180371586A1

公开(公告)日：2018-12-27

申请号：US16061134

申请日：2016-12-21

申请人： POSCO

发明人： Won-Tae CHO ,  Tai-Ho KIM ,  Kwang-Geun CHIN ,  Young-Ha KIM ,  Tae-Jin SONG

IPC分类号： C22C38/04 ,  C22C38/14 ,  C22C38/00 ,  C21D6/00

摘要： Provided is a high Mn steel sheet and a manufacturing method therefor, the steel sheet comprising, by wt %: 0-0.1% or less of C; 8-30% of Mn; 0.1% or less of P; 0.02% or less of S; 0.10 or less of N; 0-1.00 of Ti; and Fe and inevitable impurities, wherein a microstructure has epsilon martensite and austenite, and the average particle diameter of the martensite and the austenite is 2 μm or less.