公开(公告)号：US12049679B2

公开(公告)日：2024-07-30

申请号：US18242140

申请日：2023-09-05

申请人： POSCO Co., Ltd

发明人： Jin-Keun Oh ,  Yeol-Rae Cho ,  A-Ra Cho ,  Jin-Ho Cha ,  Si-Myoung Heo ,  Jeong-Won Seo ,  Seong-Woo Kim

IPC分类号： C21D9/46 ,  B21B3/02 ,  B21D22/02 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/50 ,  C22C38/54

CPC分类号： C21D9/46 ,  B21B3/02 ,  B21D22/022 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/50 ,  C22C38/54 ,  C21D2211/003 ,  C21D2211/005

摘要： An aspect of the present invention relates to a cold-rolled steel plate for hot forming, which is excellent in corrosion-resistance and spot-weldability, contains, by weight %, C: 0.1-0.4%, Si: 0.5-2.0%, Mn: 0.01-4.0%, Al: 0.001-0.4%, P: 0.001-0.05%, S: 0.0001-0.02%, Cr: 0.5% to less than 3.0%, N: 0.001-0.02%, and a balance of Fe and inevitable impurities, satisfying formula (1) below, and includes an Si amorphous oxidation layer continuously or discontinuously formed at a thickness of 1 nm-100 nm on the surface thereof. Formula (1): 1.4≤0.4*Cr+Si≤3.2 (wherein element symbols denote measurements of respective element contents by weight %).

公开(公告)号：US20240149317A1

公开(公告)日：2024-05-09

申请号：US18281496

申请日：2022-02-01

申请人： JFE STEEL CORPORATION

发明人： Noriki FUJITA ,  Takuya KITAMURA ,  Tetsuya ARAKAWA ,  Yoshiki IKOMA ,  Takumi YAMADA

IPC分类号： B21B37/16 ,  B21B3/02

CPC分类号： B21B37/165 ,  B21B3/02

摘要： A cold rolling mill rolling condition setting method using a prediction model being generated with an explanatory variable being first multi-dimensional data obtained by transforming past rolling performance data including pre-cold rolling data of a roll material on an entry side of the cold rolling mill into multi-dimensional data, and an objective variable being post-cold rolling data of the roll material on a delivery side of the cold rolling mill, the method includes: estimating a post-rolling shape of a roll target material by inputting, to the prediction model, second multi-dimensional data generated from information including the pre-cold rolling data of the roll target material on the entry side of the cold rolling mill and a target rolling condition of the cold rolling mill; and changing the target rolling condition of the cold rolling mill such that the estimated post-rolling shape of the roll target material satisfies a predetermined condition.

公开(公告)号：US20240018619A1

公开(公告)日：2024-01-18

申请号：US18265108

申请日：2021-12-03

申请人： POSCO Co., Ltd

发明人： Hong-Seok Yang ,  Jun-Hak Pak ,  Seok-Jong Seo

IPC分类号： C21D9/46 ,  B21B3/02 ,  C22C38/12 ,  C22C38/04 ,  C22C38/02 ,  C21D8/02 ,  C21D6/00

CPC分类号： C21D9/46 ,  B21B3/02 ,  C22C38/12 ,  C22C38/04 ,  C22C38/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D6/005 ,  C21D6/008 ,  C21D2211/005 ,  C21D2211/009

摘要： According to one aspect of the present invention, a hot-rolled steel sheet and a manufacturing method for same may be provided, wherein the hot-rolled steel sheet has excellent yield strength, vibration damping ratio, and low-temperature toughness, and thus has physical properties suitable for use in a hyper train tube.

公开(公告)号：US11827947B2

公开(公告)日：2023-11-28

申请号：US16315767

申请日：2017-07-07

申请人： POSCO

发明人： Jin-Keun Oh ,  Seong-Woo Kim ,  Yeol-Rae Cho ,  Won-Mo Bak

IPC分类号： C21D8/02 ,  B21B3/02 ,  B21B37/74 ,  C21D9/46 ,  C22C38/04 ,  C22C38/20 ,  C22C38/34 ,  C22C38/48

CPC分类号： C21D8/0226 ,  B21B3/02 ,  B21B37/74 ,  C21D8/0236 ,  C21D9/46 ,  C22C38/04 ,  C22C38/20 ,  C22C38/34 ,  C22C38/48 ,  B21B2201/02 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/008

摘要： Provided is a hot press-formed member having excellent crack propagation resistance and ductility. The hot press-formed member includes: a base steel sheet and a zinc or zinc alloy plating layer on at least one surface of the base steel sheet. The base steel sheet contains, by wt %, carbon (C): 0.08-0.30%, silicon (Si): 0.01-2.0%, manganese (Mn): 3.1-8.0%, aluminum (Al): 0.001-0.5%, phosphorus (P): 0.001-0.05%, sulfur (S): 0.0001-0.02%, nitrogen (N): 0.02% or less, and a balance of iron (Fe) and other impurities. The hot press-formed member comprises 1-30 area % of retained austenite as a microstructure, and a Mn(wt %)/Zn(wt %) content ratio in an oxide layer of 0.5-1.2 μm in a thickness direction from a surface layer of the plating layer is 0.1 or more.

公开(公告)号：US20230295785A1

公开(公告)日：2023-09-21

申请号：US18202587

申请日：2023-05-26

申请人： Big River Steel, LLC

发明人： Amar K. De ,  Denis Hennessy ,  Chirag R. Mahimkar

IPC分类号： C22C38/28 ,  C22C38/04 ,  C21D8/02 ,  C22C38/06 ,  B22D11/00 ,  C22C38/26 ,  B21B3/02

CPC分类号： C22C38/28 ,  C22C38/04 ,  C21D8/0226 ,  C22C38/06 ,  B22D11/001 ,  C22C38/26 ,  B21B3/02 ,  C21D6/002

摘要： A method is used to fabricate a hot-rolled steel having a yield strength greater than 550 MPa and an impact toughness of at least 27 J at a temperature of −40° F. In one embodiment, the yield strength is greater than 690 MPa. The method includes melting steel to create melted steel. The melted steel is poured into a mold. The metal steel is continuously cast into a steel slab. The steel slab is heated to maintain a predetermined temperature. The steel slab is rolled to reduce the thickness to a predetermined thickness to create a hot-rolled steel sheet.

公开(公告)号：US20230235423A1

公开(公告)日：2023-07-27

申请号：US18114387

申请日：2023-02-27

申请人： POSCO Co., Ltd

发明人： Jin-Keun OH ,  Yeol-Rae CHO ,  A-Ra CHO ,  Jin-Ho CHA ,  Si-Myoung HEO ,  Jeong-Won SEO ,  Seong-Woo KIM

IPC分类号： C21D9/46 ,  B21B3/02 ,  B21D22/02 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/50 ,  C22C38/54

CPC分类号： C21D9/46 ,  B21B3/02 ,  B21D22/022 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/50 ,  C22C38/54 ,  C21D2211/003 ,  C21D2211/005

摘要： An aspect of the present invention relates to a cold-rolled steel plate for hot forming, which is excellent in corrosion-resistance and spot-weldability, contains, by weight %, C: 0.1-0.4%, Si: 0.5-2.0%, Mn: 0.01-4.0%, Al: 0.001-0.4%, P: 0.001-0.05%, S: 0.0001-0.02%, Cr: 0.5% to less than 3.0%, N: 0.001-0.02%, and a balance of Fe and inevitable impurities, satisfying formula (1) below, and includes an Si amorphous oxidation layer continuously or discontinuously formed at a thickness of 1 nm-100 nm on the surface thereof. Formula (1): 1.4≤0.4*Cr+Si≤3.2 (wherein element symbols denote measurements of respective element contents by weight %).

公开(公告)号：US11441205B2

公开(公告)日：2022-09-13

申请号：US16336645

申请日：2017-09-26

申请人： POSCO

发明人： Jin-Keun Oh ,  Yeol-Rae Cho ,  A-Ra Cho ,  Jin-Ho Cha ,  Si-Myoung Heo ,  Jeong-Won Seo ,  Seong-Woo Kim

IPC分类号： C21D9/46 ,  B21B3/02 ,  B21D22/02 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/50 ,  C22C38/54

摘要： Provided is a cold-rolled steel plate for hot forming, which is excellent in corrosion-resistance and spot-weldability, contains, by weight %, C: 0.1-0.4%, Si: 0.5-2.0%, Mn: 0.01-4.0%, Al: 0.001-0.4%, P: 0.001-0.05%, S: 0.0001-0.02%, Cr: 0.5% to less than 3.0%, N: 0.001-0.02%, and a balance of Fe and inevitable impurities, satisfying formula (1) below, and includes an Si amorphous oxidation layer continuously or discontinuously formed at a thickness of 1 nm-100 nm on the surface thereof. Formula (1): 1.4≤0.4*Cr+Si≤3.2 (wherein element symbols denote measurements of respective element contents by weight %).

公开(公告)号：US20220154303A1

公开(公告)日：2022-05-19

申请号：US17437505

申请日：2020-02-25

申请人： JFE STEEL CORPORATION

发明人： Yuya SATO ,  Shigeki KITSUYA ,  Shusaku OTA ,  Tomoyuki YOKOTA

IPC分类号： C21D9/46 ,  C22C38/22 ,  C22C38/16 ,  C22C38/14 ,  C22C38/10 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  B21B3/02

摘要： An object is to provide a steel plate having excellent deformability in the central portion in the thickness direction and a method for manufacturing the steel plate. A steel plate having a chemical composition containing, by mass %, C: 0.01% to 0.15%, Si: 0.01% to 1.00%, Mn: 0.10% to 2.00%, P: 0.010% or less, S: 0.0050% or less, Al: 0.002% to 0.100%, Ni: 5.0% to 10.0%, N: 0.0010% to 0.0080%, and with a balance being Fe and incidental impurities and a percentage reduction of area of 30% or more in a tensile test in the thickness direction performed on the central portion in the thickness direction.

公开(公告)号：US20220118741A1

公开(公告)日：2022-04-21

申请号：US17425847

申请日：2019-12-26

申请人： JFE Steel Corporation

发明人： Katsutoshi Takashima ,  Minoru Tanaka ,  Kenji Tsuzumi ,  Shingo Arakawa ,  Michitaka Sakurai

IPC分类号： B32B15/01 ,  B21B3/02 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/16 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00

摘要： A hot-pressed member has a predetermined chemical composition. In the hot-pressed member, a steel sheet has a microstructure in which a prior austenite average grain diameter is 8 μm or less, and martensite is present in a volume fraction of 95% or greater in a region within 30 μm of a surface; a Ni diffusion region having a thickness of 0.5 μm or greater exists in a surface layer; a standard deviation of Vickers hardness values is 35 or less; Mndif (mass %) in a sheet thickness direction ≤0.20, where Mndif (mass %) is a degree of Mn segregation; and a tensile strength is 1780 MPa or greater.

公开(公告)号：US20210388460A1

公开(公告)日：2021-12-16

申请号：US17459176

申请日：2021-08-27

申请人： Outokumpu Oyj

发明人： Jörn Teipel ,  Dirk Wiemer ,  Lutz Zoppke ,  Patrick Vogel ,  Andreas Jääger ,  Michael Weg ,  Burkhard Arnold ,  Frank Wörster

IPC分类号： C21D9/46 ,  B21B1/22 ,  B21B3/02 ,  C21D6/00 ,  C21D8/02 ,  C21D1/26

摘要： A method for producing a patterned stainless steel sheet with improved visual characteristics in the wavelength area of visible light including providing a deformed stainless steel sheet; performing a heat treatment on the deformed stainless steel sheet, wherein the heat treatment is conducted at a temperature of 900-1200° C.; performing a mechanical treatment on at least one surface of the heat treated stainless steel sheet; transferring the mechanically treated stainless steel sheet to a patterning process, wherein, in the patterning process, at least one side of the mechanically treated stainless steel sheet is patterned using a patterning roll having a surface with an emboss depth of up to 100 micrometers to provide a patterned stainless steel sheet; and performing a heat treatment on the patterned stainless steel sheet, wherein the heat treatment is conducted at a temperature range of 900-1200° C., wherein the mechanical treatment is carried out by blasting.