公开(公告)号：US20230416885A1

公开(公告)日：2023-12-28

申请号：US18034951

申请日：2021-08-26

Applicant: POSCO CO., LTD.

Inventor： Jieon Park ,  Jong-su Paek

IPC: C22C38/28 ,  C22C38/02 ,  C22C38/00 ,  C21D6/00 ,  C21D8/02 ,  C21D9/00

CPC classification number: C22C38/28 ,  C22C38/02 ,  C22C38/001 ,  C22C38/004 ,  C21D6/002 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/021 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D9/0081 ,  C21D2211/005

Abstract: Disclosed is a ferritic stainless steel with improved strength, workability, and corrosion resistance, which may be applied to various industrial fields, such as washing machines, refrigerators, and all kinds of electric home appliances. An embodiment of the disclosed ferritic stainless steel comprises, in percent by weight (wt %), 0.0005 to 0.02% of C, 0.005 to 0.02% of N, 0.7 to 1.0% of Si, 16.0 to 17.0% of Cr, 0.05 to 0.3% of Ti, and the balance being Fe and inevitable impurities, wherein the ferritic stainless steel has a value of Formula (1) below satisfying 21 to 25, a tensile strength of 470 MPa or more, and an elongation of 27% or more.


7*Si+Cr  (1)

In Formula (1), Si and Cr represent the contents (wt %) of the respective elements.

公开(公告)号：US20230416857A1

公开(公告)日：2023-12-28

申请号：US18038757

申请日：2021-12-01

Applicant: POSCO Co., Ltd

Inventor： Jae-Young CHO ,  Sang-Deok KANG

IPC: C21D9/00 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  E04H9/02

CPC classification number: C21D9/0081 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/004 ,  C22C38/002 ,  C22C38/001 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/0278 ,  C21D6/005 ,  C21D6/008 ,  E04H9/021 ,  C21D2211/005

Abstract: The present invention provides a steel material for a seismic damper, and a manufacturing method for same. The steel material comprises, in wt %, at most 0.006% of C, at most 0.05% of Si, at most 0.3% of Mn, at most 0.02% of P, at most 0.01% of S, 0.005 to 0.05% of Al, at most 0.005% of N, 48/14×[N] to 0.05% of Ti (here, [N] is the nitrogen content in wt %), 0.04 to 0.15% of Nb, and the remainder in Fe and other unavoidable impurities, and has a ferrite single structure, and has a ferrite grain average particle size of 150 to 500 μm in a region of a surface layer part, corresponding to 30% of the total thickness from the surface thereof.

公开(公告)号：US20230416855A1

公开(公告)日：2023-12-28

申请号：US18037270

申请日：2021-11-10

Applicant: POSCO Co., Ltd

Inventor： Kyong-Su Park ,  Chang-Young Son

IPC: C21D8/02 ,  C21D9/46 ,  C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/00 ,  C22C38/14 ,  C22C38/12 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40 ,  C23C4/06 ,  C25D3/22 ,  C25D3/44

CPC classification number: C21D8/0226 ,  C21D9/46 ,  C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/002 ,  C22C38/14 ,  C22C38/12 ,  C21D8/0263 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40 ,  C23C4/06 ,  C25D3/22 ,  C25D3/44 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/009 ,  C21D2211/008 ,  C21D2211/001

Abstract: A hot-rolled steel sheet comprises, by wt %, 0.1-0.25% of carbon (C), 0.2-2.0% of manganese (Mn), 0.3% or less of silicon (Si), 0.05% or less of aluminum (Al), 0.05% or less of phosphorous (P), 0.03% or less of sulfur (S), 0.01% or less of nitrogen (N), 0.005 to 0.05% of titanium (Ti), 0.0005 to 0.005% of boron (B), 0.01% or less of niobium (Nb), 0.1% or less of molybdenum (Mo), 0.1% or less of vanadium (V), and the balance of iron (Fe) and inevitable impurities, comprises, in a microstructure, 55-90% of bainite and 10-45% of ferrite by volume fraction, the number per unit area of carbides having a major axis length of 25-500 nm from among carbides present in the bainite is 3*106/mm2 or more, and the average aspect ratio (major axis/minor axis) of the carbides present in the bainite can be 2.0 or less.

公开(公告)号：US20230407433A1

公开(公告)日：2023-12-21

申请号：US18240081

申请日：2023-08-30

Applicant: POSCO CO., LTD

Inventor： Kwan-Ho Kim

IPC: C21D9/52 ,  C21D6/00 ,  C21D8/06 ,  C22C38/00 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/26 ,  C22C38/24

CPC classification number: C21D9/525 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/065 ,  C22C38/001 ,  C22C38/002 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/26 ,  C22C38/24 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/04

Abstract: An embodiment of the present invention provides a wire rod and a steel wire which are for springs and have excellent corrosion fatigue resistance properties, and a method for producing same, the wire rod and steel wire containing, in wt %, 0.40-0.70% of C, 1.20-2.30% of Si, 0.20-0.80% of Mn, 0.20-0.80% of Cr, 0.015% or less of P, 0.015% or less of S, and 0.010% or less of N, with the remainder comprising Fe and other unavoidable impurities, along with at least one among 0.01-0.20% of V and 0.01-0.10% of Nb, wherein the V and Nb satisfy relational expression 1 below, the average grain size of prior austenite is no greater than 20 μm, and the surface decarburization depth is no greater than 0.1 mm. [Relational expression 1] [V]+[Nb]≥0.08 (where the V and Nb contents are in wt %)

公开(公告)号：US20230357878A1

公开(公告)日：2023-11-09

申请号：US18017481

申请日：2021-07-20

Applicant: POSCO Co., Ltd

Inventor： Hyun-Je Sung

IPC: C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/44 ,  C22C38/42 ,  C22C38/48 ,  C22C38/54 ,  C22C38/06 ,  C21D8/02

CPC classification number: C21D9/46 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/44 ,  C22C38/42 ,  C22C38/48 ,  C22C38/54 ,  C22C38/06 ,  C21D8/0226 ,  C21D8/0273 ,  C21D8/0205 ,  C21D2211/008

Abstract: The objective of the present invention is to provide a steel material having improved hydrogen embrittlement resistance and high impact toughness despite a low-cost alloy system compared to conventional steel, which can be advantageously applicable in the field using hydrogen which is gradually increasing, and a method for manufacturing same.

公开(公告)号：US20230340633A1

公开(公告)日：2023-10-26

申请号：US18341672

申请日：2023-06-26

Applicant: POSCO CO., LTD

Inventor： Young-Roc IM ,  Jong-Chan PARK ,  Jai-Hyun KWAK ,  Min-Seo KOO

IPC: C21D9/46 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/06 ,  C23C2/40

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/06 ,  C23C2/40 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008

Abstract: Provided is a method of manufacturing a high-strength cold rolled steel sheet. The method includes: preparing a slab; heating the slab to 1,150° C. to 1,250° C.; finish hot rolling the heated slab within 900° C. to 980° C.; cooling the slab at an average cooling rate of 10° C./sec to 100° C./sec; winding the slab in 500° C. to 700° C.; cold rolling the slab at a cold-rolling reduction ratio of 30% to 60% to obtain a cold rolled steel sheet; continuously annealing the cold rolled steel sheet at Ae3+30° C. to Ae3+80° C.; primarily cooling the continuously annealed steel sheet at an average cooling rate of 10° C./s or less to 560° C. to 700° C. and secondarily cooling the steel sheet at an average cooling rate of 10° C./s or more to 270° C. to 330° C.; and reheating the cooled steel sheet at a temperature increase rate of 5° C./s or lower to a temperature in a range of 380° C. to 460° C.

公开(公告)号：US20230335848A1

公开(公告)日：2023-10-19

申请号：US18028083

申请日：2021-10-08

Applicant: POSCO Co., Ltd

Inventor： Dong-Yoon Seok ,  Hong-Woo Lee ,  Jae-Hyun Kim

IPC: H01M50/242 ,  H01M50/249 ,  H01M50/244

CPC classification number: H01M50/242 ,  H01M50/249 ,  H01M50/244 ,  H01M2220/20

Abstract: The present invention relates to a battery case capable of minimizing the deformation of a battery by effectively coping with side collisions of an electric vehicle and the like, the battery case comprising: a case body for accommodating a battery cell; and a cover coupled to the case body, wherein the case body comprises: a bottom plate; side frames which are coupled to the bottom plate to surround the battery cell, and which include inner sidewalls and outer sidewalls; a mounting frame coupled to the outer sidewalls of the side frames; and at least one reinforcing material, which is arranged on the bottom plate and has longitudinal both-end portions inserted into the side frames, wherein the end portions of the reinforcing material may come in contact with the mounting frame by penetrating the inner sidewalls and the outer sidewalls of the side frames.

公开(公告)号：US20230235517A1

公开(公告)日：2023-07-27

申请号：US18008565

申请日：2021-06-08

Applicant: POSCO Co., Ltd

Inventor： Woo-Yeon Cho

IPC: E01B25/30 ,  B61B13/08 ,  B61B13/10 ,  B60L13/04

CPC classification number: E01B25/305 ,  B61B13/08 ,  B61B13/10 ,  B60L13/04 ,  E01B2201/10 ,  E01B2201/04

Abstract: A guide tube according to an embodiment of the present invention may comprise: a tube main body member; a rib member arranged in the longitudinal direction of the tube main body member and coupled to the inner surface of the tube main body member; and a rail support member connected to the rib member.

公开(公告)号：US20230235423A1

公开(公告)日：2023-07-27

申请号：US18114387

申请日：2023-02-27

Applicant: POSCO Co., Ltd

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

IPC: 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 classification number: 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

Abstract: 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：US20230167523A1

公开(公告)日：2023-06-01

申请号：US18103718

申请日：2023-01-31

Applicant: POSCO Co., Ltd

Inventor： Hyun-Taek Na ,  Sung-Il Kim

IPC: C21D9/46 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: The hot-rolled coated steel sheet comprising: in wt %, C: 0.05-0.14%, Si: 0.1-1.0%, Mn: 1.0-2.0%, P: 0.001-0.05%, S: 0.001-0.01%, AI: 0.01-0.1%, Cr: 0.005-1.0%, Ti: 0.005-0.13%, Nb: 0.005-0.03%, N: 0.001-0.01%, Fe residues, and other inevitable impurities; a mixed structure of ferrite and bainite as a main phase; and as a remaining structure, one or more selected from the group consisting of martensite, austenite, and phase martensite (MA), wherein a fraction of the ferrite and bainite is 95-99 area % and Equation 1 is satisfied. [Equation 1] FCO{110} +FCO{112} ≥10 where, FCO{110} and FCO{112} , each representing an area fraction occupied by a structure having ac crystal orientation of {110} and {112} .