公开(公告)号：US20240042541A1

公开(公告)日：2024-02-08

申请号：US18266777

申请日：2021-12-20

Applicant: POSCO Co., Ltd

Inventor： Young-Hune Kim

IPC: B23K9/23 ,  B23K35/02 ,  B23K35/30 ,  B23K37/00

CPC classification number: B23K9/232 ,  B23K35/0266 ,  B23K35/3053 ,  B23K37/003 ,  B23K2103/166

Abstract: The present invention relates to a welded structural member having excellent corrosion resistance and crack resistance, and a method for manufacturing same.

公开(公告)号：US20240035128A1

公开(公告)日：2024-02-01

申请号：US18268584

申请日：2021-12-17

Applicant: POSCO Co., Ltd

Inventor： Minserk KWON ,  Seonghoon MIN ,  Heonjo CHOI

IPC: C22C38/02 ,  C22C38/00 ,  C22C38/60 ,  C22C38/06 ,  C22C38/04 ,  C21D8/12

CPC classification number: C22C38/02 ,  C22C38/008 ,  C22C38/60 ,  C22C38/06 ,  C22C38/04 ,  C22C38/004 ,  C21D8/1283 ,  C21D2201/05

Abstract: A method for manufacturing a grain-oriented electrical steel sheet, according to one embodiment of the present invention, comprises the steps of: manufacturing a hot rolled sheet by hot rolling a slab comprising, by wt %, 2.5-4.0% of Si, 0.03-0.09% of C, 0.015-0.040% of Al, 0.04-0.15% of Mn, 0.01% or less of S (excluding 0%) and 0.002-0.012% of N, and the balance of Fe and other inevitable impurities; cold rolling the hot rolled sheet to manufacture a cold rolled sheet; performing primary recrystallization annealing on the cold rolled sheet; and performing secondary recrystallization annealing on the cold rolled sheet for which the primary recrystallization annealing has been completed.

公开(公告)号：US20240026484A1

公开(公告)日：2024-01-25

申请号：US18265413

申请日：2021-12-09

Applicant: POSCO CO., LTD

Inventor： Yu-Mi HA ,  Jun-Sung YEOM ,  Sang-Ho HAN ,  Seong-Ho HAN ,  Yong-Hoon CHOI

IPC: C21D9/46 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C23C2/28

CPC classification number: C21D9/46 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/004 ,  C22C38/002 ,  C22C38/001 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C21D6/005 ,  C21D6/008 ,  C23C2/28 ,  C21D2211/005 ,  C23C2/06

Abstract: Provided is a plated steel sheet having excellent surface quality, as well as having excellent formability while also having high strength characteristics; and a method for manufacturing same. The plated steel sheet includes: base iron; and a plating layer provided on at least one surface of the base iron. The base iron includes by weight: 0.002 to 0.01% of carbon (C), 0.1% or less of silicon (Si), 0.4 to 1.0% of manganese (Mn), 0.04 to 0.1% of phosphorus (P), 0.01% or less of sulfur (S), 0.005% or less of nitrogen (N), 0.1% or less of aluminum (S·Al), 0.005 to 0.03% of titanium (Ti), 0.01 to 0.05% of niobium (Nb), 0.06 to 0.1% of copper (Cu), 0.0015% or less of boron (B), a content of molybdenum (Mo). The base iron includes ferrite as a matrix structure.

公开(公告)号：US20240026478A1

公开(公告)日：2024-01-25

申请号：US18265574

申请日：2021-11-24

Applicant: POSCO CO., LTD

Inventor： Dae-Woo KIM

IPC: C21D8/02 ,  C21D6/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/00

CPC classification number: C21D8/0226 ,  C21D8/0263 ,  C21D6/005 ,  C21D6/004 ,  C21D6/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/002 ,  C21D2211/005 ,  C21D2211/009

Abstract: According to an aspect of the present invention, an extremely thick steel plate for steam drum having excellent surface quality and lamellar tear resistance and a manufacturing method therefor may be provided.

公开(公告)号：US20240024985A1

公开(公告)日：2024-01-25

申请号：US18268407

申请日：2021-12-16

Applicant: POSCO Co., Ltd

Inventor： Ohyeoul KWON ,  Woosin KIM ,  Jaehwa SONG

IPC: B23K26/364 ,  B23K26/40

CPC classification number: B23K26/364 ,  B23K26/40 ,  B23K2101/18

Abstract: A grain oriented electrical steel sheet, according to one embodiment of the present invention, comprises: linear grooves formed on one surface or both surfaces of the electrical steel sheet in the direction (X1 direction) crossing a rolling direction; and punctuated grooves formed on one surface or both surfaces of the electrical steel sheet so as to be arranged in the direction (X2 direction) crossing the rolling direction, wherein the plurality of linear grooves and the plurality of punctuated grooves are formed in the rolling direction, and an interval (D3) between the punctuated grooves with respect to an arrangement direction (X2 direction) of the punctuated grooves is 0.02 to 1.7 times the interval (D2) between the punctuated grooves with respect to the rolling direction.

公开(公告)号：US20240024979A1

公开(公告)日：2024-01-25

申请号：US18266198

申请日：2022-06-28

Applicant: POSCO Co., Ltd

Inventor： Mok-Young Lee ,  Du-Youl Choi ,  Sang-Ho Uhm ,  Do-Kyeong Han

IPC: B23K26/00 ,  B23K35/02 ,  B23K35/30

CPC classification number: B23K26/0006 ,  B23K35/0261 ,  B23K35/3073

Abstract: One embodiment of the present invention provides a carbon filament wire for laser welding of a steel sheet having an aluminum-based coating layer, a laser welding method of a steel sheet having an aluminum-based coating layer by using same, and a welded product produced by same, the carbon filament wire comprising: a resin matrix; and two or more carbon filaments provided inside the resin matrix.

公开(公告)号：US20240011141A1

公开(公告)日：2024-01-11

申请号：US18035924

申请日：2021-10-27

Applicant: POSCO CO., LTD

Inventor： Yu-Mi HA ,  Jun-Sung YEOM

IPC: C23C2/40 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/16 ,  C22C38/14 ,  C21D8/02 ,  C23C2/06 ,  C21D9/46

CPC classification number: C23C2/40 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/16 ,  C22C38/14 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C23C2/06 ,  C21D9/46 ,  C21D2211/005

Abstract: Provided are a high-strength hot-dip galvanized steel sheet with excellent formability and a process for producing same. The steel sheet comprises, in mass %: 0.005 to 0.009% of C; 0.05% or less of Si; 0.3 to 0.8% of Mn; 0.06 to 0.09% of P; 0.01% or less of S; 0.005% or less of N; 0.1% or less of Al; 0.05 to 0.08% of Mo; 0.01 to 0.03% of Ti; 0.03 to 0.045% of Nb; 0.06 to 0.1% of Cu; 0.0015% or less of B; and a balance of Fe and inevitable impurities, and 95% or more of ferrite in terms of area fraction. The ferrite has an average grain size of 15 pm or less, with ultrafine grains of 6 pm or less occupying 5 to 10% in a 1 mm×1 mm, and the steel sheet has a surface nanohardness value of 1 to 1.5 GPa.

公开(公告)号：US20240011117A1

公开(公告)日：2024-01-11

申请号：US18267082

申请日：2021-12-01

Applicant: POSCO CO., LTD

Inventor： Jae-Hoon LEE ,  Young-Roc IM

IPC: C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  C21D8/02 ,  C23G1/00

CPC classification number: C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/002 ,  C22C38/001 ,  C21D8/0236 ,  C21D8/0226 ,  C21D8/0273 ,  C23G1/00 ,  C21D2211/002 ,  C21D2211/008 ,  C21D2211/001

Abstract: Provided is a steel sheet that may be used for automobile parts and the like, and to a steel sheet having an excellent balance of strength and ductility, an excellent balance of strength and hole expansion ratio, and an excellent yield ratio evaluation index, and a method for manufacturing the same. The steel sheet includes: by wt %, C: 0.1 to 0.25%, Si: 0.01 to 1.5%, Mn: 1.0 to 4.0%, Al: 0.01 to 1.5%, P: 0.15% or less, S: 0.03% or less, N: 0.03% or less, B: 0.0005 to 0.005%, a balance of Fe, and unavoidable impurities; and as microstructures, bainite, tempered martensite, fresh martensite, retained austenite and unavoidable structures.

公开(公告)号：US20240003032A1

公开(公告)日：2024-01-04

申请号：US18039175

申请日：2021-12-09

Applicant: POSCO Co., Ltd

Inventor： Jin-Ho Jung ,  Won-Hwi Lee ,  Ki-Cheol Kang ,  Seong-Choon Kwon

IPC: C25D3/20 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D6/00 ,  C21D1/74 ,  B32B15/01 ,  C23C2/02 ,  C23F17/00 ,  C25D5/50

CPC classification number: C25D3/20 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/06 ,  C22C38/02 ,  C22C38/002 ,  C21D9/46 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D1/74 ,  B32B15/013 ,  C23C2/026 ,  C23F17/00 ,  C25D5/50

Abstract: In a steel sheet for plating, according to one aspect of the present invention, the CBS profile of an Mn element, which is observed in the direction of surface to depth, sequentially comprises local maximum points and local minimum points, difference of converted concentration of Mn can be 10% or higher, and difference of converted concentration of Si can be 10% or higher.

公开(公告)号：US20230416863A1

公开(公告)日：2023-12-28

申请号：US18242140

申请日：2023-09-05

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 %).