公开(公告)号：US20240026511A1

公开(公告)日：2024-01-25

申请号：US18265412

申请日：2021-12-09

Applicant: POSCO CO., LTD

Inventor： Yu-Mi HA ,  Jun-Sung YEOM ,  Ji-Ho HONG

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

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

Abstract: Provided is a galvannealed steel sheet having excellent powdering resistance, and a manufacturing method therefor. The galvannealed steel sheet includes: base iron; and an alloying hot-dip galvanized layer provided on the surface thereof. The base iron includes, by weight %; 0.003 to 0.009% of carbon (C); 0.05% or less of silicon (Si); 0.4 to 1.0% of manganese (Mn); 0.04 to 0.09% 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); 0.05 to 0.08% of molybdenum (Mo); 0.005 to 0.03% of titanium (Ti); 0.02 to 0.045% of niobium (Nb); 0.06 to 0.1% of copper (Cu); 0.0015% or less of boron (B), and a balance of Fe and inevitable impurities. An average thickness of a gamma (γ) phase present at an interface between the base iron and the alloying hot-dip galvanized layer is 0.20 μm or less.

公开(公告)号：US20240026489A1

公开(公告)日：2024-01-25

申请号：US18268518

申请日：2021-12-16

Applicant: POSCO Co., Ltd

Inventor： Jaehoon Kim ,  Suyong Shin ,  Jooyoung Koo ,  Seungil Kim

IPC: C21D9/46 ,  C22C38/34 ,  C22C38/02 ,  C22C38/04 ,  C21D8/12 ,  C21D6/00 ,  C21D1/18 ,  C21D1/84

CPC classification number: C21D9/46 ,  C22C38/34 ,  C22C38/02 ,  C22C38/04 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1277 ,  C21D6/008 ,  C21D6/005 ,  C21D1/18 ,  C21D1/84 ,  C22C2202/02

Abstract: A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes, by wt %: 2.5 to 3.8% of Si, 0.1 to 1.5% of Al, 0.1 to 2.0% of Mn, 0.01 to 0.15% of Cr, and a balance of Fe and inevitable impurities, wherein the non-oriented electrical steel sheet satisfies the following Expression 1.


[Cr]>([Al]+[Mn])/[Si]/10  [Expression 1]

(In Expression 1, [Cr], [Al], [Mn], and [Si] represent contents (wt %) of Cr, Al, Mn, and Si, respectively.)

公开(公告)号：US20240026488A1

公开(公告)日：2024-01-25

申请号：US18266483

申请日：2021-12-21

Applicant: POSCO Co., Ltd.

Inventor： Ki-Cheol Kang ,  Yong-Joo Kim ,  Tae-Chul Kim ,  Myung-Soo Kim ,  Jong-Sang Kim

IPC: C21D9/46 ,  C22C38/60 ,  C22C38/38 ,  C22C38/34 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/74 ,  B32B15/01 ,  C23C2/02 ,  C23C2/40

CPC classification number: C21D9/46 ,  C22C38/60 ,  C22C38/38 ,  C22C38/34 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/002 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D8/0278 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D1/74 ,  B32B15/013 ,  C23C2/02 ,  C23C2/40

Abstract: The present invention relates to a high-strength hot-dipped galvanized steel sheet having excellent surface quality and spot weldability and a method for manufacturing same. The hot-dipped galvanized steel sheet according to one aspect of the present invention comprises a base steel sheet and a hot-dipped galvanized layer formed on the surface of the base steel sheet, in which an inhibiting layer made of an Fe—Al alloy can be formed at an area ratio of 60% or more between the base steel sheet and the hot-dipped galvanized layer.

公开(公告)号：US20240026483A1

公开(公告)日：2024-01-25

申请号：US18265246

申请日：2021-11-15

Applicant: POSCO CO., LTD

Inventor： Kang-Hyun CHOI ,  Yeon-Sang AHN ,  Joo-Hyun RYU

IPC: C21D9/46 ,  C22C38/60 ,  C22C38/38 ,  C22C38/32 ,  C22C38/26 ,  C22C38/22 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D1/18 ,  C21D1/84 ,  C21D6/00 ,  C23C2/28

CPC classification number: C21D9/46 ,  C22C38/60 ,  C22C38/38 ,  C22C38/32 ,  C22C38/26 ,  C22C38/22 ,  C22C38/06 ,  C22C38/02 ,  C22C38/002 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C21D1/18 ,  C21D1/84 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C23C2/29 ,  C23C2/28 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/001

Abstract: Provided is a high-strength hot-dip galvanized steel sheet having excellent ductility and formability. The hot-dip galvanized steel sheet contains, by wt %, 0.06 to 0.16% of carbon (C), 0.8% or less (excluding 0%) of silicon (Si), 2.1 to 2.7% of manganese (Mn), 0.4% or less (excluding 0%) of molybdenum (Mo), 1% or less (excluding 0%) of chromium (Cr), 0.1% or less (excluding 0%) of phosphorus (P), 0.02% or less of sulfur (S), 1% or less (excluding 0%) of aluminum (sol.Al), 0.001 to 0.04% of titanium (Ti), 0.001 to 0.04% of niobium (Nb), 0.01% or less (excluding 0%) of nitrogen (N), 0.01% or less of boron (B), 0.05% or less of antimony (Sb), and a balance of Fe and unavoidable impurities.

公开(公告)号：US20240018619A1

公开(公告)日：2024-01-18

申请号：US18265108

申请日：2021-12-03

Applicant: POSCO Co., Ltd

Inventor： Hong-Seok Yang ,  Jun-Hak Pak ,  Seok-Jong Seo

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

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

Abstract: 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：US20240011138A1

公开(公告)日：2024-01-11

申请号：US18032977

申请日：2021-12-17

Applicant: POSCO CO., LTD

Inventor： Sang-Ho UHM ,  Jin-Keun OH

IPC: C23C2/28 ,  C21D9/50 ,  C23C2/12 ,  C23C2/40

CPC classification number: C23C2/28 ,  C21D9/50 ,  C23C2/12 ,  C23C2/40

Abstract: An embodiment of the present invention provides a method for manufacturing a tailor welded blank using a steel sheet for hot pressing having an Al-Fe-based intermetallic alloy layer, the method comprising the steps of: preparing a plated steel sheet having a base steel sheet and an aluminum-based plated layer formed on one surface or both surfaces of the base steel sheet; heat-treating the plated steel sheet so that the aluminum-based plated layer becomes an Al-Fe-based intermetallic alloy layer; and subjecting the heat-treated plated steel sheet to butt welding, wherein, before the welding, a part or the entirety of the Al-Fe-based intermetallic alloy layer located in an area to be welded is removed.

公开(公告)号：US20240011116A1

公开(公告)日：2024-01-11

申请号：US18035925

申请日：2021-11-03

Applicant: POSCO CO., LTD

Inventor： Sang-Hyun KIM ,  Seong-Ho HAN ,  Chung-Won KIM ,  Yu-Mi HA

IPC: C21D9/46 ,  C22C38/32 ,  C22C38/26 ,  C22C38/22 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/18 ,  C23C2/02 ,  C23C2/26

CPC classification number: C21D9/46 ,  C22C38/32 ,  C22C38/26 ,  C22C38/22 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/004 ,  C22C38/002 ,  C22C38/001 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D1/18 ,  C23C2/0224 ,  C23C2/26 ,  C21D2211/005

Abstract: Provided are a bake-hardened hot-dip galvanized steel sheet with excellent powdering resistance, and a manufacturing method therefor. The bake-hardened hot-dip galvanized steel sheet comprises, by wt %, 0.0001-0.005% of carbon (C), 0.1-1.2% of manganese (Mn), 0.02% or less of silicon (Si) (excluding 0%), 0.01-0.04% of phosphorus (P), 0.01% or less of sulfur (S) (excluding 0%), 0.01% or less of nitrogen (N) (excluding 0%), 0.01-0.06% of aluminum (sol.Al), 0.003-0.015% of niobium (Nb), 0.0005-0.0035% of boron (B), 0.01-0.1% of chromium (Cr), 0.005-0.05% of molybdenum (Mo), 0.003% or less of titanium (Ti) (excluding 0%), and the balance of Fe and inevitable impurities, and satisfies relationships 1 and 2, wherein the microstructure thereof is ferrite single phase and satisfies relationship 3.

公开(公告)号：US20230420698A1

公开(公告)日：2023-12-28

申请号：US18038396

申请日：2021-11-17

Applicant: POSCO Co., Ltd

Inventor： Youngjun Kim ,  Dong-hoon Kim ,  Bo-sung Seo

IPC: H01M8/021 ,  C25F1/06 ,  C21D1/76 ,  C21D1/26

CPC classification number: H01M8/021 ,  C25F1/06 ,  C21D1/76 ,  C21D1/26 ,  C21D2211/001

Abstract: Disclosed is an austenitic stainless steel for a fuel cell separator with improved contact resistance. The austenitic stainless steel for a fuel cell separator with improved contact resistance according to an embodiment of the present disclosure includes, in percent by weight (wt %), at most of C (excluding 0), at most 3.0% of Si (excluding 0), at most 3.0% of Mn (excluding 0), 20 to 30% of Cr, 8 to 20% of Ni, at most 0.003% of S, at most 0.03% of P, at most 0.6% of Mo (excluding 0), at most 0.8% of Cu (excluding 0), 0.1 to 0.3% of N, at most 2.0% of W (excluding and the remainder being Fe and other inevitable impurities.

公开(公告)号：US20230420697A1

公开(公告)日：2023-12-28

申请号：US18038389

申请日：2021-11-18

Applicant: POSCO Co., Ltd

Inventor： Jong-hee Kim ,  Kyuwan Lim ,  Bo-sung Seo ,  Kwangmin Kim ,  Young-hwan Kim

IPC: H01M8/021 ,  H01M8/0228

CPC classification number: H01M8/021 ,  H01M8/0228

Abstract: Disclosed is a stainless steel for a fuel cell separator having excellent surface hydrophilicity and electrical conductivity. According to an embodiment of a stainless steel for a fuel cell separator having excellent surface hydrophilicity and electrical conductivity, the surface oxide element ratio (1) value below may be 0.2 or more and the contact angle may be 80° or less as measured for the surface of a stainless steel containing 15 wt % or more of Cr by X-ray angle-resolved photoemission spectroscopy using an Al-Kα X-ray source under the condition where a take-off angle of photoelectrons is from 120 to 85°.











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The Cr oxide represents Cr3O4, Cr2O3, CrO2, or CrO3, and the Cr hydroxide represents CrOOH, Cr(OH)2, or Cr(OH)3. The entire oxides and hydroxides include the Cr oxide, the Cr hydroxide, an Fe oxide, an Fe hydroxide, and a metal oxide (MO), wherein the metal oxide (MO) includes a mixed oxide, M represents an alloying element contained in a matrix other than Cr and Fe, or a combination thereof, and O represents oxygen.

公开(公告)号：US20230416890A1

公开(公告)日：2023-12-28

申请号：US18038096

申请日：2021-11-17

Applicant: POSCO CO., LTD

Inventor： Tae-Il SO ,  Sang-Deok KANG

IPC: C22C38/58 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C21D8/02

CPC classification number: C22C38/58 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C21D8/0263 ,  C21D8/0226 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/002

Abstract: The present invention is to provide a steel material having low surface hardness and excellent low temperature impact toughness, and a method for manufacturing same.