公开(公告)号：US20250043379A1

公开(公告)日：2025-02-06

申请号：US18716475

申请日：2022-12-16

Applicant: POSCO CO., LTD

Inventor： Byoung Ho Lee

IPC: C21D9/46 ,  B32B15/01 ,  C21D8/02 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06

Abstract: A cold-rolled steel sheet, according to one embodiment of the present invention, may comprise in percentage by weight: carbon (C): 0.010-0.025%; manganese (Mn): 0.10-0.25%; sulfur(S): 0.002-0.011%; boron (B): 0.0006-0.0026%; nitrogen (N): 0.0010-0.0034%; aluminum (Al): 0.006-0.028%; and the balance being Fe and unavoidable impurities, and may comprise precipitates of at least one of MnS and BN, wherein the average particle diameter of the precipitates may be 40-250 nm, the area fraction of the precipitates in the cold-rolled steel sheet may be 1-10%, and the yield strength may be 150-220 MPa.

公开(公告)号：US20250038221A1

公开(公告)日：2025-01-30

申请号：US18716496

申请日：2022-12-14

Applicant: POSCO CO., LTD

Inventor： Kwangmin Kim ,  Donghoon Kim ,  Bosung Seo ,  Jonghee Kim

IPC: H01M8/021 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50

Abstract: Provided are a metal material, for a fuel cell separator, having: five or more fine protrusions of 10 to 100 nm on the metal material surface coming into contact with a GDL in a fuel cell; and a real surface length/protrusion-free apparent surface length ratio of 1.15 or more based on a cross-section observed by a transmission electron microscope. The metal material is characterized by having a contact resistance of 10 mΩ·cm2 or less by forming fine protrusions on the surface.

公开(公告)号：US20250034672A1

公开(公告)日：2025-01-30

申请号：US18715902

申请日：2022-12-13

Applicant: POSCO CO., LTD.

Inventor： Sangwoo CHOI ,  Namsuk LIM ,  Sewon PARK

IPC: C21D9/52 ,  C21D1/84 ,  C21D6/00 ,  C21D8/06 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

Abstract: The present disclosure relates to a graphite steel wire rod for TV PEM nut parts, a graphite steel, and a manufacturing and cutting method therefor, and more particularly, to a cutting method for manufacturing industrial parts, a graphite steel wire rod, a graphite steel wire rod, a graphite steel, and a manufacturing method therefor.

公开(公告)号：US20250034671A1

公开(公告)日：2025-01-30

申请号：US18707417

申请日：2022-12-20

Applicant: POSCO CO., LTD

Inventor： Soon-Gi LEE ,  Jong-Kyo CHOI ,  Sang-Deok KANG

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/02 ,  C22C38/58

Abstract: According to one aspect of the present invention, an austenitic high-manganese steel having excellent ultra-low temperature toughness in a weld heat-affected cone, and a manufacturing method therefor can be provided.

公开(公告)号：US20250027182A1

公开(公告)日：2025-01-23

申请号：US18713520

申请日：2022-12-02

Applicant: POSCO CO., LTD

Inventor： Yun-Ik KWON ,  Hak-Jun KIM ,  Kyong-Su PARK ,  Seok-Jong SEO

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14

Abstract: The present invention relates to: a hot rolled steel sheet for ground reinforcement and a steel pipe for ground reinforcement, which have excellent strength and formability; and manufacturing methods thereof. An aspect of the present disclosure is to provide a hot-rolled steel sheet for ground reinforcement and a steel pipe for ground reinforcement, having excellent strength and formability, and manufacturing methods thereof.

公开(公告)号：US12180556B2

公开(公告)日：2024-12-31

申请号：US18025836

申请日：2021-09-13

Applicant: POSCO CO., LTD

Inventor： Tae-Jin Song ,  Sung-Il Kim ,  Chang-Sik Choi

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

Abstract: 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：US20240410030A1

公开(公告)日：2024-12-12

申请号：US18701814

申请日：2022-12-19

Applicant: POSCO CO., LTD

Inventor： Dae-Woo KIM ,  Hong-ju LEE ,  Dae-Woo BAEK

IPC: C21D9/00 ,  C21D1/18 ,  C21D6/00 ,  C21D8/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

Abstract: Provided is an ultrathick steel material for a flange having excellent strength and low temperature impact toughness, and a manufacturing method therefor. The steel material of the present disclosure comprises, in weight %, C: 0.05-0.2%, Si: 0.05-0.5%, Mn: 1.0-2.0%, Al: 0.005-0.1%, P: 0.01% or less, S: 0.015% or less, Nb: 0.005-0.07%, V: 0.001-0.3%, Ti: 0.001-0.05%, Cr: 0.01-0.3%, Mo: 0.01-0.12%, Cu: 0.01-0.6%, Ni: 0.05-4.0%, Ca: 0.0005-0.004%, and the balance being Fe and other unavoidable impurities, wherein the steel material has a microstructure having a prior austenite crystallite grain size of 35 μm or less and including 90 area % or more of at least one of bainite and martensite, and the remainder of ferrite or pearlite.

公开(公告)号：US20240401164A1

公开(公告)日：2024-12-05

申请号：US18694803

申请日：2022-09-21

Applicant: POSCO CO., LTD

Inventor： Kyoung-Rae Cho ,  Sung-Kyu Kim ,  Jun-Ho Park ,  Sang-Ho Han ,  Jeong-Hun Kim

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38

Abstract: The present invention relates to steel suitable as a material for an automotive structural member and particularly, to a high-strength and thick steel sheet having a low yield ratio and high strength, excellent formability and collision resistance due to excellent hole expandability through improved ductility, and a method thereof.

公开(公告)号：US20240368796A1

公开(公告)日：2024-11-07

申请号：US18681653

申请日：2022-09-15

Applicant: POSCO CO., LTD

Inventor： Kang-Min Lee ,  Chung-Hwan Lee ,  Ki-Cheol Kang ,  Nam-A Kim ,  Yoon-Mo Jang

IPC: C25D5/50 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C25D3/12

Abstract: The present invention relates to a high-strength steel sheet having excellent surface quality due to improved coatability thereof and a method for manufacturing same.

公开(公告)号：US20240368720A1

公开(公告)日：2024-11-07

申请号：US18568046

申请日：2022-06-09

Applicant: POSCO CO., LTD

Inventor： Minam Park ,  Sangseok Kim

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/48 ,  C22C38/58

Abstract: Disclosed are a ultrafine austenitic stainless steel simultaneously satisfying a high strength, a high elongation, and a high yield ratio and a method for manufacturing the same. An austenitic stainless steel according to an embodiment of the present disclosure includes, in percent by weight (wt %), 0.005 to 0.03% of carbon (C), 0.1 to 1.0% of silicon (Si), 0.1 to 2.0% of manganese (Mn), 6.0 to 12.0% of nickel (Ni), 16.0 to 20.0% of chromium (Cr), 0.01 to 0.2% of nitrogen (N), 0.25% or less of niobium (Nb), and the balance of iron (Fe) and inevitable impurities, wherein a thickness central region has an average grain size d of 5 μm or less, and a fraction of a unrecrystallized area in a band form is 10% or less.