公开(公告)号：US20240043952A1

公开(公告)日：2024-02-08

申请号：US18266267

申请日：2021-12-02

Applicant: POSCO CO., LTD

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

IPC: C21D9/46 ,  C22C38/16 ,  C22C38/12 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D1/84 ,  C21D6/00 ,  C22C38/14 ,  C22C38/06 ,  C23C2/06 ,  C23C2/28 ,  B32B15/01

CPC classification number: C21D9/46 ,  C22C38/16 ,  C22C38/12 ,  C22C38/04 ,  C22C38/02 ,  C22C38/004 ,  C22C38/002 ,  C22C38/001 ,  C21D8/0205 ,  C21D8/021 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/0236 ,  C21D8/0278 ,  C21D1/84 ,  C21D6/008 ,  C21D6/005 ,  C22C38/14 ,  C22C38/06 ,  C23C2/06 ,  C23C2/28 ,  B32B15/013 ,  C21D2211/005 ,  C21D2211/009

Abstract: Provided is a plated, ultra-low carbon steel sheet which has excellent strength, formability, and surface properties to allow for the weight lightness of automobiles and a manufacturing method therefor and, more specifically, to a galvanized steel sheet and a manufacturing method therefor, wherein the galvanized steel sheet has high strength and high formability and as such, can be suitably used as a material for an automobile outer body.

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：US20250051889A1

公开(公告)日：2025-02-13

申请号：US18719489

申请日：2022-12-14

Applicant: POSCO CO., LTD

Inventor： Jae-Hoon LEE ,  Seong-Ho HAN ,  Yong-Hoon CHOI

IPC: C22C38/04 ,  C21D6/00 ,  C21D8/02 ,  C21D9/68 ,  C22C38/02 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14

Abstract: The present invention relates to a high-strength steel sheet having excellent formability and a high yield ratio, and a manufacturing method therefor, and more particularly, to a high-strength steel sheet having excellent formability and a high yield ratio, and a manufacturing method therefor, the steel sheet having various uses such as that of vehicle parts.

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.