公开(公告)号：US20240026504A1

公开(公告)日：2024-01-25

申请号：US18267435

申请日：2021-12-01

Applicant: POSCO

Inventor： Jae-Hoon LEE ,  Sang-Ho HAN

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

CPC classification number: C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/002 ,  C21D8/0236 ,  C21D8/0273 ,  C21D8/0226 ,  C21D8/0278 ,  C21D9/46 ,  C21D2211/008 ,  C21D2211/001 ,  C21D2211/002

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：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：US20230052872A1

公开(公告)日：2023-02-16

申请号：US17785870

申请日：2020-11-24

Applicant: POSCO

Inventor： Jae-Hoon LEE ,  Sang-Ho HAN

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

Abstract: Provided is a steel sheet which can be used for automobile parts and the like, and relates to a steel sheet having a superior balance of strength and ductility and strength and a hole expansion ratio and superior bending formability, and a method for manufacturing same.

公开(公告)号：US20200063233A1

公开(公告)日：2020-02-27

申请号：US16466714

申请日：2017-11-08

Applicant: POSCO

Inventor： Sang-Ho HAN ,  Je-Woong LEE

IPC: C21D9/46 ,  B32B15/01 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C22C38/38 ,  C22C38/22 ,  C22C38/32 ,  C22C38/02 ,  C22C38/06 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00

Abstract: Provided is a hot-dip galvanized steel plate which is applicable as a material for a vehicle outer panel and has an excellent bake hardenability and anti-aging property at room temperature, and a method for manufacturing a hot-dip galvanized steel plate, the method comprising a process including the steps of: winding a hot-rolled steel plate, followed by cooling at a speed of 0.002-0.027° C./sec; cold-rolling the cooled steel plate; continuously annealing the cold-rolled steel plate; and cooling the annealed steel plate in the multi-stage manner of primary to third rounds.

公开(公告)号：US20230295763A1

公开(公告)日：2023-09-21

申请号：US18022958

申请日：2021-09-07

Applicant: POSCO

Inventor： Sung-Kyu KIM ,  Kyoung-Rae CHO ,  Chang-Hyo SEO ,  Ki-Hyun PARK ,  Sang-Ho HAN

IPC: C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/38 ,  C22C38/28 ,  C22C38/26 ,  C22C38/02 ,  C22C38/00

CPC classification number: C21D9/46 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C22C38/38 ,  C22C38/28 ,  C22C38/26 ,  C22C38/02 ,  C22C38/002 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/002

Abstract: Provided is a high-strength steel sheet and a method for manufacturing same, wherein the high-strength steel sheet is a material suitable for automobile structural members and has excellent moldability, such as hole expandability, through the improvement of ductility, while having a low yield ratio and high strength.

公开(公告)号：US20210292862A1

公开(公告)日：2021-09-23

申请号：US17339619

申请日：2021-06-04

Applicant: POSCO

Inventor： Seong-Ho HAN ,  Sang-Ho HAN

IPC: C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/38 ,  C22C38/60 ,  C21D9/46 ,  C21D8/04 ,  C22C38/06 ,  C23C2/40

Abstract: A high-strength cold-rolled steel sheet and a hot-dipped galvanized steel sheet with low deviation of material properties and excellent formability, and a method for manufacturing same are provided. The present invention relates to a low-yield-ratio high-strength cold-rolled steel sheet with low deviation of directional material and excellent formability, comprising 0.05-0.15 wt % of C, 0.2-1.5 wt % of Si, 2.2-3.0 wt % of Mn, 0.001-0.10 wt % of P, 0.010 wt % or less of S, 0.01-0.10 wt % of sol.Al, 0.010 wt % or less of N, and the balance of Fe and impurities, satisfying Si/(Mn+Si)≤0.5, wherein the microstructure of the steel sheet includes 40% or more of ferrite, 10% or less of bainite, 3% or less of residual austenite, and a balance of martensite, and the area fraction of a Mn band present in the martensite phase is 5% or less.

公开(公告)号：US20180142318A1

公开(公告)日：2018-05-24

申请号：US15579406

申请日：2016-06-07

Applicant: POSCO

Inventor： Sang-Ho HAN

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

Abstract: A high-strength thin steel sheet having excellent drawability and bake hardenability, and a method of manufacturing the same are provided. The high-strength thin steel sheet includes 0.0005 to 0.003 wt % of carbon (C); 0.5 wt % or less (excluding 0 wt %) of silicon (Si); 1.2 wt % or less (excluding 0 wt %) of manganese (Mn); 0.005 to 0.12 wt % of phosphorous (P); 0.008 wt % or less of sulfur (S); 0.005 wt % or less of nitrogen (N); 0.1 wt % or less (excluding 0 wt %) of acid-soluable aluminum (Al); 0.01 to 0.04 wt % of titanium (Ti); iron (Fe) as a remainder thereof; and unavoidable impurities. The high-strength thin steel sheet has BH of 4 MPa or more and P of 80% or more in Equation 1: P (%)={Nin/(Nin+Ngb)}×100, Nin being the number of carbides having a size of 20 nm or less within a crystal grain, and Ngb being the number of carbides having a size of 20 nm or less at a grain boundary.

公开(公告)号：US20180002771A1

公开(公告)日：2018-01-04

申请号：US15537743

申请日：2015-05-08

Applicant: POSCO

Inventor： Seong-Ho HAN ,  Sang-Ho HAN

IPC: C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C23C2/40 ,  C22C38/06

CPC classification number: C21D8/0236 ,  C21D8/02 ,  C21D8/0226 ,  C21D8/0273 ,  C21D8/0436 ,  C21D8/0473 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/38 ,  C22C38/60 ,  C23C2/40

Abstract: A high-strength cold-rolled steel sheet and a hot-dipped galvanized steel sheet with low deviation of material properties and excellent formability, and a method for manufacturing same are provided. The present invention relates to a low-yield-ratio high-strength cold-rolled steel sheet with low deviation of directional material and excellent formability, comprising 0.05-0.15 wt % of C, 0.2-1.5 wt % of Si, 2.2-3.0 wt % of Mn, 0.001-0.10 wt % of P, 0.010 wt % or less of S, 0.01-0.10 wt % of sol.Al, 0.010 wt % or less of N, and the balance of Fe and impurities, satisfying Si/(Mn+Si)≦0.5, wherein the microstructure of the steel sheet includes 40% or more of ferrite, 10% or less of bainite, 3% or less of residual austenite, and a balance of martensite, and the area fraction of a Mn band present in the martensite phase is 5% or less.

公开(公告)号：US20230092345A1

公开(公告)日：2023-03-23

申请号：US17992245

申请日：2022-11-22

Applicant: POSCO Co., Ltd

Inventor： Sang-Ho HAN ,  Je-Woong LEE

IPC: C22C38/04 ,  C22C38/18 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: Provided is a steel sheet by weight percentage (wt %), carbon (C): 0.005 to 0.08%, manganese (Mn): 1.25% or less (excluding 0%), phosphorus (P): 0.03% or less (excluding 0%), sulfur (S): 0.01% or less (excluding 0%), nitrogen (N): 0.01% or less (excluding 0%), soluble aluminum (sol.Al): 0.01 to 0.06%, chromium (Cr): 1.15 to 2.5%, antimony (Sb): 0.1% or less (excluding 0%), at least one selected from the group consisting of nickel (Ni): 0.3% or less (excluding 0%), silicon (Si): 0.3% or less (excluding 0%), molybdenum (Mo): 0.2% or less (excluding 0%), and boron (B): 0.003% or less (excluding 0%), and a remainder of iron (Fe) and other unavoidable impurities, satisfying Expression 1: 1.3≤Mn(wt %)+Cr(wt %)/1.5+Sb(wt %)≤2.7, where Mn, Cr, and Sb refer to contents (wt %) of corresponding elements, respectively; and 1 to 5% of martensite and a remainder of ferrite by an area percentage (area %).

公开(公告)号：US20200340086A1

公开(公告)日：2020-10-29

申请号：US16956247

申请日：2018-11-30

Applicant: POSCO

Inventor： Sang-Ho HAN ,  Je-Woong LEE

IPC: C22C38/04 ,  C23C2/28 ,  C23C2/06 ,  C23C2/40 ,  C22C38/18

Abstract: Provided is a steel sheet used as a material for an automotive exterior panel, etc., and a method for manufacturing the same. More particularly, provided is a cold-rolled steel sheet and a hot-dip galvanized steel sheet, which have excellent bake hardening properties, corrosion resistance, and anti-aging properties, and a method for manufacturing the same.