公开(公告)号：US20240051265A1

公开(公告)日：2024-02-15

申请号：US18373451

申请日：2023-09-27

Applicant: POSCO CO., LTD

Inventor： Seong-Woo KIM ,  Jin-Keun OH ,  Yeol-Rae CHO

IPC: B32B15/01 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/12 ,  C23C2/28 ,  B21D22/02 ,  C21D9/46 ,  C22F1/00 ,  C22F1/04 ,  C21D6/00 ,  C23C2/40 ,  C23F17/00 ,  B21D35/00 ,  C23C26/00 ,  C23C28/02 ,  C23C30/00 ,  C23C28/00 ,  B32B15/18 ,  C23C2/04 ,  B32B15/04 ,  C23C2/26 ,  C23C2/06 ,  C22C30/00 ,  C22C38/14 ,  C22C38/48 ,  C22C38/40 ,  C22C38/18 ,  C22C38/42 ,  C22C38/44 ,  C22C38/08 ,  C22C38/16 ,  C22C38/24 ,  C22C21/00 ,  C22C38/38 ,  C22C38/46 ,  C22C38/20 ,  C22C38/26 ,  C22C38/22 ,  C22C38/58 ,  C22C38/12 ,  C22C38/50 ,  C22C38/54 ,  B21D37/16 ,  B32B5/20 ,  B32B5/18 ,  C21D9/52 ,  C21D1/26 ,  C22C38/60

CPC classification number: B32B15/012 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/12 ,  C23C2/28 ,  B21D22/02 ,  C21D9/46 ,  C22F1/002 ,  C22F1/04 ,  C21D6/005 ,  C21D6/008 ,  C23C2/40 ,  C23F17/00 ,  B21D35/00 ,  C23C26/00 ,  B21D22/022 ,  B21D35/005 ,  B32B15/011 ,  C23C28/023 ,  C23C30/00 ,  C23C28/322 ,  C23C28/321 ,  B32B15/18 ,  C23C2/04 ,  B32B15/043 ,  B32B15/01 ,  B32B15/013 ,  C23C2/26 ,  B32B15/04 ,  C23C2/06 ,  C23C30/005 ,  C22C30/00 ,  C22C38/14 ,  C22C38/48 ,  C22C38/40 ,  C22C38/18 ,  C22C38/42 ,  C22C38/44 ,  C22C38/08 ,  C22C38/16 ,  C22C38/24 ,  C22C21/00 ,  C22C38/38 ,  C22C38/46 ,  C22C38/20 ,  C22C38/26 ,  C22C38/22 ,  C22C38/58 ,  C22C38/12 ,  C22C38/50 ,  C22C38/54 ,  B21D37/16 ,  B32B5/20 ,  B32B5/18 ,  C23C2/29 ,  C21D9/52 ,  C21D1/26 ,  C22C38/008 ,  C22C38/60 ,  Y10T428/12757 ,  Y10T428/12799 ,  Y10T428/12979 ,  Y10T428/12993 ,  Y10T428/12958 ,  Y10T428/12972 ,  Y10T428/12951 ,  Y10T428/12479

Abstract: Provided is a steel sheet for a hot press formed member having excellent resistance to hydrogen delayed fracture, and a method for manufacturing the same. A steel sheet for a hot press formed member comprises: a base steel sheet; an aluminum alloy plating layer on a surface of the base steel sheet; and an oxide layer which is formed on a surface of the plating layer and has a thickness of 0.05 μm or more.

公开(公告)号：US20240051005A1

公开(公告)日：2024-02-15

申请号：US18268138

申请日：2021-12-17

Applicant: POSCO Co., Ltd

Inventor： Hyeon-seok Hwang ,  Kkochnim Oh

IPC: B21D22/02 ,  C23C2/06 ,  C23C2/40 ,  C23C2/28 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00 ,  C22C38/14

CPC classification number: B21D22/022 ,  C23C2/06 ,  C23C2/40 ,  C23C2/28 ,  C22C38/02 ,  C22C38/04 ,  C22C38/002 ,  C22C38/14

Abstract: A plated steel sheet for hot press forming with improved hydrogen delayed fracture properties is disclosed. The disclosed plated steel sheet includes a base steel sheet, and a plating layer formed on a surface of the base steel sheet and including, by weight, Si: 5.0 to 15.0%, Zn: 10.0 to 30.0%, Fe: 4.0 to 12.0%, and the remainder including Al and unavoidable impurities.

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：US20240038423A1

公开(公告)日：2024-02-01

申请号：US18268841

申请日：2021-12-15

Applicant: POSCO Co., Ltd

Inventor： Jaewan Hong ,  Junesoo Park ,  Yongsoo Kim ,  Suyong Shin

IPC: H01F1/147 ,  C22C38/14 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/60 ,  C21D9/46 ,  C21D8/12 ,  C21D6/00

CPC classification number: H01F1/14766 ,  C22C38/14 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/004 ,  C22C38/002 ,  C22C38/60 ,  C22C38/001 ,  C21D9/46 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1272 ,  C21D8/1261 ,  C21D6/005 ,  C21D6/008 ,  C22C2202/02

Abstract: The present invention may provide a non-oriented electrical steel sheet containing, by wt %, 2.10 to 3.80% of Si, 0.001 to 0.600% of Mn, 0.001 to 0.600% of Al, 0.001 to 0.100% of P, 0.0005 to 0.0100% of C, 0.001 to 0.010% of S, 0.0001 to 0.010% of N, 0.0005 to 0.0050% of Ti, 0.001 to 0.080% of Sn, 0.001 to 0.080% of Sb, 0.0005 to 0.0030% of Se, 0.0003 to 0.0010% of Ge, and a balance of Fe and inevitable impurities, the non-oriented electrical steel sheet having excellent iron loss and magnetic flux density and low strength.

公开(公告)号：US20240038422A1

公开(公告)日：2024-02-01

申请号：US18268387

申请日：2021-12-17

Applicant: POSCO Co., Ltd

Inventor： Hunju LEE ,  Yongsoo KIM ,  Suyong SHIN

IPC: H01F1/147 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/12 ,  C21D6/00 ,  C21D1/18 ,  C21D1/74

CPC classification number: H01F1/14766 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/004 ,  C22C38/002 ,  C22C38/001 ,  C21D9/46 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1272 ,  C21D6/005 ,  C21D6/008 ,  C21D1/18 ,  C21D1/74 ,  C22C2202/02

Abstract: A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes 3.3 to 4.0 weight % of Si; 0.4 to 1.5 weight % of Al; 0.2 to 1.0 weight % of Mn; 0.0015 to 0.0040 weight % of C; 0.0005 to 0.0020 weight % of N; 0.0005 to 0.0025 weight % of S; 0.005 to 0.01 weight % of Mo; 0.0005 to 0.0020 weight % of Ti; 0.0005 to 0.0020 weight % of Nb; and 0.0005 to 0.0020 weight % of V, with the remainder including Fe and other unavoidable impurities.

公开(公告)号：US20240026507A1

公开(公告)日：2024-01-25

申请号：US18265167

申请日：2021-10-29

Applicant: POSCO Co., Ltd

Inventor： Soo-ho Park ,  Dong-hoon Kim ,  Jae-seok Park ,  Youngjun Kim

IPC: C22C38/44 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00 ,  C22C38/06 ,  C21D8/02

CPC classification number: C22C38/44 ,  C22C38/02 ,  C22C38/04 ,  C22C38/001 ,  C22C38/06 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/0273 ,  C21D2211/005

Abstract: Disclosed is a ferritic stainless steel with reduced grain boundary erosion. A ferritic stainless steel with reduced grain boundary erosion according to an embodiment includes, in percent by weight (wt %), 0.005 to 0.1% of C, 0.01 to 1.0% of Si, 0.01 to 1.5% of Mn, 13 to 18% of Cr, 0.005 to 0.1% of N, 0.005 to 0.2% of Al, 0.005 to 0.1% of Ni, 0.003% or less of Mo, 0.05% or less of P, 0.005% or less of S, and the remainder being Fe and impurities, and satisfies an Acl, defined by Formula (1) below, of 900 or more and 990 or less:


Ac1=36Cr+90Si+76Mo+760Al+350−(800C+1300N+150Ni+50Mn)  Formula (1):

(wherein C, N, Si, Mn, Cr, Ni, Al, Mn, and Mo represent a content (wt %) of each element).

公开(公告)号：US20240026485A1

公开(公告)日：2024-01-25

申请号：US18265414

申请日：2021-11-22

Applicant: POSCO CO., LTD

Inventor： Kyoung-Rae CHO ,  Hee-Su PARK ,  Hyun-Gyu HWANG ,  Sung-Kyu KIM ,  Chang-Hyo SEO

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

CPC classification number: C21D9/46 ,  C22C38/38 ,  C22C38/02 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/06 ,  C22C38/001 ,  C22C38/002 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D2211/005 ,  C21D2211/002 ,  C21D2211/008 ,  C21D2211/001

Abstract: Provided are a high-strength steel sheet having excellent bendability and formability, and a method for manufacturing same. The steel sheet includes: 0.05 to 0.12% of carbon (C), 2.0 to 3.0% of manganese (Mn), 0.5% or less (excluding 0%) of silicon (Si), 1.0% or less (excluding 0%) of chromium (Cr), 0.1% or less (excluding 0%) of niobium (Nb), 0.1% or less (excluding 0%) of titanium (Ti), 0.0025% or less (excluding 0%) of boron (B), 0.02 to 0.05% of aluminum (sol.Al), 0.05% or less (excluding 0%) of phosphorus (P), 0.01% or less (excluding 0%) of sulfur (S), 0.01% or less (excluding 0%) of nitrogen (N), with a balance of Fe and inevitable impurities, and 35 to 50% of ferrite and 35 to 45% of bainite, and a balance of martensite, the ferrite comprising, by area fraction: 8 to 15% of non-recrystallized ferrite and 27 to 35% of recrystallized ferrite, as a microstructure.

公开(公告)号：US20240018676A1

公开(公告)日：2024-01-18

申请号：US18038914

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 ,  C22C38/22 ,  C22C38/06 ,  C22C38/00 ,  C22C38/02 ,  C21D9/46 ,  C21D1/74 ,  C25D5/50 ,  C23C2/06 ,  C23C28/02

CPC classification number: C25D3/20 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/22 ,  C22C38/06 ,  C22C38/002 ,  C22C38/02 ,  C21D9/46 ,  C21D1/74 ,  C25D5/50 ,  C23C2/06 ,  C23C28/021

Abstract: The steel sheet for plating according to an aspect of the present invention has a GDS profile of an Mn element, as observed in the depth direction from the surface, sequentially including a maximum point and a minimum point, wherein a difference of converted concentration of Mn may be 80% or more, and a difference of converged concentration of Si may be 50% or more.

公开(公告)号：US20240011115A1

公开(公告)日：2024-01-11

申请号：US18035157

申请日：2021-11-04

Applicant: POSCO Co., Ltd

Inventor： Jai-Ik Kim

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/74

CPC classification number: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D6/005 ,  C21D6/008 ,  C21D1/74 ,  C21D2211/003

Abstract: An exemplary embodiment of the present invention provides an enamel steel sheet, including: by wt % (% by weight), 0.01 to 0.05% of C, 0.05 to 0.8% of Mn, 0.001 to 0.03% of Si, 0.03 to 0.12% of Al, 0.001 to 0.02% of P, 0.001 to 0.02% of S, 0.004% or less (excluding 0%) of N, 0.001 to 0.003% of B, 0.003% or less (excluding 0%) of O, and the balance of Fe and inevitable impurities. The enamel steel sheet according to an exemplary embodiment of the present invention includes an oxide layer in an inside direction from a surface, and a thickness of the oxide layer is 0.006 to 0.030 μm.

公开(公告)号：US20240009963A1

公开(公告)日：2024-01-11

申请号：US18372314

申请日：2023-09-25

Applicant: POSCO Co., Ltd.

Inventor： Seong-Woo KIM ,  Jin-Keun OH ,  A-Ra CHO ,  Hyeon-Jeong SHIN

IPC: B32B15/01 ,  C22C38/32 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D6/00 ,  C21D1/84 ,  C22C21/02 ,  C22F1/043 ,  C23C2/12 ,  C23C2/28 ,  B21D22/02

CPC classification number: B32B15/011 ,  C22C38/32 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C21D9/46 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D1/84 ,  C22C21/02 ,  C22F1/043 ,  C23C2/12 ,  C23C2/28 ,  B21D22/02

Abstract: The present invention relates to a hot press formed member. A hot press formed member according to one aspect of the present invention comprises a steel sheet; and a plating layer on the steel sheet, wherein a number of voids per 1000 μm2 of an area from an interface between the plating layer and the steel sheet to 15 μm is zero and wherein a concentration gradient at a section having an Fe content of 45% to 80% in the plating layer in a thickness direction from a surface of the plating layer according to a result of GDS analysis is 7 wt %/μm or less.