公开(公告)号：US20240209467A1

公开(公告)日：2024-06-27

申请号：US18596117

申请日：2024-03-05

Applicant: POSCO CO, LTD

Inventor： Hwan-Goo Seong ,  Yeol-Rae Cho ,  Seong-Beom Bae

IPC: C21D8/02 ,  C21D9/08 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/10 ,  C22C38/12 ,  C22C38/28 ,  C22C38/32 ,  C23G1/00

CPC classification number: C21D8/0226 ,  C21D9/085 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/105 ,  C22C38/12 ,  C22C38/28 ,  C22C38/32 ,  C23G1/00 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009

Abstract: A preferable aspect of the present invention provides: an ultra-high-strength hot-rolled steel sheet containing, by weight, one or two of 0.40-0.60% of C, 0.7-1.5% of Mn, 0.3% or less (excluding 0%) of Si, 0.03% or less (including 0%) of P, 0.004% or less (including 0%) of S, 0.04% or less (excluding 0%) of Al, 0.3% or less (excluding 0%) of Cr, 0.3% or less (excluding 0%) of Mo, 0.9-1.5% of Ni, and 0.9-1.5% of Cu, 1.1% or more of Cu+Ni, 0.04% or less (excluding 0%) of Ti, 0.005% or less (excluding 0%) of B, 0.006% or less (excluding 0%) of N, and the balance Fe and other impurities, the alloy elements satisfying relational formulas 1 and 2 below, wherein a microstructure of the hot-rolled steel sheet comprises, by volume, 7% or more of ferrite and 93% or less of perlite; a steel pipe and a member each using the same; and manufacturing methods therefor. [Relational formula 1] (Mn/Si) #3 (weight ratio) [Relational formula 2] (Ni/Si) #1 (weight ratio)

公开(公告)号：US11338549B2

公开(公告)日：2022-05-24

申请号：US16617823

申请日：2018-05-31

Applicant: POSCO

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

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：US10590522B2

公开(公告)日：2020-03-17

申请号：US16065330

申请日：2016-12-23

Applicant: POSCO

Inventor： Jin-Keun Oh ,  Yeol-Rae Cho ,  Il-Ryoung Sohn ,  Yong-Soo Kim

IPC: C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D9/46 ,  C22C38/58 ,  C22C38/44 ,  C22C38/00 ,  C23C2/26 ,  C23C28/00 ,  C23C2/02 ,  B32B15/01 ,  B32B15/18 ,  B32B15/20 ,  C22C21/00 ,  C22C38/28 ,  C22C38/32 ,  C21D1/673 ,  C21D1/74

Abstract: An Al—Fe alloy coated steel sheet includes a base steel sheet and an alloy coating layer, wherein the base steel sheet includes, by wt %, C: 0.1%˜0.5%, Si: 0.01%˜2%, Mn: 0.01%˜10%, P: 0.001%˜0.05%, S: 0.0001%˜0.02%, Al: 0.001%˜1.0%, N: 0.001%˜0.02%, and the balance of Fe and other impurities, wherein the alloy coating layer includes: an Al—Fe alloy layer I formed on the base steel sheet and having a Vickers hardness of 200˜800 Hv; an Al—Fe alloy layer III formed on the Al—Fe alloy layer I and having a Vickers hardness of 700˜1200 Hv; and an Al—Fe alloy layer II formed in the Al—Fe alloy layer III continuously or discontinuously in a length direction of the steel sheet, and having a Vickers hardness of 400˜900 Hv, wherein an average oxygen content at a depth of 0.1 μm from a surface of the oxide layer is 20% or less by weight.

公开(公告)号：US10151013B2

公开(公告)日：2018-12-11

申请号：US15250079

申请日：2016-08-29

Applicant: POSCO

Inventor： Jin-Keun Oh ,  Yeol-Rae Cho ,  Seong-Woo Kim

IPC: C21D9/46 ,  C23C2/12 ,  C22C38/28 ,  B32B15/01 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/32 ,  C23C2/28 ,  C23C2/40 ,  C22C21/02

Abstract: Provided is an HPF member having excellent bending characteristics and a hot-dip aluminum plated layer formed on a surface of a base steel sheet. The base steel sheet includes, in terms of wt %, 0.18-0.25% of C, 0.1-0.5% of Si, 0.9-1.5% of Mn, 0.03% or less of P, 0.01% or less of S, 0.01-0.05% of Al, 0.05-0.5% of Cr, 0.01-0.05% of Ti, 0.001-0.005% of B, 0.009% or less of N, the balance Fe and other impurities; a ferrite phase having a thickness within 50 μm is continuously or discontinuously formed inside a surface portion of the base steel sheet; the fraction of the surface portion occupied by the ferrite phase is 5% or less; and carbide materials having a size of 1 μm or less are scattered and distributed in the surface portion of the base steel sheet so as to occupy 90% or more of the overall carbide distribution.

公开(公告)号：US09945020B2

公开(公告)日：2018-04-17

申请号：US14703065

申请日：2015-05-04

Applicant: POSCO

Inventor： Il-Ryoung Sohn ,  Jong-Sang Kim ,  Joong-Chul Park ,  Yeol-Rae Cho ,  Jin-Keun Oh ,  Han-Gu Cho ,  Bong-Hoon Chung ,  Jong-Seog Lee

IPC: C23C28/00 ,  C23C14/08 ,  C23C2/06 ,  C23C2/28 ,  C23C2/02 ,  C22C38/00 ,  C22C38/04 ,  C23C8/10

CPC classification number: C23C2/28 ,  C22C38/001 ,  C22C38/04 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40 ,  C23C8/10 ,  Y10T428/12799 ,  Y10T428/12917 ,  Y10T428/12924 ,  Y10T428/12931 ,  Y10T428/12937 ,  Y10T428/12951 ,  Y10T428/12958

Abstract: Provided is a zinc-plated steel sheet for hot pressing having outstanding surface characteristics, comprising: a steel foundation plate comprising a metal surface diffusion layer of which the Gibbs free energy reduction per mole of oxygen during oxidation is less than that of Cr, an aluminum-rich layer containing at least 30 wt. % of aluminum formed on the surface diffusion layer, and a zinc plating layer formed on the aluminum-rich layer. In this way, a metal having a low affinity for oxygen is coated to an effective thickness prior to annealing and thus the creation of annealing oxides at the surface of the steel sheet is suppressed and a uniform zinc plating layer is formed, and alloying of the zinc plating layer is promoted during press-processing heat treatment. Cracking in the steel foundation plate during hot press molding is prevented.

公开(公告)号：US20140308156A1

公开(公告)日：2014-10-16

申请号：US14356300

申请日：2012-11-05

Applicant: POSCO

Inventor： Jin-Keun Oh ,  Kyoo-Young Lee ,  Yeol-Rae Cho ,  Eul-Yong Choi ,  Ki-Soo Kim

IPC: C22C38/38 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  B21B15/00 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B21B1/04 ,  C21D8/02 ,  C22C38/08

CPC classification number: C22C38/38 ,  B21B1/04 ,  B21B15/00 ,  B21B2015/0057 ,  C21D6/005 ,  C21D7/13 ,  C21D8/02 ,  C21D8/0226 ,  C21D8/0463 ,  C21D8/0473 ,  C21D8/0478 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/58 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12

Abstract: Provided are a steel sheet for warm press forming that can have high strength, good elongation, and thus improved crashworthiness after being warm pressed, and a warm-pressed member formed of the steel sheet, and manufacturing methods thereof. The steel sheet for warm press forming includes, by weight %, C: 0.01% to 0.5%, Si: 3.0% or less (excluding 0%), Mn: 3% to 15%, P: 0.0001% to 0.1%, S: 0.0001% to 0.03%, Al: 3.0% or less (excluding 0%), N: 0.03% or less (excluding 0%), and the balance of Fe and inevitable impurities.

Abstract translation: 本发明提供一种能够具有高强度，良好的伸长率，从而提高耐热压制后的耐冲击性的热压成形用钢板，以及由钢板形成的暖压部件及其制造方法。 用于热压成型的钢板包括C：0.01％至0.5％，Si：3.0％或更低（不包括0％），Mn：3％至15％，P：0.0001％至0.1％，S ：0.0001〜0.03％，Al：3.0％以下（不含0％），N：0.03％以下（不含0％），余量由Fe和不可避免的杂质构成。