公开(公告)号：US20230416861A1

公开(公告)日：2023-12-28

申请号：US18037468

申请日：2021-11-18

Applicant: POSCO Co., Ltd

Inventor： Jun-Hak Pak ,  Hong-Seok Yang ,  Hak-Jun Kim ,  Seok-Jong Seo

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/18 ,  C21D1/84

CPC classification number: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D6/005 ,  C21D6/008 ,  C21D1/18 ,  C21D1/84 ,  C21D2211/009 ,  C21D2211/005

Abstract: Provided are a hot rolled steel having small compressive strength loss after being processed into a steel pipe, and a manufacturing method therefor. The hot rolled steel of the present invention comprises, by wt %, 0.15% or less of carbon (C), 2.5% or less of silicon (Si), 2.0% or less of manganese (Mn), 0.05% or less of aluminum (Al), nitrogen (N) and boron (B) in a sum of 0.002 to 0.008%, and a balance of Fe and inevitable impurities, wherein 250

公开(公告)号：US20240018618A1

公开(公告)日：2024-01-18

申请号：US18039933

申请日：2021-12-03

Applicant: POSCO Co., Ltd

Inventor： Hong-Seok Yang ,  Hak-Jun Kim ,  Han-Sung Kim ,  Seung-Min La ,  Woo-Yeon Cho

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

CPC classification number: C21D9/46 ,  C22C38/12 ,  C22C38/04 ,  C22C38/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D6/005 ,  C21D6/008 ,  C21D2211/005 ,  C21D2211/009

Abstract: According to one aspect of the present invention, a hot-rolled steel sheet and a manufacturing method for same may be provided, wherein the hot-rolled steel sheet has excellent yield strength, vibration damping ratio, electrical resistivity, and low-temperature toughness, and thus has properties suitable for use in a hyper train tube.