公开(公告)号：US09869002B2

公开(公告)日：2018-01-16

申请号：US14962424

申请日：2015-12-08

Applicant: POSCO

Inventor： Sung Jin Park ,  Man Jin Ha ,  Dae Sung Lee

IPC: C21C7/06 ,  C21D3/04 ,  C22C38/58 ,  C22C38/42 ,  C22C38/02 ,  C22C38/00 ,  C21C5/00 ,  C21C7/00 ,  C21C7/064 ,  C21C7/068 ,  B22D11/00 ,  B22D11/06

CPC classification number: C21D3/04 ,  B22D11/002 ,  B22D11/0622 ,  C21C5/005 ,  C21C7/0075 ,  C21C7/0087 ,  C21C7/06 ,  C21C7/064 ,  C21C7/0685 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/42 ,  C22C38/58

Abstract: There is provided a method for manufacturing a duplex stainless steel sheet having reduced inclusions through argon oxygen decarburization (AOD), ladle treatment (LT), and twin roll strip casting. The method includes deoxidizing molten steel using silicon (Si) during the AOD, wherein the molten steel has a silicon (Si) content of 0.55 wt % to 0.75 wt % at the end of the AOD.

公开(公告)号：US20220018006A1

公开(公告)日：2022-01-20

申请号：US17293274

申请日：2019-10-31

Applicant: POSCO

Inventor： Kyung-Hun Kim ,  Hak Kim ,  Man Jin Ha ,  Ji Soo Kim ,  Jong Jin Jeon

IPC: C22C38/58 ,  C22C38/02 ,  C22C38/44 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02

Abstract: Disclosed are austenitic stainless steel that can exhibit high strength while having non-magnetic properties, and a manufacturing method thereof.
The high strength non-magnetic austenitic stainless steel according to an embodiment of present disclosure includes, in percent (%) by weight of the entire composition, C: 0.02 to 0.12%, Si: 1.2% or less, Mn: 0.5 to 2.0%, Cr: 17.0 to 22.0%, Ni: 11.0 to 15.0%, Mo: 3.0% or less, N: 0.25% or less, the remainder of iron (Fe) and other inevitable impurities, satisfies C+N: 0.25% or more, and satisfies following Formulas (1) and (2). [{Cr+Mo+1.5*Si+18}/{Ni+30*(C+N)+0.5*Mn+36}+0.262]*161−161−log(cooling rate)

公开(公告)号：US09975170B2

公开(公告)日：2018-05-22

申请号：US14954218

申请日：2015-11-30

Applicant: POSCO

Inventor： Man Jin Ha ,  Jin Ho Kim ,  Suk Kyun Hwang ,  Sung Jin Park

IPC: B22D11/00 ,  B22D11/06 ,  B22D11/117 ,  C22C38/58 ,  C22C38/02 ,  C22C38/00

CPC classification number: B22D11/117 ,  B22D11/002 ,  B22D11/0622 ,  C22C38/001 ,  C22C38/02 ,  C22C38/58

Abstract: There is provided a method of manufacturing a high nitrogen duplex stainless steel sheet through a twin roll strip casting process without the occurrence of surface swelling on the high nitrogen duplex stainless steel sheet.