公开(公告)号：US20200347487A1

公开(公告)日：2020-11-05

申请号：US16763061

申请日：2018-06-22

Applicant: POSCO

Inventor： Hak-Cheol LEE

IPC: C22C38/08 ,  C22C38/04 ,  C22C38/02 ,  C21D9/46 ,  C21D8/02 ,  C21D1/18

Abstract: Provided are a cryogenic steel plate and a method for manufacturing the same, the cryogenic steel plate comprising, in wt %, 0.04 to 0.08% carbon (C), 8.9 to 9.3% nickel (Ni), 0.6 to 0.7% manganese (Mn), and 0.2 to 0.3% silicon (Si), and 50 ppm or less of P, 10 ppm or less of S, and the remainder in iron (Fe) and various unavoidable impurities, and the microstructure at a ¼t location of the steel plate, where t is a thickness of the steel plate, comprising, in % surface area, 10% or more of tempered bainite, 10% or less of residual austenite, and the remainder of tempered martensite.

公开(公告)号：US20170327922A1

公开(公告)日：2017-11-16

申请号：US15535582

申请日：2015-12-21

Applicant: POSCO

Inventor： Hak-Cheol LEE ,  Sung-Ho JANG

IPC: C21D9/46 ,  C21D6/00 ,  C22C38/12 ,  C22C38/08 ,  C22C38/04 ,  C21D8/02 ,  C22C38/00 ,  C22C38/14 ,  C22C38/16 ,  C22C38/02

CPC classification number: C21D9/46 ,  C21D6/001 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/021 ,  C21D8/0226 ,  C21D8/0247 ,  C21D8/0263 ,  C21D2201/05 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16

Abstract: Provided are high-strength steel having superior brittle crack arrestability and a production method therefor. The high-strength steel comprises 0.05-0.1 wt % of C, 0.9-1.5 wt % of Mn, 0.8-1.5 wt % of Ni, 0.005-0.1 wt % of Nb, 0.005-0.1 wt % of Ti, 0.1-0.6 wt % of Cu, 0.1-0.4 wt % of Si, at most 100 ppm of P, and at most 40 ppm of S with the remainder being Fe and other inevitable impurities, and has microstructures including one structure selected from the group consisting of a single-phase structure of ferrite, a single-phase structure of bainite, a complex-phase structure of ferrite and bainite, a complex-phase structure of ferrite and pearlite, and a complex-phase structure of ferrite, bainite, and pearlite. The high-strength steel has high yield strength and superior brittle crack arrestability.

公开(公告)号：US20160312344A1

公开(公告)日：2016-10-27

申请号：US15102646

申请日：2013-12-26

Applicant: POSCO

Inventor： Hak-Cheol LEE ,  In-Shik SUH ,  Yong-Jin KIM ,  In-Gyu PARK

IPC: C22C38/04

CPC classification number: C22C38/04

Abstract: Provided is a steel having excellent weldability and impact toughness in a welding zone comprising: by weight (wt.) %, carbon (C): 0.1% to 0.3%, manganese (Mn): 11% to 13%, iron (Fe) as a residual component thereof, and other inevitable impurities, and positive and negative segregation zones in a layered form. The positive segregation zone comprises austenite and epsilon martensite, and the negative segregation zone comprises, by area fraction, epsilon martensite of less than 5% and alpha martensite.

Abstract translation: 本发明提供一种在焊接区域具有优异的焊接性和冲击韧性的钢，其特征在于：重量（wt。）％，碳（C）：0.1〜0.3％，锰（Mn）：11〜13％，铁（Fe） 作为其残留成分和其他不可避免的杂质，以及分层形式的正和负偏析区。 正偏析区包括奥氏体和ε马氏体，负偏析区由面积分数包括小于5％的马氏体和α马氏体组成。

公开(公告)号：US20150354037A1

公开(公告)日：2015-12-10

申请号：US14758203

申请日：2013-12-24

Applicant: POSCO

Inventor： Hak-Cheol LEE ,  In-Shik SUH ,  Soon-Gi LEE ,  In-Gyu PARK ,  Yong-Jin KIM ,  Hong-Ju LEE

IPC: C22C38/38 ,  C22C38/20 ,  C22C38/32 ,  C22C38/22 ,  C21D8/00 ,  C21D6/00

CPC classification number: C22C38/001 ,  C21D6/002 ,  C21D6/005 ,  C21D8/005 ,  C21D8/0226 ,  C21D8/0426 ,  C22C38/00 ,  C22C38/04 ,  C22C38/20 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38

Abstract: The present invention relates to a high strength austenitic-based steel with remarkable toughness of a welding heat-affected zone and a preparation method therefor. One embodiment of the present invention provides: a high strength austenitic-based steel with remarkable toughness of a welding heat-affected zone, comprising 0.8-1.5 wt % of C, 15-22 wt % of Mn, 5 wt % or less of Cr (except 0), and the balance of Fe and other inevitable impurities, and further comprising at least one of the following (a) and (b), wherein the microstructure of a welding heat-affected zone comprises 90% or more of austenite by volume fraction; and a preparation method therefor. (a) Mo: 0.1-1% and B: 0.001-0.02% (b) Ti: 0.01-0.3% and N: 0.003-0.1%

Abstract translation: 本发明涉及一种焊接热影响区具有显着韧性的高强度奥氏体系钢及其制备方法。 本发明的一个实施方案提供：焊接热影响区具有显着韧性的高强度奥氏体系钢，其包含0.8-1.5重量％的C，15-22重量％的Mn，5重量％以下的Cr （0除外），余量由Fe和其他不可避免的杂质构成，并且还包括以下（a）和（b）中的至少一个，其中焊接热影响区的微观结构包括90％以上的奥氏体 体积分数; 及其制备方法。 （a）Mo：0.1-1％和B：0.001-0.02％（b）Ti：0.01-0.3％和N：0.003-0.1％