公开(公告)号：US11339459B2

公开(公告)日：2022-05-24

申请号：US16473030

申请日：2017-05-15

Applicant: POSCO

Inventor： Jung-Hyun Kong ,  Sang Seok Kim ,  Mi Nam Park

IPC: C22C38/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/48 ,  C22C38/50

Abstract: The present invention discloses a gold-colored steel sheet capable of expressing color without peeling of a modified layer and the gold-colored steel sheet capable of forming a color-modified layer through a conventional annealing process without expensive facilities.
A method of manufacturing the gold-colored steel sheet according to an embodiment of the present invention can form a TiN modified layer on a surface of a steel sheet comprising 0.3 to 1.5 wt % of titanium (Ti) by an annealing treatment in a nitrogen (N2) atmosphere at 900 to 1,200° C. for 30 to 300 seconds.

公开(公告)号：US11959159B2

公开(公告)日：2024-04-16

申请号：US17275408

申请日：2019-08-22

Applicant: POSCO

Inventor： Sang Seok Kim ,  Deok Chan Ahn ,  Mi-Nam Park ,  Hyun Woong Min ,  Yung Min Kim

IPC: C22C38/58 ,  C21D6/00 ,  C21D8/10 ,  C21D9/08 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44

CPC classification number: C22C38/58 ,  C21D6/004 ,  C21D8/105 ,  C21D9/08 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C21D2211/001

Abstract: The austenitic stainless steel that does not cause defects such as aging crack or delayed fracture even after the expansion and curling process of 5 steps or more is disclosed. In accordance with an aspect of the present disclosure, an austenitic stainless steel with excellent pipe expanding workability and aging crack resistance includes, in percent (%) by weight of the entire composition, C: 0.01 to 0.04%, Si: 0.1 to 1.0%, Mn: 0.1 to 2.0%, Cr: 16 to 20%, Ni: 6 to 10%, Cu: 0.1 to 2.0%, Mo: 0.2% or less, N: 0.035 to 0.07%, the remainder of iron (Fe) and other inevitable impurities, and the C+N satisfies 0.1% or less, the product of the Md30 (° C.) value and average grain size (μm) satisfies less than −500.

公开(公告)号：US11952649B2

公开(公告)日：2024-04-09

申请号：US17312119

申请日：2019-08-23

Applicant: POSCO

Inventor： Jong Jin Jeon ,  Mi-Nam Park ,  Sang Seok Kim

IPC: C22C38/44 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42

CPC classification number: C22C38/44 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D9/46 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008

Abstract: A stainless steel with a yield strength of 2,200 MPa or more is disclosed through the generation of the strain-induced martensite phase and the increase of the martensite phase strength. A high strength stainless steel according to an embodiment of present disclosure includes, in percent (%) by weight of the entire composition, C: 0.14 to 0.20%, Si: 0.8 to 1.0%, Mn: more than 0 and 0.5% or less, Cr: 15.0 to 17.0%, Ni: 4.0 to 5.0%, Mo: 0.6 to 0.8%, Cu: 0.5% or less, N: 0.05 to 0.11%, the remainder of iron (Fe) and other inevitable impurities, and C+N: 0.25% or more and Md30 value satisfies 40° C. or more.

公开(公告)号：US20200095656A1

公开(公告)日：2020-03-26

申请号：US16473030

申请日：2017-05-15

Applicant: POSCO

Inventor： Jung-Hyun Kong ,  Sang Seok Kim ,  Min Nam Park ,  Dong Chul Chae

IPC: C22C38/00 ,  C22C38/50 ,  C22C38/02 ,  C22C38/04 ,  C22C38/48 ,  C21D9/46 ,  C21D8/02

Abstract: The present invention discloses a gold-colored steel sheet capable of expressing color without peeling of a modified layer and the gold-colored steel sheet capable of forming a color-modified layer through a conventional annealing process without expensive facilities.A method of manufacturing the gold-colored steel sheet according to an embodiment of the present invention can form a TiN modified layer on a surface of a steel sheet comprising 0.3 to 1.5 wt % of titanium (Ti) by an annealing treatment in a nitrogen (N2) atmosphere at 900 to 1,200° C. for 30 to 300 seconds.

公开(公告)号：US20220033941A1

公开(公告)日：2022-02-03

申请号：US17312119

申请日：2019-08-23

Applicant: POSCO

Inventor： Jong Jin Jeon ,  Mi-Nam Park ,  Sang Seok Kim

IPC: C22C38/44 ,  C22C38/42 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00

Abstract: A stainless steel with a yield strength of 2,200 MPa or more is disclosed through the generation of the strain-induced martensite phase and the increase of the martensite phase strength. A high strength stainless steel according to an embodiment of present disclosure includes, in percent (%) by weight of the entire composition, C: 0.14 to 0.20%, Si: 0.8 to 1.0%, Mn: more than 0 and 0.5% or less, Cr: 15.0 to 17.0%, Ni: 4.0 to 5.0%, Mo: 0.6 to 0.8%, Cu: 0.5% or less, N: 0.05 to 0.11%, the remainder of iron (Fe) and other inevitable impurities, and C+N: 0.25% or more and Md30 value satisfies 40° C. or more.