公开(公告)号：US20230416885A1

公开(公告)日：2023-12-28

申请号：US18034951

申请日：2021-08-26

Applicant: POSCO CO., LTD.

Inventor： Jieon Park ,  Jong-su Paek

IPC: C22C38/28 ,  C22C38/02 ,  C22C38/00 ,  C21D6/00 ,  C21D8/02 ,  C21D9/00

CPC classification number: C22C38/28 ,  C22C38/02 ,  C22C38/001 ,  C22C38/004 ,  C21D6/002 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/021 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D9/0081 ,  C21D2211/005

Abstract: Disclosed is a ferritic stainless steel with improved strength, workability, and corrosion resistance, which may be applied to various industrial fields, such as washing machines, refrigerators, and all kinds of electric home appliances. An embodiment of the disclosed ferritic stainless steel comprises, in percent by weight (wt %), 0.0005 to 0.02% of C, 0.005 to 0.02% of N, 0.7 to 1.0% of Si, 16.0 to 17.0% of Cr, 0.05 to 0.3% of Ti, and the balance being Fe and inevitable impurities, wherein the ferritic stainless steel has a value of Formula (1) below satisfying 21 to 25, a tensile strength of 470 MPa or more, and an elongation of 27% or more.


7*Si+Cr  (1)

In Formula (1), Si and Cr represent the contents (wt %) of the respective elements.

公开(公告)号：US20230175108A1

公开(公告)日：2023-06-08

申请号：US17924230

申请日：2021-06-22

Applicant: POSCO

Inventor： Seokweon Song ,  Jong-su Paek ,  Hak Kim

IPC: C22C38/58 ,  C22C38/48 ,  C22C38/42 ,  C22C38/02 ,  C22C38/00 ,  C21D6/00 ,  C21D9/46 ,  C21D8/02

CPC classification number: C22C38/58 ,  C22C38/48 ,  C22C38/42 ,  C22C38/02 ,  C22C38/001 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D9/46 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263

Abstract: Disclosed is a high-strength austenitic stainless steel and a method for producing same, wherein the austenitic stainless steel has high productivity due to excellent hot workability thereof and a superior cost reduction effect due to a large decrease in content of nickel (Ni) which is a high-priced element, and has a yield strength of 450 MPa or more and an elongation of 45% or more after cold rolling and annealing and an ultra-high strength of 1800 MPa or more even after skin pass rolling, and a method for producing same.

公开(公告)号：US20230142021A1

公开(公告)日：2023-05-11

申请号：US17918014

申请日：2021-02-02

Applicant: POSCO

Inventor： Seokweon Song ,  Jong-su Paek

IPC: C22C38/58 ,  C21D8/02 ,  C22C38/02 ,  C22C38/42 ,  C22C38/00

CPC classification number: C22C38/58 ,  C21D8/0236 ,  C22C38/02 ,  C22C38/42 ,  C21D8/0205 ,  C21D8/0226 ,  C22C38/001 ,  C21D2211/001

Abstract: Disclosed are a low-cost austenitic stainless steel having high strength and high formability and a method for manufacturing same. The low-cost austenitic stainless steel having high strength and high formability according to an embodiment includes, greater than 0% and at most 0.08% of C, 0.2 to 0.25% of N, 0.8 to 1.5% of Si, 8.0 to 9.5% of Mn, 15.0 to 16.5% of Cr, greater than 0% and at most 1.0% of Ni, 0.8 to 1.8% of Cu, and the remainder of Fe and other unavoidable impurities and satisfies Expressions (1) to (4) below.


Ni+0.47Mn+15N≥7.5  (1)



23(C+N)+1.3 Si+0.24(Cr+Ni+Cu)+0.1Mn≥12  (2)



551−462(C+N)−9.2Si−8.1Mn−13.7Cr−29(Ni+Cu)≤70  (3)



11≤1+45C−5Si+0.09Mn+2.2Ni−0.28Cr−0.67Cu+88.6N≤17  (4)

Here, C, N, Si, Mn, Cr, Ni, and Cu represent contents (wt %) of the elements, respectively.