AUSTENITIC STAINLESS STEEL HAVING IMPROVED STRENGTH, AND METHOD FOR MANUFACTURING SAME

Title:

AUSTENITIC STAINLESS STEEL HAVING IMPROVED STRENGTH, AND METHOD FOR MANUFACTURING SAME

Document Type and Number:

WIPO Patent Application WO/2021/010599

Kind Code:

A2

Abstract:

Disclosed is an austenitic stainless steel having improved strength. This austenitic stainless steel is characterized by containing, in weight%, 0.06-0.15% of C, 0.3% or less (excluding 0) of N, more than 1.0% and 2.0% or less of Si, 5.0-7.0% of Mn, 15.0-16.0% of Cr, 0.3% or less (excluding 0) of Ni, and 2.5% or less (excluding 0) of Cu, with the remainder comprising Fe and inevitable impurities, and satisfying expressions (1), (2), and (3) below. Expression (1): 15≤ 0.2Mn+337C+1.2Cu-1.7Cr+3.3Ni+78N-3.5Si+3.0 ≤30; Expression (2): 2.3≤ [Cr+1.5Si]/[Ni+0.31Mn+22C+1Cu+14.2N] ≤3.0; Expression(3): 1.0≤ ((Cr+1.5Si+18)/(Ni+0.52Cu+30(C+N)+0.5Mn+36)+0.262)*161-161 ≤7.0, wherein C, N, Si, Mn, Cr, Ni, and Cu refer to the content (in weight%) of each element.

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Inventors:

SONG SEOK WEON (KR)
KIM HAK (KR)
KIM JI SOO (KR)

Application Number:

PCT/KR2020/007524

Publication Date:

January 21, 2021

Filing Date:

June 10, 2020

Export Citation:

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Assignee:

POSCO (KR)

International Classes:

C22C38/58

Attorney, Agent or Firm:

SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)

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