Title:
AUSTENITIC STAINLESS STEEL AND METHOD FOR MANUFACTURING AUSTENITIC STAINLESS STEEL
Document Type and Number:
WIPO Patent Application WO/2023/176215
Kind Code:
A1
Abstract:
Provided is an austenitic stainless steel having excellent strength and ductility. The austenitic stainless steel has: a chemical composition containing 0.005-0.060% of C, 0.20-1.20% of Si, 4.0-8.0% of Mn, 12.0-15.0% of Ni, 19.0-24.0% of Cr, 1.0-4.0% of Mo, 0.05-0.40% of Nb, 0.05-0.40% of V, 0.20-0.50% of N, and 0.050% or less of Al, etc.; a tensile strength of 800 MPa or above; and an elongation at break of 35% or above. The austenitic stainless steel satisfies the following relationships (1) and (2). Relationship 1: 0.7 × Nb ≤ [Nb] ≤ 0.30
Relationship 2: 20 × [Nb]/D ≥ 0.050
In relationships (1) and (2), a value in which the Nb content of the chemical composition is represented in mass%, a value in which the amount of Nb analyzed as an electrolytic extraction residue is represented in mass%, and a value in which the crystal grain diameter is represented in μm, are respectively substituted into "Nb", "[Nb]", and "D".
Inventors:
JOTOKU KANA (JP)
OSUKI TAKAHIRO (JP)
KAWANISHI TSUYOSHI (JP)
OSUKI TAKAHIRO (JP)
KAWANISHI TSUYOSHI (JP)
Application Number:
PCT/JP2023/004210
Publication Date:
September 21, 2023
Filing Date:
February 08, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D8/02; C21D8/06; C21D9/00; C21D9/46; C22C38/00; C22C38/58
Domestic Patent References:
| WO2017056619A1 | 2017-04-06 |
Foreign References:
| JP2020132979A | 2020-08-31 | |||
| JP2017008413A | 2017-01-12 |
Attorney, Agent or Firm:
UEBA, Hidetoshi et al. (JP)
Download PDF:
Previous Patent: BIAXIALLY ORIENTED POLYAMIDE FILM
Next Patent: INCUBATION DEVICE AND INCUBATION SYSTEM
Next Patent: INCUBATION DEVICE AND INCUBATION SYSTEM