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Title:
HIGH-STRENGTH AND HIGH-TOUGHNESS MARAGING STAINLESS STEEL FOR ULTRALOW-TEMPERATURE ENGINEERING AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2024/082324
Kind Code:
A1
Abstract:
A high-strength and high-toughness maraging stainless steel for ultralow-temperature engineering and a manufacturing method therefor. The main components in the steel comprise: 11.00%-13.00% of Cr, 9.00%-11.00% of Ni, 2.00%-4.00% of Mo, Ti less than or equal to 0.05%, 0.001%-0.080% of Al, and the balance of iron, harmful elements, and impurities; the tensile strength at a room temperature is larger than or equal to 950 MPa, the yield strength is larger than or equal to 900 MPa, the impact toughness Kv2 at the room temperature is larger than or equal to 150 J, and the impact toughness Kv2 at -196°C is larger than or equal to 80 J. The ratio of chemical components in the maraging stainless steel is optimized, a proper amount of alloying element Mo is added on the basis of Cr and Ni stainless steel for alloying, and the addition amount of Ti is controlled to avoid the formation of large-sized TiN and TiCN inclusions, fine and stable reversed austenite is formed in the steel in cooperation with a proper heat treatment process, so that the toughness of the steel, especially the ultralow-temperature toughness, is remarkably improved, and the comprehensive performance of the maraging stainless steel is greatly improved.

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Inventors:
HE YI (CN)
WANG JUNSHENG (CN)
XIN RUISHAN (CN)
Application Number:
PCT/CN2022/127559
Publication Date:
April 25, 2024
Filing Date:
October 26, 2022
Export Citation:
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Assignee:
ANSTEEL BEIJING RES INSTITUTE CO LTD (CN)
International Classes:
C22C38/02; C21D1/00
Domestic Patent References:
WO2009077987A12009-06-25
Foreign References:
CN111118258A2020-05-08
JP2002105604A2002-04-10
CN112410674A2021-02-26
CN113774291A2021-12-10
CN114717488A2022-07-08
CN113774290A2021-12-10
CN114517276A2022-05-20
CN101050509A2007-10-10
JP2009120954A2009-06-04
Attorney, Agent or Firm:
ANSHAN JIA XUN TECHNOLOGY PATENT OFFICE (GENERAL PARTNERSHIP) (CN)
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