Title:
PRECIPITATION HARDENING-TYPE SOFT-MAGNETIC FERRITIC STAINLESS STEEL HAVING EXCELLENT MACHINABILITY
Document Type and Number:
WIPO Patent Application WO/2024/014419
Kind Code:
A1
Abstract:
This precipitation hardening-type soft-magnetic ferritic stainless steel has a composition containing, in mass%, 0.1% or less of C (not including 0%), 0.01-2.5% of Si, 0.5% or less of Mn (not including 0%), 0.1% or less of S (not including 0%), 12.0-19.0% of Cr, 1.0-4.0% of Ni, 0.5-3.0% of Al, and 0.05-0.5% of Ti and/or not less than 0.05 but less than 0.3% of Zr, and also containing 0.02-0.5% of Bi, the remaining portion being unavoidable impurities and Fe. The structure obtained by subjecting the composition to a solution treatment of heating for 2 hours at 1050°C and then rapidly quenching the same in nitrogen gas, and thereafter to an aging treatment for 3 hours at 550°C, is a ferrite phase, and has a hardness of 300 Hv or more after the aging treatment. The precipitation hardening-type soft-magnetic ferritic stainless steel has excellent soft magnetic properties, aging hardness, and corrosion resistance, and has excellent machinability.
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Inventors:
WATANABE MASAHITO (JP)
MIYANO TAKUMA (JP)
NARUSE TATSUYA (JP)
OWARI NAOYUKI (JP)
SATO TAKENOBU (JP)
EBATA TAKASHI (JP)
MIYANO TAKUMA (JP)
NARUSE TATSUYA (JP)
OWARI NAOYUKI (JP)
SATO TAKENOBU (JP)
EBATA TAKASHI (JP)
Application Number:
PCT/JP2023/025371
Publication Date:
January 18, 2024
Filing Date:
July 10, 2023
Export Citation:
Assignee:
TOHOKU STEEL CO LTD (JP)
International Classes:
C21D6/00; C21D8/00; C21D9/00; C22C38/00; C22C38/60; H01F1/147
Domestic Patent References:
| WO2021166797A1 | 2021-08-26 |
Foreign References:
| US20050217769A1 | 2005-10-06 | |||
| JP2001040456A | 2001-02-13 | |||
| JP2000169944A | 2000-06-20 |
Attorney, Agent or Firm:
SUDA Atsushi (JP)
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