Title:
METHOD FOR MANUFACTURING AUSTENITIC HEAT-RESISTANT STEEL
Document Type and Number:
WIPO Patent Application WO/2021/220913
Kind Code:
A1
Abstract:
This method is for manufacturing austenitic heat-resistant steel in which a difference between the content of Nb and the amount of Nb analyzed as an electrolytic extraction residue satisfies [0.170≤Nb-NbER≤0.480]. The method for manufacturing austenitic heat-resistant steel has: a molding step for molding steel having a predetermined chemical composition into a product shape; a solid solution heat treatment step for, after the molding step, performing heat treatment under a condition that heat treatment temperature satisfies [-250Nb+1200≤T≤-100Nb+1290] and heat treatment time satisfies [405-0.3T≤t≤2475-1.5T]; and a cooling step for performing cooling after the solid solution heat treatment step.
Inventors:
HIRATA HIROYUKI (JP)
SETO MASAHIRO (JP)
YOSHIZAWA MITSURU (JP)
HIGUCHI JUNICHI (JP)
OSUKI TAKAHIRO (JP)
SETO MASAHIRO (JP)
YOSHIZAWA MITSURU (JP)
HIGUCHI JUNICHI (JP)
OSUKI TAKAHIRO (JP)
Application Number:
PCT/JP2021/016189
Publication Date:
November 04, 2021
Filing Date:
April 21, 2021
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D8/00; C22C38/00; C22C38/54
Domestic Patent References:
| WO2009044796A1 | 2009-04-09 | |||
| WO2013073055A1 | 2013-05-23 |
Foreign References:
| CN101633999A | 2010-01-27 | |||
| JP2014001436A | 2014-01-09 | |||
| JP2017014575A | 2017-01-19 | |||
| JPH1121624A | 1999-01-26 | |||
| JP2003166039A | 2003-06-13 | |||
| JP2001049400A | 2001-02-20 | |||
| JP2021049572A | 2021-04-01 | |||
| JPS62133048A | 1987-06-16 | |||
| JP2000256803A | 2000-09-19 | |||
| JP2014001436A | 2014-01-09 | |||
| JP2003268503A | 2003-09-25 |
Other References:
See also references of EP 4144872A1
Attorney, Agent or Firm:
BRIGHTAS IP ATTORNEYS (JP)
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