Title:
PRODUCTION METHOD FOR RING-ROLLED MATERIAL OF Fe-Ni-BASED SUPER-HEAT-RESISTANT ALLOY
Document Type and Number:
WIPO Patent Application WO/2020/059797
Kind Code:
A1
Abstract:
Provided is a production method for an Fe-Ni-based super-heat-resistant alloy ring-rolled material that is highly circular, suppresses AGG, and has a fine grain structure that has an ASTM grain size number of at least 8. A production method for a ring-rolled material of an Fe-Ni-based super-heat-resistant alloy that has an alloy 718 composition. As ring rolling steps for finishing a ring-shaped ring-rolled raw material that has the abovementioned composition, the production method involves heating the ring-rolled raw material at a temperature of 900°C–980°C and performing finishing ring rolling on the ring-rolled raw material, heating the finishing-ring-rolled ring-rolled material at a temperature of 980°C–1010°C, and using a ring expander to expand the ring-rolled material and correct the ellipticity thereof.
Inventors:
AOKI CHUYA (JP)
FUKUI TSUYOSHI (JP)
OHTOYO DAIGO (JP)
FUJITA ETSUO (JP)
IWASA NAOYUKI (JP)
HIROSAWA TAKU (JP)
FUKUI TSUYOSHI (JP)
OHTOYO DAIGO (JP)
FUJITA ETSUO (JP)
IWASA NAOYUKI (JP)
HIROSAWA TAKU (JP)
Application Number:
PCT/JP2019/036756
Publication Date:
March 26, 2020
Filing Date:
September 19, 2019
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
C22F1/10; B21D3/14; B21H1/00; C22C19/05; C22F1/00
Foreign References:
| JP2011079043A | 2011-04-21 | |||
| KR20120017896A | 2012-02-29 | |||
| JP5994951B2 | 2016-09-21 |
Other References:
See also references of EP 3854901A4
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