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Title:
DISPERSED OXIDE REINFORCED MARTENSITIC STEEL EXCELLENT IN HIGH TEMPERATURE STRENGTH AND METHOD FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2004/015154
Kind Code:
A1
Abstract:
A dispersed oxide reinforced martensitic steel containing Y2O3 particles dispersed therein, which has a chemical composition in mass %: C: 0.05 to 0.25 %, Cr: 8.0 to 12.0 %, W: 0.1 to 4.0 %, Ti: 0.1 to 1.0 %, Y2O3: 0.1 to 0.5 %, and the balance: Fe and inevitable impurities, wherein the content of Ti is adjusted, within the above range of 0.1 to 1.0 %, so as for an excessive oxygen amount (ExO) to satisfy the following: 0.22 X Ti(mass %) < ExO (mass %) < 0.46 X Ti(mass %); and a method for producing the martensitic steel which comprises carrying out the mechanical alloying of raw material powders in an atmosphere of an ultra high purity Ar of 99.9999 % or more, or carrying out the mechanical alloying with a reduced agitating energy, or using a metallic Y powder or a Fe2Y powder in place of a Y2O3 powder, to thereby suppress the amount of oxygen being incorporated into the steel and control the amount of the excessive oxygen within a predetermined range. The dispersed oxide reinforced martensitic steel contains dispersed oxide particles being finely divided and having an enhanced density, and thereby exhibits excellent strength at a high temperature.

Inventors:
Ohtsuka, Satoshi c/o Japan Nuclear Cycle Development Institute (Oarai Engineering Center, 4002 Narita-cho, Oarai-mach, Higashi-Ibaraki-gun Ibaraki, 311-1313, JP)
Ukai, Shigeharu c/o Japan Nuclear Cycle Development Institute (Oarai Engineering Center, 4002 Narita-cho, Oarai-mach, Higashi-Ibaraki-gun Ibaraki, 311-1313, JP)
Kaito, Takeji c/o Japan Nuclear Cycle Development Institute (Oarai Engineering Center, 4002 Narita-cho, Oarai-mach, Higashi-Ibaraki-gun Ibaraki, 311-1313, JP)
Narita, Takeshi c/o Japan Nuclear Cycle Development Institute (Oarai Engineering Center, 4002 Narita-cho, Oarai-mach, Higashi-Ibaraki-gun Ibaraki, 311-1313, JP)
Fujiwara, Masayuki c/o Kobelco Research Institute (Inc. 5-5, Takatsukadai 1-chome, Nishi-k, Kobe-shi Hyogo, 651-2271, JP)
Application Number:
PCT/JP2003/010081
Publication Date:
February 19, 2004
Filing Date:
August 07, 2003
Export Citation:
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Assignee:
JAPAN NUCLEAR CYCLE DEVELOPMENT INSTITUTE (4-49, Muramatsu Tokai-mur, Naka-gun Ibaraki, 319-1184, JP)
Ohtsuka, Satoshi c/o Japan Nuclear Cycle Development Institute (Oarai Engineering Center, 4002 Narita-cho, Oarai-mach, Higashi-Ibaraki-gun Ibaraki, 311-1313, JP)
Ukai, Shigeharu c/o Japan Nuclear Cycle Development Institute (Oarai Engineering Center, 4002 Narita-cho, Oarai-mach, Higashi-Ibaraki-gun Ibaraki, 311-1313, JP)
Kaito, Takeji c/o Japan Nuclear Cycle Development Institute (Oarai Engineering Center, 4002 Narita-cho, Oarai-mach, Higashi-Ibaraki-gun Ibaraki, 311-1313, JP)
Narita, Takeshi c/o Japan Nuclear Cycle Development Institute (Oarai Engineering Center, 4002 Narita-cho, Oarai-mach, Higashi-Ibaraki-gun Ibaraki, 311-1313, JP)
Fujiwara, Masayuki c/o Kobelco Research Institute (Inc. 5-5, Takatsukadai 1-chome, Nishi-k, Kobe-shi Hyogo, 651-2271, JP)
International Classes:
B22F1/00; C22C1/10; C22C33/02; C22C38/00; C22C38/22; C22C38/28; C22C38/50; (IPC1-7): C22C33/02
Foreign References:
EP0949346A11999-10-13
US4963200A1990-10-16
Other References:
See also references of EP 1528112A1
Attorney, Agent or Firm:
Shimizu, Chiharu (Nakagin-Shiroyama Bldg, 4th Floor 16-13, Ginza 8-chom, Chuo-ku Tokyo, 104-0061, JP)
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