DISPERSED OXIDE REINFORCED MARTENSITIC STEEL EXCELLENT IN HIGH TEMPERATURE STRENGTH AND METHOD FOR PRODUCTION THEREOF

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 Y₂O₃particles 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.

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Inventors:

OHTSUKA SATOSHI (JP)
UKAI SHIGEHARU (JP)
KAITO TAKEJI (JP)
NARITA TAKESHI (JP)
FUJIWARA MASAYUKI (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 DEV INST (JP)
OHTSUKA SATOSHI (JP)
UKAI SHIGEHARU (JP)
KAITO TAKEJI (JP)
NARITA TAKESHI (JP)
FUJIWARA MASAYUKI (JP)

International Classes:

C22C1/10; B22F1/00; C22C33/02; C22C38/00; C22C38/22; C22C38/28; C22C38/50; (IPC1-7): C22C33/02

Foreign References:

EP0949346A1	1999-10-13
US4963200A	1990-10-16

Other References: