Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Plural heating steps including sintering
Reexamination Certificate
2006-11-28
2006-11-28
Jenkins, Daniel (Department: 1742)
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Plural heating steps including sintering
C419S028000, C419S029000
Reexamination Certificate
active
07141209
ABSTRACT:
There is provided a method for producing oxide dispersion strengthened ferritic steel tube by fabricating a raw tube by mixed sintering of a metal powder and an oxide powder and producing a tube of the desired shape by repeating cold rolling and heat treatment for a total of three times or more. The method comprises performing each of the intermediate heat treatments during the cold rolling by a two-step heat treatment consisting of a first step heat treatment of 1100° C. or lower and a second step heat treatment of 1100 to 1250° C. and higher than the first step temperature, and performing the final heat treatment at 1100° C. or higher.
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Derwent Abstract, EP1408128A, Apr. 14, 2004.
Kaito Takeji
Kobayashi Toshimi
Ohtsuka Satoshi
Ukai Shigeharu
Japan Nuclear Cycle Development Institute
Jenkins Daniel
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