C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 8/16 (2006.01) C22C 19/05 (2006.01) C23C 8/12 (2006.01) G21D 1/00 (2006.01) F22B 37/04 (2006.01)
Patent
CA 2648711
For the purpose of uniformly forming a chromium oxide coating film on the inner surface of a Cr-containing nickel-based alloy pipe at low cost, a Cr-containing nickel-based alloy pipe is heated in an atmosphere gas composed of a carbon dioxide gas and a non-oxidizing gas, and an oxide coating film composed of chromium oxide and having a thickness of 0.2-1.5 µm is formed on the inner surface of the Cr-containing nickel-based alloy pipe. The atmosphere gas may contain not more then 5 vol% of an oxygen gas and/or not more than 7.5 vol% of water vapor in place of a part of the carbon dioxide gas.
Afin de former de façon uniforme une pellicule protectrice en oxyde de chrome sur la surface interne d'un tuyau en alliage à base de nickel contenant du Cr à un coût réduit, un tuyau en alliage à base de nickel contenant du Cr est chauffé dans un gaz atmosphérique composé de gaz carbonique et de gaz non oxydant, et une pellicule protectrice en oxyde composé d'oxyde de chrome et ayant une épaisseur comprise entre 0,2 et 1,5 µm est formée sur la surface interne du tuyau en alliage à base de nickel contenant du Cr. Le gaz atmosphérique ne peut pas contenir plus de 5 % en volume d'un gaz oxygène et/ou pas plus de 7,5 % en volume de vapeur d'eau à la place d'une partie du gaz carbonique.
Hirohata Noriaki
Kanzaki Manabu
Kitamura Kazuyuki
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
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