METHOD FOR PRODUCING Cr-CONTAINING NICKEL-BASED ALLOY PIPE AND Cr-CONTAINING NICKEL-BASED ALLOY PIPE

WIPO Patent Application WO/2007/119706

A1

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.

KANZAKI, Manabu (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
神崎 学 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 住友金属工業株式会社内 Osaka, 5410041, JP)
KITAMURA, Kazukiyo (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)

JP2007/057833

October 25, 2007

April 09, 2007

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SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 Osaka, 5410041, JP)
KANZAKI, Manabu (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
神崎 学 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 住友金属工業株式会社内 Osaka, 5410041, JP)

C23C8/16; C22C19/05; C23C8/12; G21D1/00; F22B37/04

SUGIOKA, Kanji et al. (K. Sugioka Patent Office, Amagasaki Building5-17-23, Higashinaniwa-cho,Amagasaki-sh, Hyogo 92, 6600892, JP)

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