Nippon Steel Corporation

Mitsubishi Jukogyo Kabushiki Kaisha

Katsutoshi Hashima

Yukio Tomita

Akira Usami

Koji Tanabe

Yoshikazu Yamada

Hidesato Mabuchi

Hiroshi Kondo

Ryuichiro Ebara

Masuo Matsumoto

Kazuhide Yamauchi

The present invention has an object to provide a steel for a chimney or a gas duct, which is excellent in pitting resistance and rust adhesion in a corrosive environment caused by combustion waste gas in a plant in which the combustion of natural gas occurs. Pitting resistance and rust adhesion are remarkably improved in the steel of the present invention which steel is prepared by using a 5% Cr steel as the base, while reducing an impurity sulfur to not more than 0.010 wt. %, adding titanium within a range of 0.005 to 0.05 wt. %, and further adding nickel alone within a range of 1.0 to 2.5 wt. %, or adding molybdenum alone within a range of 0.10 to 1.0 wt. %, or adding in combination therewith trace amount of copper or molybdenum within a range of 0.10 to 1.0 wt. %.

Steel for chimney or gas duct, excellent in pitting resistance and rust

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Hiroshima, Japan

Katsutoshi Hashima