Steel for chimney or gas duct, excellent in pitting resistance a

Details Steel for chimney or gas duct, excellent in pitting resistance a Steel for chimney or gas duct, excellent in pitting resistance a

1996-08-20

1998-10-13

Yee, Deborah

Alloys or metallic compositions

Ferrous

Chromium containing, but less than 9 percent

420110, 420109, 420126, C22C 3814, C22C 3828, C22C 3850

Patent

active

058208194

ABSTRACT:
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. %.

REFERENCES:
patent: 3899368 (1975-08-01), Waid et al.
patent: 4957701 (1990-09-01), Masuyama et al.
Nippon Steel Corp.'s catalog entitled "Sulfuric Acid Dew Point Corrosion Resistant Steel S-TEN", Cat. No. AC107, Version Jul. 1992.
Nippon Steel Corp.'s catalog entitled "Sulfuric Acid Dew Point Corrosion Registant Steel YUS260", Cat. No. SS109, Version Jan. 1991.
Mitsubishi Heavy Industries Technical Report, vol. 27, No. 5, Sep. 1990-9.

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