Nippon Steel Corporation

Mitsubishi Jukogyo Kabushiki Kaisha

Akira Usami

Satoshi Nishimura

Shunji Sakamoto

Motohiro Okushima

Kenji Katoh

Takashi Kusunoki

Toshiei Hasegawa

Akira Shishibori

Yukio Tomita

Koji Tanabe

Yoshikazu Yamada

Hidesato Mabuchi

Kouji Tanabe

Ryuichiro Ebara

Takashi Inoue

Hiroshi Kondo

Katsutoshi Hashima

Masuo Matsumoto

Kazuhide Yamauchi

The present invention provides a steel material able to secure a superior corrosion resistance in a sulfuric acid dew point corrosive environment of exhaust gas obtained by burning high S-containing fuel, containing, by mass %, C: &#x2266;0.010%, Si: &#x2266;0.10%, Cu: 0.05 to 1.00%, P: &#x2266;0.030%, S: &#x2266;0.050%, and Al: &#x2266;0.10% and comprising a balance of Fe and unavoidable impurities. Further, this steel contains one type or two types or more of Sb, Sn, Cr, Mn, Mo, Ni, Nb, V, Ti, and B.

Steel excellent in resistance to sulfuric acid dew point corrosion

The present invention provides: a steel for a welded structure to be used for a crude oil tank that exhibits excellent general and local corrosion resistance in crude oil corrosion caused in a steel oil tank and is capable of suppressing the formation of corrosion products (sludge) containing solid sulfur; a method for producing said steel; a crude oil tank; and a method for preventing a crude oil tank against corrosion. The present invention makes it possible to obtain general and local corrosion resistance in a crude oil tank environment and suppress the formation of corrosion products (sludge) containing solid sulfur by using a steel: containing, in mass, 0.001 to 0.2% C, 0.01 to 2.5% Si, 0.1 to 2% Mn, 0.03% or less P, 0.007% or less S, 0.01 to 1.5% Cu, 0.001 to 0.3% Al, 0.001 to 0.01% N as basic components and, further, 0.01 to 0.2% Mo and/or 0.01 to 0.5% W; and preferably satisfying the following expression;Solute Mo+Solute W&#x2267;0.005%.

Crude oil tank fabricated from steel plate

Crude oil tank comprising a corrosion resistant steel alloy

The present invention provides a low alloy steel and a weld joint thereof excellent in hydrochloric acid corrosion resistance and sulfuric acid corrosion resistance, said low alloy steel containing, in mass, Here, said AI is given by the following expression,/10,000=0.0005+0.045&#xd7;Sb %&#x2212;C %&#xd7;Mo %,where % means mass %.

Low alloy steel and weld joint thereof excellent in corrosion resistance to hydrochloric acid and sulfuric acid

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

The invention relates to a steel plate which exhibits a good resistance to a corrosive atmosphere, containing weakly acidic condensed water comprising SO.sub.2, Cl.sup.- ion, and CO.sub.2 such as the exhaust gas from a boiler which burns LNG. The steel plate having a good corrosion resistance to condensed water characterized in comprising a low C content, a low Mn content and a medium amount of Cr content, and further 0.01% or less of S in an unavoidable impurity, or further comprising at least one element of Si, Al, Cu, Ni, Mo, Nb, V, Ti, Ca, and B. More, the steel plate having a good corrosion resistance to condensed water comprising carbonic acid gas and chloride ion characterized in comprising a low C content, a low Mn content, P, Cu and Ni, and further 0.01% or less of S in an unavoidable impurity, or further comprising at least one element of Si, Al, Mo, Nb, V, Ti, Ca and B.

Steel plate having good corrosion resistance to condensed water

Growing community of inventors

Futtsu, Japan

Akira Usami