Metal treatment – Stock – Ferrous
Reexamination Certificate
2011-01-25
2011-01-25
Yee, Deborah (Department: 1793)
Metal treatment
Stock
Ferrous
C148S320000, C148S332000, C148S336000, C420S089000, C420S092000, C420S122000
Reexamination Certificate
active
07875130
ABSTRACT:
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;in-line-formulae description="In-line Formulae" end="lead"?Solute Mo+Solute W≧0.005%.in-line-formulae description="In-line Formulae" end="tail"?
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Hasegawa Toshiei
Katoh Kenji
Shishibori Akira
Usami Akira
Kenyon & Kenyon LLP
Nippon Steel Corporation
Yee Deborah
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