Back to results
US 7,922,838 B2Granted
Crude oil tank fabricated from steel plate
AssigneeNippon Steel Corporation
InventorsAkira Usami, Kenji Katoh, Toshiei Hasegawa, Akira Shishibori
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeNippon Steel Corporation
InventorsAkira Usami, Kenji Katoh, Toshiei Hasegawa, Akira Shishibori
Estimating the term…
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≧0.005%.
A crude oil tank, said crude oil tank being fabricated from a steel plate having a thickness of 40 mm or less and comprising, 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, 0.1 to 1.5% Cu, 0.001 to 0.3% Al, 0.001 to 0.01% N, 0.03 to 01% Mo and optionally 0.01 to 0.5% W,
Dependencies are inferred from the claim text.