Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Kenji Katoh

Michio Kaneko

Makoto Nagasawa

Akira Usami

Minoru Ito

Toshiei Hasegawa

Shiro Imai

Masatoshi Kominami

Toshiro Terakawa

Takashi Kumai

Akira Shishibori

A highly corrosion-resistant, rust-prevention coating material comprising:

Highly corrosion-resistant, rust-prevention coating material, highly corrosion-resistant steel, and steel structure

Zn alloy particles for high corrosion resistance rust prevention paint containing, by mass %, Mg: 0.01 to 30% and having a balance of Zn and unavoidable impurities, having physical fracture facets and/or cracks of a length of 0.01 &#x3bc;m or more or cracks of a depth of 0.01 &#x3bc;m or more, having an average particle size of 0.05 to 200 &#x3bc;m, and having an aspect ratio of maximum size and minimum size (maximum size/minimum size) of an average value of 1 to 1.5. Also, a high corrosion resistance rust prevention paint containing these Zn alloy particles and a high corrosion resistance steel material and steel structure coated with that paint.

Zn alloy particles for high corrosion resistance rust protection paint, method of production of particles, high corrosion resistance rust protection paint containing particles, high corrosion resistance steel material coated with paint, and steel structure having steel material

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

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Tokyo, Japan

Kenji Katoh