Steel material having excellent corrosion resistance
A technology of corrosion resistance and steel materials, which is applied in the field of steel materials with excellent corrosion resistance, can solve the problems of not having exposed corrosion resistance, and achieve the effect of excellent corrosion resistance and high corrosion resistance
Inactive Publication Date: 2011-10-12
KOBE STEEL LTD
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Problems solved by technology
[0011] However, the existing steel products do not have excellent exposed corrosion resistance under acid rain with a pH of 4.5 or less and air pollution with a lot of sulfur oxides, and cannot be used in civil engineering, construction, iron towers, bridges, construction machinery, steel pipes, storage, etc. Exhibit high corrosion resistance for steel structures such as tanks
Method used
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Embodiment
[0067] Hereinafter, the present invention will be specifically described by comparing Examples satisfying the requirements of the present invention and Comparative Examples not satisfying the requirements of the present invention. In addition, the following examples are representative, but this invention is not limited to these examples.
[0068] (Example No.1~16)
[0069]Ingots having the chemical compositions shown in Table 1 were dissolved in respective laboratory grade atmospheres. The casting mold used a 45 kgf angle casting mold for thin plates, and produced ingots having the chemical compositions shown in Table 1. Next, rough rolling is performed on these ingots. The heating condition is 1100°C×30 minutes, and the hot rolling rolling table is not specified, so that the final thickness is 25mm×the width×length (here, the so-called "the width" means that the thickness of the plate is not particularly specified. The width is in the state of the width corresponding to ro...
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Abstract
Disclosed is a steel material having excellent corrosion resistance, which is characterized by the following properties (A) to (C); (A) the steel material comprises the following components (by mass) as essential components: C: 0.02-0.15%, Si: 0.10-1.0%, Mn: 0.1-1.5%, S: 0.02-0.5%, Ti: 0.02-0.15%, Ca: 0.0001-0.01% and Al: 0.01-0.50%, and contains at least one component selected from Cu in an amount of 0.05-3.0% and Ni in an amount of 0.05-6.0%, with the remainder being Fe and unavoidable impurities, wherein the contents of Ni, Cu, S and Ti have the relationship represented by the following formula: [(Ni+4.5xCu)xSx2500xTi>5]; (B) the surface of the steel material is covered with a rust containing S in an amount of 0.3-5.0% by mass and further containing at least one element selected from Ti, Cu, Ni, Nb, Zr and V in the total amount of 0.5-10.0% by mass; and (C) a rust layer is formed on the surface of the steel material, wherein the crystallite size of a ss-FeOOH component in the rust layer is less than 50 nm as measured by the X-ray diffraction method, and the rust layer has a specific surface area of 10 m<2> / g or greater as measured by the molecular adsorption method.
Description
technical field [0001] The present invention relates to materials suitable for steel structures such as civil engineering, construction, iron towers, bridges, construction machinery, steel pipes, storage tanks, etc., especially steel structures that require excellent corrosion resistance in an air-polluted environment with many sulfur oxides It is a steel material with excellent corrosion resistance as the raw material of the object. Background technique [0002] In general, the corrosion of steel is severe in heavy chemical industry areas, sulfur oxides and dusty air pollution environments accompanied by coal combustion, hot spring areas and volcanic areas with sulfur and hydrogen sulfide, and the reason is considered to be Slightly acidic environment due to sulfur oxides. As one of the corrosion-resistant materials suitable for this environment, alloy steel has been used conventionally. [0003] Conventionally, steel containing Cr and Ni to improve corrosion resistance h...
Claims
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IPC IPC(8): C22C38/00C22C38/60C22C38/50
CPCC22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/14C22C38/60
Inventor 汤濑文雄久本淳
Owner KOBE STEEL LTD