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发明授权
CN101589167B 耐腐蚀性优异的钢材 失效 - 权利终止

耐腐蚀性优异的钢材
摘要：
本发明涉及一种耐腐蚀性优异的钢材，(A)其将如下元素作为必须成分：以质量％计，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％和Al：0.01～0.50％，此外，还含有从Cu：0.05～3.0％和Ni：0.05～6.0％之中选择的至少1种，余量由Fe和不可避免的杂质构成，在Ni、Cu、S和Ti的含量之间具有由[(Ni+4.5×Cu)×S×2500×Ti＞5]表示的关系；(B)表面由锈被覆，该锈含有S：0.3～5.0质量％，此外还含有Ti、Cu、Ni、Nb、Zr和V之中选择的至少1种合计为0.5～10.0质量％；并且(C)在表面形成有锈层，该锈层通过X射线衍射法求得的β-FeOOH成分的晶粒尺寸低于50nm，并且所述锈层的根据分子吸附法求得的比表面积为10m2/g以上。
摘要（英）：

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.

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