| 摘要 |
A structural steel excellent in wear resistance and fatigue resistance property, for use as a structural member of a bridge, pylon or the like erected in a shore region where there is concern about steel corrosion and fatigue at weld joint owing to scattering of sea salt particles or in a region where snow-melting salt is used, is provided at low cost and by a simple production method. The hot rolled structural steel contains, in percentage by weight, C : 0.02-0.20%, and further added with small amounts of Ni, Cu and Mo as essential elements, that is a rolled steel excellent in wear resistance and fatigue resistance property having a Ni/Cu concentration ratio of not less than 0.8, a steel surface internal oxide layer of not greater than 2 mu m, and a Ni, Cu and Mo concentrated layer of a thickness of not less than 2 mu m on the internal oxide layer. <IMAGE> <IMAGE> |
