| 摘要 |
<p>PROBLEM TO BE SOLVED: To protect a field structure from corrosion resulting from rain, wind, and the like, give sufficient durability, and use it without troubles of repair, exchange, or the like by constituting a field structure provided on the outside of a building and the like out of weather resistance steel. SOLUTION: For example, an emergency staircase 1 on a building, an apartment, or the like is constituted of all the handrails 2, step parts 3, landings 4 made of weather resistant steel. This weather resistant steel is constituted so that main additional elements are CU, Cr useful for corrosion resistance, further fixed quantities of Ni, Mo, Nb, V, and the like are added to it, and a fine, stable, and strong rust layer is formed on the surface of steel out of these elements to constitute the structure. This weather resistant steel brings out the same effect as a sort of paint by the surface rust layer, simultaneously with preventing corrosion of steel resulting from rain, wind, and like, and durable years can be maintained equal to or more than the durable years of the building, the apartment house, and the like by the color change of black brown with the lapse of time. Consequently, the structure can be used without requiring rebuilding the staircase part only or repairing on the way.</p> |
