ATMOSPHERE CORROSION RESISTING STEEL SHOWING BLACKISH COLOR TONE FROM INITIAL STAGE OF RUSTING AND EXCELLENT IN EXTERNAL APPEARANCE CHARACTERISTIC AND STABILITY OF COLOR TONE

摘要

PROBLEM TO BE SOLVED: To provide an atmosphere corrosion resisting steel showing a blackish subdued rust color from the initial stage of exposure, that is, from the initial stage of construction of an outdoor steel structure, excellent in corrosion resistance, and capable of withstanding use in an uncoated state. ;SOLUTION: The steel has a composition consisting of, by weight, 0.01-0.15% C, 0.01-1.0% Si, 0.8-3.0% Mn, 0.05-1.0% Cu, 0.25-5.0% Ni, 0.01-0.2% Al, and the balance iron with inevitable impurities satisfying Mn+Ni ≥1.8%, and further containing, if necessary, one or ≥2 kinds among 0.25-5.0% Cr, 0.25-1.0% Mo, 0.03-1.0% P, 0.01-0.05% Nb, 0.01-0.1% V, 0.005-0.05% Ti, and 0.01-0.1% Zr, or/and 0.001-0.01%, in total of either or both of rare earth element and Ca.;COPYRIGHT: (C)2000,JPO