PURPOSE: To provide a clad steel plate having excellent corrosion resistance used to steel structure, such as bridge, building, particularly in the corrosive atmosphere having much chlorine ion, such as coastal zone.
CONSTITUTION: A plural-layer cast slab composed of a steel containing ≤0.20wt.% C, 0.03-0.35% Si, ≤1.8% Mn, 0.005-0.070% Al and the balance Fe with impurities in the inner part as the base material and coated with a clad material containing ≤0.08wt.% C, 0.03-0.35% Si, ≤1.5% Mn, 0.5-2.0% Cu, 1.0-4.0% Ni, 0.005-0.070% Al and the balance Fe with impurities in the surface layer part, is produced by continuous casting, and the case slab is heated at 1000-1300°C and successively, after hot-rolling is executed at ≥650°C finish temp., this clad steel plate is air-cooled or water-cooled.
INOUE HISASHI
USAMI AKIRA
