CORROSION RESISTANT STEEL SHEET HAVING EXCELLENT COATING CORROSION RESISTANCE AND PITTING CORROSION RESISTANCE

摘要

PPROBLEM TO BE SOLVED: To provide a coated steel sheet which has excellent pitting corrosion resistance and coating corrosion resistance while having properties generally required for a coated steel sheet such as weldability and workability. PSOLUTION: The coated steel sheet is obtained by coating a steel sheet with a zinc-rich coating. The coated steel sheet contains, as components in steel, 0.001 to 0.10% C, 0.5% (inclusive of 0%) Si, 0.05 to 2.0% Mn, 0.03%Ti+Zr0.4% (inclusive of the case where the content of Zr is 0%), 0.03 to 0.5% Cu, 0.03 to 0.5% Ni, 0.020 to 0.1% P, 0.01% (inclusive of 0%) S, 0.02% (inclusive of 0%) Ca, and 0.003 to 0.20% Al. PCOPYRIGHT: (C)2003,JPO