ULTRAHIGH-STRENGTH, HOT-DIPPED GALVANIZED STEEL SHEET HAVING A MARTENSITIC STRUCTURE AS A BASE, AND A PRODUCTION METHOD THEREFOR

摘要

The present invention relates to a hot-dipped galvanized steel sheet and to a production method therefor. The hot-dipped galvanized steel sheet comprises: i) a steel sheet having a martensitic structure as a base; and ii) a hot-dipped galvanized layer formed on the steel sheet. The steel sheet comprises from 0.05 wt% to 0.30 wt% of copper, from 0.5 wt% to 3.5 wt% of manganese, from 0.1 wt% to 0.8 wt% of silicon, from 0.01 wt% to 1.5 wt% of aluminium, from 0.01 wt% to 1.5 wt% of chromium, from 0.01 wt% to 1.5 wt% of molybdenum, from 0.001 wt% to 0.10 wt% of titanium, from 5 ppm to 120 ppm of nitrogen, from 3 ppm to 80 ppm of boron, and a balance of iron and impurities.