The invention provides a steel material for a tank upper deck of a crude oil tanker or for a hold of a bulk carrier and the steel material presents excellent corrosion resistance even if exposed an inclement corrosion environment having sulfur-containing materials such as sulfur, sulfoxides and sulfide. Compared with conventional steel materials, the steel material provided by the invention has the sme or higher welding property and heat processing property. The steel material for the tank upper deck of the crude oil tanker is characterized in that the content of C is 0.01-0.30%, Si is 0.20-1.0%, Mn is 0.50-1.60%, P is 0.005-0.040%, S is 0.005-0.020%, Al is 0.050-0.100%, Cu is 0.20-0.10%, Ni is below 0.03%(containing 0%), Cr is 0.05-0.30%, Zn is 0.001-0.05%, Sn is 0.005-0.050% and Ca is 0.0005-0.0050%, and the balance Fe with inevitable impurities.
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