Where does it say “barge”?
FWIW, the steel used in shipbuilding must comply with ASTM/ASME specification (ASTM A131 / ASME SA 131) which is the standard specification for Structural Steel for Ships, and must meet all classification societies standards as well, such as Det Norske Veritas (DNV) and American Bureau of Shipping (ABS).
This steel is shot blasted and primed before it leaves the mill.