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WordNet
shell plating

n. the plates covering the frame of a steel ship and corresponding to the planking of a wooden ship

Wikipedia
Shell plating

Shell plating is the outer-most structure on the hull of a steel or aluminum ship or boat.

Usage examples of "shell plating".

He was carrying a twenty-millimeter projectile pistol, a nasty weapon designed for use inside a ship, its slug heavy and relatively slow moving, incapable of penetrating the shell plating or bulkheads of a ship.

Williams, who was responsible for maintenance, must have been making a mental tally of every rivet, every welded seam in the shell plating.

They stood there on the curved shell plating, held in place by the magnetic soles of their boots.