DannyT,

On behalf of Grendel, I can answer since I too work in the field.

Generally, bare stainless to ocean will be 316, 17-4, or 2205 duplex. Differences in grades particularly with 17-4 and duplex, and usually with 316 you would find 316L because the L designates a low carbon content for improved weldability. However reduced carbon can reduce strength but increase ductility/charpy characteristics.