Corten is the steel used in Shipping Containers due to it's increased salt water corrosion resistance.
It is now being increasingly used in
laser cut forms as an architectural sign-writing material to give a rural/rustic appearance. Your laser-cutting steel supplier will be able to provide it in a range of thicknesses.
There minor changes to welding processes when combining it to either mild or stainless, but not enough to be a major worry.