If just for looks...then anything can do...even aluminum as it is
just for looks and not for working/doing something
If you use it, then steel would be my recommendation
Chrome on these things are mostly 'ornamental chrome' and has lots to do with
how they spec'd it out
Ornamental chrome generally has the steel lightly buffed, then plated with
a soft metal (very thin layer) that can be buffed out to a mirror finish...then
it is electroplated with a thin layer of chrome
Chrome is the main ingredient of Stain Less steel that makes it stainless...or
not rust easily
Next time you see a bulldozer/backhoe/etc...look at their hydraulic cylinder
rods. They are exposed and most times left outside for their whole life. NO RUST
on them, as they are plated directly to the steel and none of the soft metal
on ornamental chrome