Ignoramus11443 fired this volley in
:

304L is cheaper, though, would it practicaly be inferior to 316L for a
grill grate?

316 is more corrosion resistant, but all of them lose their corrosion
resistance once heated too high.

If I were you, I'd be looking for some 11ga 316 expanded lath, rather than
going to all the trouble of cutting and welding. Anywhere you weld the
material, unless you re-heat treat it, you'll end up with rust.

LLoyd