I don’t know why everyone is suggesting complicated means to destroy the steel plate. Acid is expensive and hard to come by and how will you melt it at 3000C in your home?

All you need to do is take a drill and make a few holes in it and you are done. If the drill breaks it means you got a cheap bit. Buy one of those $5 bits and it will drill thru steel like butter pretty much.

You also don’t need to drill all the way, just enough to destroy what is written on the main surface.