You sure aren't gonna hurt it, I doubt that it's going to do much. I've used walnut to strip paint and I doubt that even it would do anything to steel. You need an abrasive like trymeo is using which is basically a type of sand, aluminum oxide grit, or glass beads.It's a huge cabinet. I've used the stuff on some silver dinnerware that was in a fire and it's not very abrasive.
I think I'll give it a shot.