Translate this page , St52-3, St50-2, A572 60, A633 A, Q345B, SM490A , Stainless Steel Coils , cheap mirror finish 304 stainless steel sheet - Steel Proper way to mirror polish 304 SS? - Practical MachinistDec 10, 2006 · The material is T304 stainless steel tubing. The desired finish is a mirror polish. The application is an exhaust tip, probably hundreds of them. I polish aluminum all the time. I've tried stainless and the end result looks like raw 6061.