Can you file 2mm stainless steel?

Can. Diamond files can be, small sets of files and triangular can be filed serrated, angle grinder is also a very good choice, stainless steel hardness is not high, files can be polished. File surface has many fine knife teeth, bars, for filing the workpiece hand tools. Used to do micro processing of metal, wood, leather and other surface. When filing an iron piece with a file, never file back. That is, either file forward or backward, so that it will be filed flat.