Not too many stainless alloys are great for forging and they tend to be really hard on abrasives after doing so because of the chromium oxides. Heating stainless causes some of that chromium to burn off, which can be a nasty fume.Always stand crosswind and have good ventilation while working. Can you forge stainless steel? You can and you should. Forging stainless steel is for the most part, counter productive. Stainless steels simply are not improved in any way via forging. It isn't easy, but more than a couple of bladesmiths and factories do it. It's a lot of trouble for what you get out of it. Flash is necessary metal in excess of that required to completely fill the finishing impression of the dies.