MG,
You are correct, you do not use ordinary carbon steel discs for grinding or sanding. You need to have discs classified as "iron free". There are a variety of discs you can use but the important thing to remember is keep them separated, do not use on s/s after you have used it on c/s, no matter what it is made of.
Regards,
Shane
I don't know if I should start another thread with this but I was wondering about this topic earlier today, what about titanium?
Which is worse for titanium, carbides or oxides?
Interjecting...
-Clif