The best way to approach the problem is to run IRs on everything in the
steel process and compare your unknown. Having said that, many suppliers
won't tell you everything that is in their product.
On the other hand, here is a wild idea for you. Check out silicones
(start with polydimethylsiloxane, but expand from there). The are
some siloxanes that are used to treat steel, as well.
Don't know that it will work, but it is worth a try.
Good luck.