Take a grinder or sanding disk and sand to bare metal. Put water on the
ground surface and see if it rusts. You might have to wait for some time.
If no rusting for a couple days then use a magnet to check for magnetic
attraction. If it is a 300 series stainless it will not be attracted to the
steel.

What makes you think they are stainless steel?


"Stratis" wrote in message
...
I've acquired three 50 gallon steel drums which I think were used in
hot
water systems.

I need to know whether or not they are stainless steel (as opposed to
non-stainless). How can I test them?

Stratis.