S. Barker wrote:
Incidentally, true stainless is infact non magnetic. True stainless has no
iron in it. So if it's got iron in it, it's not much of a stainless steel.

That's simply incorrect on both counts -- there are many SS alloys that
aren't ferromagnetic, but all SS has iron in -- the preponderance is Fe.

Here's a composition for SS 304--

Cr 19%
Ni 9.0
C 0.08 max
Fe (balance)

--