>A quick check for "crap" stainless is put a magnet on it.  400 series
>stainless has iron in it, therefore, it is not as corriosn resistant as
>300 series and hence the magnetic properties.

ALL stainless steel is iron. Steels (stainless included) are alloys
based on iron, with various other metals and nonmetallic elements
added, including nickel (which is also magnetic, by the way).

Thr rusting stainless I have seen was nonmagnetic.
--
Andrew Grebneff
Dunedin
New Zealand
Fossil preparator
<andrew.grebneff@stonebow.otago.ac.nz>
Seashell, Macintosh, VW/Toyota van nut

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