300 series stainless is non magnetic, while 400 series IS magnetic. I think it has to do with whether or not there is any nickel content.
Non-magnetic Stainless Steel?
Any metallurgists out there? I assume that this magic feat is done by the trace elements added to produce various kinds of steel, but I thought that ALL steel was magnetic. Does anyone know which trace elements and the different proportions of these trace elements that can transform regular stainless steel into non-magnetic stainless?