Magnetic stainless is the…
Magnetic stainless is the cheapest stainless there is. It is thin and has ferris metal in the mix. I'm not positive that the magnet had anything other then alignment of the molecular make up. Of course if the stainless alloy is not properly taken care of ie a corrosion preventative coating. It will rust. Just like any exposed steel. Look at your cheap stainless appliances after time without proper maintenance it rust. Good non magnetic stainless will last two life times even if not properly maintained.