Na the 300 series rust as well, badly in some cases but are usually used in food proccessing were salt water/decomposing matter/cleaning acids/galvanic corrosion all come in to play....even where no salt water or cleaning acids poor design can cause bad corrosion of 304 and 316......dont look to hard at fish and chip shops... there saving grace is food is cooked!
But yes they are more corrosion resistant than the 400 series more commonly used in firearm manufacture to get some strength. 316 has the strength of a reheated cheeseburger.
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