In the seal business it is a serious problem if you use stainless steel springs or stainless steel bellows material. This is the main reason that Hastelloy C is recommended for spring material. The 300 series is the one most commonly used in the process industry because of its good corrosion resistant proprieties. Outside of water chloride is the most common chemical found in nature and remember that the most common water treatment is the addition of chlorine. Beware of insulating or painting stainless steel pipe.
Most insulation contains plenty of chlorides and piping is frequently under tensile stress.
The worst condition would be insulated steam traced, stainless steel piping. If it is necessary to insulate stainless steel pipe a special chloride free insulation can be purchased or the pipe can be coated with a protective film prior to insulating. Stress cracking can be minimized by annealing the metal, after manufacture to remove residual manufactured stresses. Never replace a carbon steel bolt with a stainless steel one unless you are sure there are no chlorides present. Bolts can be under severe tensile stress.