316 Stainless Steel:
316 Stainless Steel is used when the product will be exposed to a corrosive environment. Edstrom Industries uses 316 stainless steel in applications where high levels of chlorine or hydrochloric acid are added to the drinking water. 316 stainless steel is also used when the product is connected to other equipment, such as chlorinators or bottle fillers, and spills or fumes may contact the sheet metal.
Edstrom Industries uses 316 stainless steel for animal drinking valves, fittings, and tubing in room distribution systems and rack manifolds. 316 stainless steel is specified at any location where the drinking water may flow through. This is done in case the customer adds chlorine to the water, or if the customer uses tap water. (Tap water may be acidic and have high levels of organic material, which can cause corrosion.)
316 stainless steel contains molybdenum, and the nickel content in 316 is 10% (compared to the 8% nickel content found in 314 stainless steel). Molybdenum, in conjunction with chromium, provides superior resistance to corrosion due to chlorides. The increased nickel content aids in repassivation of the passive film in case of damage.
Note, however, that 316 stainless steel is subject to attack if very high levels of chlorine are used for extended periods of time. If 50 PPM and above is used in the system and let stand in the system for longer than 3 or 4 hours, pitting will occur, as the chlorides will attack it, especially in cracks and crevices.
316 stainless steel is non-magnetic. Its machinability is similar to 304 stainless steel, and its material cost is 50% to 100% more than 303 or 304 stainless steel.
316 Resists to corrosion in a wider number of chemical products than 304. This nuance is not compatible with thermal hardening. Good compatibility with all current modes of welding. Pulp and paper machinery, heater exchanger, material of dyeing, propeller, elements in contact with sea air and marine environment.