The alloy for ASTM A182 F316 Stainless Steel Flanges contains nonferrous elements such as chromium, nickel & molybdenum as primary alloyants. ASTM A182 F316 Flanges are an austenitic stainless steel flange that has been developed in order to provide improved corrosion resistance to both Alloy 304 as well as alloy 304L in moderately corrosive environments.