49234 by Midland | Schedule 40 Welded Nipple | 4" Diameter x 6" Length | 316 Stainless SteelFeatures: For severe environments. Of course, there are many industrial processes that require a higher level of resistance to corrosion than Type 304 can offer. For these applications, Type 316 is the answer. In type 316, the nickel content is increased slightly. What distinguishes Type 316 from Type 304 is the addition of molybdenum up to a maximum of 3%. Molybdenum increases the corrosion resistance of this chromium nickel alloy to withstand attack