Marine Stainless Steel Grade 316 Physical Properties
SS 316, the second most common grade (after 304), is alloy addition of molybdenum prevents specific forms of corrosion. It is also known as marine grade stainless steel due to its increased resistance to chloride corrosion compared to type 304. 316 is often used for building nuclear reprocessing plants.
Density: 0.799g/cm3
Electrical resistivity: 74 microhm-cm (20C)
Specific Heat: 0.50 kJ/kg-K (0-100°C)
Thermal conductivity: 16.2 W/m-k (100°C)
Modulus of Elasticity (MPa): 193 x 103 in tension
Melting Range: 2500-2550°F (1371-1399°C)
316 SS can be used 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. Type 316 is also austenitic, non-magnetic, and thermally nonhardenable stainless steel like Type 304. The carbon content is held to 0.08% maximum, while 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 by many industrial chemicals and solvents, and, in particular, inhibits pitting caused by chlorides. As such, molybdenum is one of the single most useful alloying additives in the fight against corrosion.
SS 316 is the main stainless used in the marine environment, with the exception of fasteners and other items where strength and wear resistance are needed, then Type 304 (18-8) is typically used.