Type 316 (UNS S31600)


Type 316 is a chromium nickel austenitic stainless steel containing molybdenum.  The molybdenum addition enhances the corrosion resistance over that of 304 in halide environments as well as in reducing acids such as sulfuric and phosphoric acid.  Type 316 can be dual certified as 316L when the composition meets the lower carbon limit of 316L.  Type 316L should be specified for welded applications as the low carbon version eliminates chromium carbide precipitation and enhances the corrosion resistance in the as-welded condition.

Type 316 resists atmospheric corrosion as well as in moderately oxidizing environments.  It also resists corrosion in marine atmospheres and has excellent resistance to intergranular corrosion in the as-welded condition.  Type 316 has excellent strength and toughness at cryogenic temperatures.  Type 316 is non-magnetic in the annealed condition but may become slightly magnetic as a result of severe cold working.

Chemical Composition

Chemical Composition (wt%) limits as specified in ASTM A276 and ASME SA276*

Carbon 0.08 Manganese 2.00
Chromium 16.0-18.0 Silicon 1.00
Nickel 10.0-14.0 Phosphorus 0.045
Molybdenum 2.00-3.00 Sulfur 0.030

*Maximum, unless range is indicated

Physical Properties

Physical properties for Type 316 Stainless Steel

Density, lb/in3 0.290
Modulus of Elasticity, psi 29 x 106
Coefficient of Thermal Expansion, 68-212˚F, /˚F 9.2 x 10-6
Thermal Conductivity, Btu/ft hr ˚F 9.4
Specific Heat, Btu/lb ˚F 0.12
Electrical Resistivity, Microhm-in 29.4

Mechanical Properties

Mechanical property requirements for hot finished product as specified in ASTM A276 and ASME SA276

Yield Strength, min (ksi) 30
Tensile Strength, min (ksi) 75
Elongation, min (%) 40


Typical standards for Type 316 Stainless Steel