Type 316 (UNS S31600), Type 316L (UNS S31603)

Description

Type 316/316L is a chromium nickel austenitic stainless steel containing molybdenum. The molybdenum addition enhances the corrosion resistance over that of 304/304L in halide environments as well as in reducing acids such as sulfuric and phosphoric acid. Type 316L can be dual certified as 316 when the composition meets the lower carbon limit of 316L and the slightly higher strength levels of 316. 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 316/316L 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 316/316L has excellent strength and toughness at cryogenic temperatures. Type 316/316L 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 A240 and ASME SA240*
Element 316 316L
Carbon 0.08 0.030 max
Chromium 16.0-18.0 16.0-18.0
Nickel 10.0-14.0 10.0-14.0
Molybdenum 2.00-3.00 2.00-3.00
Manganese 2.00 2.00
Silicon 0.75 0.75
Nitrogen 0.10 0.10
Phosphorus 0.045 0.045
Sulfur 0.030 0.030
* Maximum, unless range is indicated
Mechanical Properties
Mechanical property requirements for annealed product as specified in ASTM A240 and ASME SA240
Property 316 316L
Yield Strength, min. (ksi) 30 25
Tensile Strength, min. (ksi) 75 70
Elongation, min. (%) 40 40
Hardness, max. (Rb) 95 95

Mechanical property requirements for cold worked flat rolled products as specified in ASTM A666

Condition Yield Strength (ksi) min. Tensile Strength (ksi) min. Elongation % min. in 2 in.
<0.015 in. ≥0.015 in.
1/4 Hard 75 125 10 10
1/2 Hard 110 150 6 7
Physical Properties
Physical properties for Type 316/316L stainless steel
Property 316/316L Data
Density, lb/in3 0.290
Modulus of Elasticity, psi 29.0 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, Microohm-in 29.4
Standards
Typical standards for Type 316/316L stainless steel
316 316L
ASTM A240 ASTM A240
ASTM A666 ASTM A666
ASME SA240 ASME SA240
AMS 5524 AMS 5507

Data are typical, are provided for informational purposes, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice. We make no representation or warranty as to its accuracy and assume no duty to update. Actual data on any particular product or material may vary from those shown herein.  © 2014 RMP Inc. All rights reserved.