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

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

Type 316 (UNS S31600), Type 316L (UNS S31603) Stainless Steel 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...
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Type 316 (UNS S31600), Type 316L (UNS S31603) Stainless Steel

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


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