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Stainless Steel 316L Tubes

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Grade 316 is the standard molybdenum-bearing grade, second in importance to 304 amongst the austenitic stainless steels. The molybdenum gives 316 better overall corrosion resistant properties than Grade 304, particularly higher resistance to pitting and crevice corrosion in chloride environments.

Grade 316L, the low carbon version of 316 and is immune from sensitisation (grain boundary carbide precipitation). Thus it is extensively used in heavy gauge welded components (over about 6mm). There is commonly no appreciable price difference between 316 and 316L stainless steel.

The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures.

Compared to chromium-nickel austenitic stainless steels, 316L stainless steel offers higher creep, stress to rupture and tensile strength at elevated temperatures.

 

Composition

Table 1. Composition ranges for 316L stainless steels.

Grade

 

C

Mn

Si

P

 

Cr

Mo

Ni

N

316L

Min

-

-

-

-

-

16.0

2.00

10.0

-

Max

0.03

2.0

0.75

0.045

0.03

18.0

3.00

14.0

0.10

Mechanical Properties

Table 2. Mechanical properties of 316L stainless steels.

Grade

Tensile Str (MPa) min

Yield Str 0.2% Proof (MPa) min

Elong (% in 50mm) min

Hardness

Rockwell B (HR B) max

Brinell (HB) max

316L

485

170

40

95

217

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