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Introduction of 317-317L Stainless Steel Pipe
Oct 18, 2017

Alloy 317L (UNS S31703) is a molybdenum-bearing low carbon content “L” grade austenitic stainless steel tube with greatly increased resistance to chemical attack as compared to the conventional chromium-nickel austenitic stainless steel pipe such as Alloy 304 and 316L. In addition, Alloy 317L offers higher creep, stress-to-rupture, and tensile strength at elevated temperatures than conventional stainless steel tubing, It is a low carbon or “L’’ grade which provides resistance to sensitization during welding and other thermal processes. 317L is non-magnetic in the annealed condition but may become slightly magnetic as a result of welding.


Chemical Composition

317

C

Mn

Si

Cr

Ni

Mo

P

S

Ni

Fe

0.03 max

2.0

0.75 max

18.00-20.00

11.00-15.00

3.00-4.00

0.04 max

0.03 max

0.10 max

Balance


317L

C

Mn

Si

Cr

Ni

Mo

P

S

Ni

Fe

0.03 max

2.0

0.75 max

17.00-20.00

13.50-17.50

4.00-5.00

0.04 max

0.03 max

0.10-0.20

Balance


Mechanical Properties

Grade

Tensile Strength (MPa)

Yield Strength 0.2% Proof (MPA) min

Elongation (% in 50mm) min

Hardness (Brinell)

317

515

205

40

95

317L

485

170

40

95


Application 

· Flue-gas desulfurization systems

· Chemical process vessels

· Petrochemical

· Pulp and Paper

· Condensers in power generation