ER309L is very similar to ER309 except for the carbon content being lower than .03%.  The extra low carbon content provides good resistance to carbide precipitation and intergranular corrosion.  ER309L works well for dissimilar joints that undergo heat treatment.

AWS Specification           
AWS A5.9

AWS Classification            
ER309L

Welding Current
DCEP (Electrode Positive)

Typical Wire Chemistry
C         0.021
Si        0.51
Mn       1.75
Ni        12.70
Cr        23.40

Typical Mechanical Properties (As Welded)
Tensile Strength, psi            84,000
% Elongation in 2"                36

Welding Positions
All positions

Shielding Gas
Ar or Ar CO₂ mix

Available Diameters
.023", .030", .035", & .045" - GMAW
.035", .045", 1/16", 3/32", & 1/8" - GTAW

Operating Range In Amps
.023"   35 - 70
.030"   50 - 100
.035"   100 - 150
.045"   150 - 200

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