ER308SI

Class: ER308SI
AWS: A5.9

Conforms to Certification: AWS A5.9 | ASME SFA A5.9

Weld Process Used for Mig: (GMAW) and Submerged Arc (SAW)

AWS Chemical Composition
C = 0.08 max Cr = 19.5 – 22.0
Ni = 9.0 – 11.0 Mo = 0.75 max
Mn 1.0 – 2.5 Si = 0.65 – 1.00
P = 0.03 max S = 0.03 max
Cu = 0.75 max

Available Sizes

Diameter X Spool Sizes Diameter X Coil Sizes
.025 x 2#, 10#, 25# 5/64 x mill coil
.030 x 2#, 10#, 25#, 33# 3/32 x 60# & mill coil
.035 x 2#, 10#, 25#, 33# 1/8 x 60# & mill coil
.045 x 2#, 10#, 25#, 33# 3/16 x 60# & mill coil
1/16 x 10#, 25#, 33# also 60# coil 5/32 x 60# & mill coil

Application
ER308SI is suitable for joining stainless steels of type 304 and 347. It is the same as ER308 but has a higher silicon content.

Deposited Chemical Composition % (Typical)
C = 0.05 Si = 0.72 Mn = 1.70
P = 0.011 S = 0.009 Cr = 20.0
Ni = 10.0
Mechanical Properties (R.T.) 
Tensile Strength 87,000 psi
Yield Strength 57,000 psi
Elongation 34%
Reduction of Area 56%

Deposited All Weld Metal Properties
Data is typical for ER308SI weld metal deposited by Mig using Argon + 2% oxygen as the shielding gas. Data on sub-arc is not presented, as sub-arc is dependent on the type of flux used.

Recommended Welding Parameters

GMAW “Mig Process” Reversed Polarity
Wire Diameter Wire Feed Amps Volts Shielding Gas Gas CFH
Short Arc Welding .030 13-26 40-120 16-20 Argon+2% O2 25
.035 13-26 60-140 16-22 Argon+2% O2 25
Spray Are Welding .035 20-39 140-220 24-29 Argon+2% O2 38
.045 16-30 160-260 25-30 Argon+2% O2 38
1/16 10-16 230-350 27-31 Argon+2% O2 38

Other shielding Gases may be used for Mig welding. Shielding gases are chosen taking Quality, Cost, and Operability into consideration

Recommended Welding Parameters

SAW “Submerged Arc Welding Process” Reversed Polarity Suggested
Wire Diameter Amps Volts
3/32 250-450 28-32
1/8 300-500 29-34
5/32 400-600 30-35
3/16 500-700 30-35

Both Agglomerated and fused fluxes can be used for submerged arc welding.

Note: The chemical composition of the flux mainly affects the chemistry of the weld metal and consequently its corrosion resistance and Mechanical properties.