ER502

Class: ER502
AWS: A5.9

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

AWS Chemical Composition Requirements
C = 0.10 max
Cr = 4.6 – 6.0
Ni = 0.60 max
Mo = 0.45 – 0.65
Mn = 0.60 max
Si = 0.50 max
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# 1/16 x 60# & mill coil
.030 x 2#, 10#, 25#, 30#, 33# 5/64 x 60# & mill coil
.035 x 2#, 10#, 25#, 30#, 33# 3/32 x 60# & mill coil
.045 x 2#, 10#, 25#, 30#, 33# 1/8 x 60# & mill coil
1/16 x 10#, 25#, 30#, 33# 3/16 x 60# & mill coil
5/32 x 60# & mill coil

Application
ER502 is used for welding 502 base materials, frequently tube or pipe. Preheating and post-weld heat treatment is required.

Deposited Chemical Composition % (Typical)
C = 0.07 Mo = 5.0 P = 0.015
Cr = 5.45 Mn = 0.44 S = 0.006
Ni = 0.45 Si = 0.04 Cu = 0.20
Mechanical Properties (R.T.) 
Yield Strength 60,500psi
Tensile Strength 78,500psi
Elongation 32%

Deposited All Weld Metal Properties
Data is typical for ER502 weld metal deposited by Mig using Argon + 2% oxygen as the shielding gas. Data on 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 Arc 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.