AWS ER80S-B8 or ER55S-B8 (S50480) Weld Metal
AWS ER80S-B8 is a weld metal formulated for joining alloy steels. Cited properties are appropriate for the post-weld heat treated (PWHT) condition. ER80S-B8 is the AWS designation for this material. S50480 is the UNS number. Older literature may refer to this material as ER505, but this is now discouraged.
It has a fairly high base cost among alloy steel welding fillers. In addition, it has a fairly high embodied energy and a fairly high electrical conductivity.
The graph bars on the material properties cards below compare AWS ER80S-B8 to: alloy steel welding fillers (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
190 GPa 28 x 106 psi
Elongation at Break
19 %
Poisson's Ratio
0.28
Shear Modulus
75 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
630 MPa 91 x 103 psi
Tensile Strength: Yield (Proof)
530 MPa 76 x 103 psi
Thermal Properties
Latent Heat of Fusion
270 J/g
Melting Completion (Liquidus)
1460 °C 2650 °F
Melting Onset (Solidus)
1410 °C 2580 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
26 W/m-K 15 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
8.1 % IACS
Electrical Conductivity: Equal Weight (Specific)
9.3 % IACS
Otherwise Unclassified Properties
Base Metal Price
6.5 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
2.0 kg CO2/kg material
Embodied Energy
28 MJ/kg 12 x 103 BTU/lb
Embodied Water
89 L/kg 11 gal/lb
Common Calculations
PREN (Pitting Resistance)
13
Resilience: Ultimate (Unit Rupture Work)
120 MJ/m3
Resilience: Unit (Modulus of Resilience)
720 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
22 points
Strength to Weight: Bending
21 points
Thermal Diffusivity
6.9 mm2/s
Thermal Shock Resistance
17 points
Alloy Composition
| Fe | 85.6 to 90.8 | |
| Cr | 8.0 to 10.5 | |
| Mo | 0.8 to 1.2 | |
| Mn | 0.4 to 0.7 | |
| Si | 0 to 0.5 | |
| Ni | 0 to 0.5 | |
| Cu | 0 to 0.35 | |
| C | 0 to 0.1 | |
| P | 0 to 0.025 | |
| S | 0 to 0.025 | |
| res. | 0 to 0.5 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
AWS A5.28: Specification for Low-Alloy Steel Electrodes and Rods for Gas Shielded Arc Welding
Welding Metallurgy, 2nd ed., Sindo Kou, 2003
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015