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AWS ER80S-B2 or ER55S-B2 (K20900) Weld Metal

AWS ER80S-B2 is a weld metal formulated for joining alloy steels. Cited properties are appropriate for the post-weld heat treated (PWHT) condition. ER80S-B2 is the AWS designation for this material. K20900 is the UNS number.

It has a moderately low embodied energy and a moderately low base cost among alloy steel welding fillers.

The graph bars on the material properties cards below compare AWS ER80S-B2 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 27 x 10⁶ psi

Elongation at Break

21 %

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

620 MPa 89 x 10³ psi

Tensile Strength: Yield (Proof)

540 MPa 78 x 10³ psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2580 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

40 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.5 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

3.0 % relative

Density

7.8 g/cm³ 490 lb/ft³

Embodied Carbon

1.6 kg CO₂/kg material

Embodied Energy

21 MJ/kg 9.1 x 10³ BTU/lb

Embodied Water

54 L/kg 6.4 gal/lb

Common Calculations

PREN (Pitting Resistance)

3.1

Resilience: Ultimate (Unit Rupture Work)

130 MJ/m³

Resilience: Unit (Modulus of Resilience)

760 kJ/m³

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

22 points

Strength to Weight: Bending

21 points

Thermal Diffusivity

11 mm²/s

Thermal Shock Resistance

18 points

Alloy Composition

Iron (Fe)Fe		95.2 to 97.5
Chromium (Cr)Cr		1.2 to 1.5
Manganese (Mn)Mn		0.4 to 0.7
Silicon (Si)Si		0.4 to 0.7
Molybdenum (Mo)Mo		0.4 to 0.65
Copper (Cu)Cu		0 to 0.35
Nickel (Ni)Ni		0 to 0.2
Carbon (C)C		0.070 to 0.12
Phosphorus (P)P		0 to 0.025
Sulfur (S)S		0 to 0.025
Residualsres.		0 to 0.5