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AWS E310Mo (W31020) Weld Metal

AWS E310Mo is a weld metal formulated for joining stainless steels. Cited properties are appropriate for the as-welded condition. E310Mo is the AWS designation for this material. W31020 is the UNS number. Additionally, the ISO numeric designation is ES310Mo.

It has a moderately low thermal conductivity among stainless steel welding fillers. In addition, it has a moderately high base cost and a moderately high embodied energy.

The graph bars on the material properties cards below compare AWS E310Mo to: stainless 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

200 GPa 30 x 106 psi

Elongation at Break

34 %

Poisson's Ratio

0.27

Shear Modulus

80 GPa 12 x 106 psi

Tensile Strength: Ultimate (UTS)

620 MPa 89 x 103 psi

Thermal Properties

Latent Heat of Fusion

310 J/g

Melting Completion (Liquidus)

1420 °C 2590 °F

Melting Onset (Solidus)

1370 °C 2510 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

14 W/m-K 8.1 BTU/h-ft-°F

Thermal Expansion

14 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

28 % relative

Density

7.9 g/cm3 500 lb/ft3

Embodied Carbon

5.1 kg CO2/kg material

Embodied Energy

71 MJ/kg 31 x 103 BTU/lb

Embodied Water

210 L/kg 25 gal/lb

Common Calculations

PREN (Pitting Resistance)

35

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

22 points

Strength to Weight: Bending

20 points

Thermal Diffusivity

3.7 mm2/s

Thermal Shock Resistance

15 points

Alloy Composition

Iron (Fe) 42.8 to 52
Chromium (Cr) 25 to 28
Nickel (Ni) 20 to 22
Molybdenum (Mo) 2.0 to 3.0
Manganese (Mn) 1.0 to 2.5
Silicon (Si) 0 to 0.75
Copper (Cu) 0 to 0.75
Carbon (C) 0 to 0.12
Phosphorus (P) 0 to 0.030
Sulfur (S) 0 to 0.030

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

AWS A5.4: Specification for Stainless Steel Electrodes for Shielded Metal Arc Welding

Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005

Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015