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AWS ER120S-1 or ER83S-1 (K21030) Weld Metal

AWS ER120S-1 is a weld metal formulated for joining alloy steels. Cited properties are appropriate for the as-welded condition. ER120S-1 is the AWS designation for this material. K21030 is the UNS number.

It has a fairly low ductility among alloy steel welding fillers. In addition, it has a very high tensile strength and a moderately high embodied energy.

The graph bars on the material properties cards below compare AWS ER120S-1 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

17 %

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

930 MPa 130 x 103 psi

Tensile Strength: Yield (Proof)

830 MPa 120 x 103 psi

Thermal Properties

Latent Heat of Fusion

260 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

46 W/m-K 27 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.8 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.0 % IACS

Otherwise Unclassified Properties

Base Metal Price

4.2 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.9 kg CO2/kg material

Embodied Energy

25 MJ/kg 11 x 103 BTU/lb

Embodied Water

56 L/kg 6.7 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

150 MJ/m3

Resilience: Unit (Modulus of Resilience)

1850 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

33 points

Strength to Weight: Bending

27 points

Thermal Diffusivity

13 mm2/s

Thermal Shock Resistance

27 points

Alloy Composition

Iron (Fe) 92.4 to 96.1
Nickel (Ni) 2.0 to 2.8
Manganese (Mn) 1.4 to 1.8
Molybdenum (Mo) 0.3 to 0.65
Silicon (Si) 0.25 to 0.6
Chromium (Cr) 0 to 0.6
Copper (Cu) 0 to 0.25
Carbon (C) 0 to 0.1
Aluminum (Al) 0 to 0.1
Titanium (Ti) 0 to 0.1
Zirconium (Zr) 0 to 0.1
Vanadium (V) 0 to 0.030
Phosphorus (P) 0 to 0.010
Sulfur (S) 0 to 0.010
Residuals 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