AWS E320LR vs. R30021 Cobalt

AWS E320LR belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 27% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is AWS E320LR and the bottom bar is R30021 cobalt.

AWS E320LR (W88022) Weld Metal UNS R30021 Co-Cr-W Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		200
Elastic (Young's, Tensile) Modulus, GPa		220

Elongation at Break, %		34
Elongation at Break, %		9.0

Poisson's Ratio		0.28
Poisson's Ratio		0.29

Shear Modulus, GPa		77
Shear Modulus, GPa		86

Tensile Strength: Ultimate (UTS), MPa		580
Tensile Strength: Ultimate (UTS), MPa		700

Thermal Properties

Latent Heat of Fusion, J/g		300
Latent Heat of Fusion, J/g		330

Melting Completion (Liquidus), °C		1410
Melting Completion (Liquidus), °C		1350

Melting Onset (Solidus), °C		1360
Melting Onset (Solidus), °C		1190

Specific Heat Capacity, J/kg-K		460
Specific Heat Capacity, J/kg-K		450

Thermal Expansion, µm/m-K		14
Thermal Expansion, µm/m-K		11

Otherwise Unclassified Properties

Density, g/cm³		8.2
Density, g/cm³		8.4

Embodied Carbon, kg CO₂/kg material		6.2
Embodied Carbon, kg CO₂/kg material		8.0

Embodied Energy, MJ/kg		87
Embodied Energy, MJ/kg		110

Embodied Water, L/kg		220
Embodied Water, L/kg		520

Common Calculations

Stiffness to Weight: Axial, points		13
Stiffness to Weight: Axial, points		15

Stiffness to Weight: Bending, points		24
Stiffness to Weight: Bending, points		24

Strength to Weight: Axial, points		20
Strength to Weight: Axial, points		23

Strength to Weight: Bending, points		19
Strength to Weight: Bending, points		21

Thermal Shock Resistance, points		15
Thermal Shock Resistance, points		21

Alloy Composition

Carbon (C), %		0 to 0.030
Carbon (C), %		0.2 to 0.35

Chromium (Cr), %		19 to 21
Chromium (Cr), %		26 to 29

Cobalt (Co), %		0
Cobalt (Co), %		61.7 to 67.3

Copper (Cu), %		3.0 to 4.0
Copper (Cu), %		0

Iron (Fe), %		32.7 to 42.5
Iron (Fe), %		0 to 3.0

Manganese (Mn), %		1.5 to 2.5
Manganese (Mn), %		0

Molybdenum (Mo), %		2.0 to 3.0
Molybdenum (Mo), %		4.5 to 6.0

Nickel (Ni), %		32 to 36
Nickel (Ni), %		2.0 to 3.0

Niobium (Nb), %		0 to 0.4
Niobium (Nb), %		0

Phosphorus (P), %		0 to 0.020
Phosphorus (P), %		0

Silicon (Si), %		0 to 0.3
Silicon (Si), %		0 to 1.5

Sulfur (S), %		0 to 0.015
Sulfur (S), %		0