R30021 Cobalt vs. AWS E320LR

R30021 cobalt belongs to the cobalt alloys classification, while AWS E320LR belongs to the iron 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 R30021 cobalt and the bottom bar is AWS E320LR.

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

Metric UnitsUS Customary Units

Mechanical Properties

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

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

Poisson's Ratio		0.29
Poisson's Ratio		0.28

Shear Modulus, GPa		86
Shear Modulus, GPa		77

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

Thermal Properties

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

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

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

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

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

Otherwise Unclassified Properties

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

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

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

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

Common Calculations

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

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

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

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

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

Alloy Composition

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

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

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

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

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

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

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

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

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

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

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

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