R30021 Cobalt vs. AWS E33-31

R30021 cobalt belongs to the cobalt alloys classification, while AWS E33-31 belongs to the iron alloys. They have a modest 33% 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 E33-31.

UNS R30021 Co-Cr-W Alloy AWS E33-31 (W33310) Weld Metal

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		220
Elastic (Young's, Tensile) Modulus, GPa		210

Elongation at Break, %		9.0
Elongation at Break, %		29

Poisson's Ratio		0.29
Poisson's Ratio		0.27

Shear Modulus, GPa		86
Shear Modulus, GPa		81

Tensile Strength: Ultimate (UTS), MPa		700
Tensile Strength: Ultimate (UTS), MPa		810

Thermal Properties

Latent Heat of Fusion, J/g		330
Latent Heat of Fusion, J/g		320

Melting Completion (Liquidus), °C		1350
Melting Completion (Liquidus), °C		1380

Melting Onset (Solidus), °C		1190
Melting Onset (Solidus), °C		1330

Specific Heat Capacity, J/kg-K		450
Specific Heat Capacity, J/kg-K		480

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

Otherwise Unclassified Properties

Density, g/cm³		8.4
Density, g/cm³		7.9

Embodied Carbon, kg CO₂/kg material		8.0
Embodied Carbon, kg CO₂/kg material		6.0

Embodied Energy, MJ/kg		110
Embodied Energy, MJ/kg		86

Embodied Water, L/kg		520
Embodied Water, L/kg		260

Common Calculations

Stiffness to Weight: Axial, points		15
Stiffness to Weight: Axial, points		14

Stiffness to Weight: Bending, points		24
Stiffness to Weight: Bending, points		25

Strength to Weight: Axial, points		23
Strength to Weight: Axial, points		28

Strength to Weight: Bending, points		21
Strength to Weight: Bending, points		24

Thermal Shock Resistance, points		21
Thermal Shock Resistance, points		19

Alloy Composition

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

Chromium (Cr), %		26 to 29
Chromium (Cr), %		31 to 35

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

Copper (Cu), %		0
Copper (Cu), %		0.4 to 0.8

Iron (Fe), %		0 to 3.0
Iron (Fe), %		24.7 to 34.8

Manganese (Mn), %		0
Manganese (Mn), %		2.5 to 4.0

Molybdenum (Mo), %		4.5 to 6.0
Molybdenum (Mo), %		1.0 to 2.0

Nickel (Ni), %		2.0 to 3.0
Nickel (Ni), %		30 to 32

Nitrogen (N), %		0
Nitrogen (N), %		0.3 to 0.5

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

Silicon (Si), %		0 to 1.5
Silicon (Si), %		0 to 0.9

Sulfur (S), %		0
Sulfur (S), %		0 to 0.010