AWS E312 vs. R30006 Cobalt

AWS E312 belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt 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 (13, in this case) are not shown.

For each property being compared, the top bar is AWS E312 and the bottom bar is R30006 cobalt.

AWS E312 (W31310) Weld Metal UNS R30006 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, %		25
Elongation at Break, %		1.0

Poisson's Ratio		0.27
Poisson's Ratio		0.28

Shear Modulus, GPa		80
Shear Modulus, GPa		85

Tensile Strength: Ultimate (UTS), MPa		740
Tensile Strength: Ultimate (UTS), MPa		900

Thermal Properties

Latent Heat of Fusion, J/g		310
Latent Heat of Fusion, J/g		320

Melting Completion (Liquidus), °C		1410
Melting Completion (Liquidus), °C		1400

Melting Onset (Solidus), °C		1360
Melting Onset (Solidus), °C		1290

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

Thermal Expansion, µm/m-K		15
Thermal Expansion, µm/m-K		11

Otherwise Unclassified Properties

Density, g/cm³		7.7
Density, g/cm³		8.6

Embodied Carbon, kg CO₂/kg material		3.6
Embodied Carbon, kg CO₂/kg material		7.8

Embodied Energy, MJ/kg		52
Embodied Energy, MJ/kg		110

Embodied Water, L/kg		200
Embodied Water, L/kg		500

Common Calculations

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

Stiffness to Weight: Bending, points		25
Stiffness to Weight: Bending, points		23

Strength to Weight: Axial, points		27
Strength to Weight: Axial, points		29

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

Thermal Shock Resistance, points		18
Thermal Shock Resistance, points		26

Alloy Composition

Carbon (C), %		0 to 0.15
Carbon (C), %		0.9 to 1.4

Chromium (Cr), %		28 to 32
Chromium (Cr), %		27 to 32

Cobalt (Co), %		0
Cobalt (Co), %		48.6 to 68.1

Copper (Cu), %		0 to 0.75
Copper (Cu), %		0

Iron (Fe), %		52.3 to 63.5
Iron (Fe), %		0 to 3.0

Manganese (Mn), %		0.5 to 2.5
Manganese (Mn), %		0

Molybdenum (Mo), %		0 to 0.75
Molybdenum (Mo), %		0 to 1.0

Nickel (Ni), %		8.0 to 10.5
Nickel (Ni), %		0 to 3.0

Phosphorus (P), %		0 to 0.040
Phosphorus (P), %		0

Silicon (Si), %		0 to 1.0
Silicon (Si), %		0 to 2.0

Sulfur (S), %		0 to 0.030
Sulfur (S), %		0

Tungsten (W), %		0
Tungsten (W), %		4.0 to 6.0