R31538 Cobalt vs. AWS ERNiMo-3

R31538 cobalt belongs to the cobalt alloys classification, while AWS ERNiMo-3 belongs to the nickel alloys. There are 18 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 R31538 cobalt and the bottom bar is AWS ERNiMo-3.

High Carbon Co-28Cr-6Mo Alloy (ASTM F1537 Alloy 2, ISO 5832-12 Alloy 2, R31538)AWS ERNiMo-3 Weld Metal

Metric UnitsUS Customary Units

Mechanical Properties

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

Poisson's Ratio		0.29
Poisson's Ratio		0.3

Shear Modulus, GPa		86
Shear Modulus, GPa		83

Tensile Strength: Ultimate (UTS), MPa		1020 to 1360
Tensile Strength: Ultimate (UTS), MPa		770

Thermal Properties

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

Melting Completion (Liquidus), °C		1360
Melting Completion (Liquidus), °C		1600

Melting Onset (Solidus), °C		1290
Melting Onset (Solidus), °C		1540

Specific Heat Capacity, J/kg-K		450
Specific Heat Capacity, J/kg-K		400

Thermal Expansion, µm/m-K		13
Thermal Expansion, µm/m-K		11

Otherwise Unclassified Properties

Density, g/cm³		8.4
Density, g/cm³		9.1

Embodied Carbon, kg CO₂/kg material		8.1
Embodied Carbon, kg CO₂/kg material		15

Embodied Energy, MJ/kg		110
Embodied Energy, MJ/kg		190

Embodied Water, L/kg		530
Embodied Water, L/kg		270

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		22

Strength to Weight: Axial, points		34 to 45
Strength to Weight: Axial, points		24

Strength to Weight: Bending, points		27 to 32
Strength to Weight: Bending, points		21

Thermal Shock Resistance, points		25 to 33
Thermal Shock Resistance, points		24

Alloy Composition

Carbon (C), %		0.15 to 0.35
Carbon (C), %		0 to 0.12

Chromium (Cr), %		26 to 30
Chromium (Cr), %		4.0 to 6.0

Cobalt (Co), %		58.7 to 68.9
Cobalt (Co), %		0 to 2.5

Copper (Cu), %		0
Copper (Cu), %		0 to 0.5

Iron (Fe), %		0 to 0.75
Iron (Fe), %		4.0 to 7.0

Manganese (Mn), %		0 to 1.0
Manganese (Mn), %		0 to 1.0

Molybdenum (Mo), %		5.0 to 7.0
Molybdenum (Mo), %		23 to 26

Nickel (Ni), %		0 to 1.0
Nickel (Ni), %		53.7 to 69

Nitrogen (N), %		0 to 0.25
Nitrogen (N), %		0

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

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

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

Tungsten (W), %		0
Tungsten (W), %		0 to 1.0

Vanadium (V), %		0
Vanadium (V), %		0 to 0.6

Residuals, %		0
Residuals, %		0 to 0.5