R31538 Cobalt vs. AWS E219

R31538 cobalt belongs to the cobalt alloys classification, while AWS E219 belongs to the iron alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is AWS E219.

High Carbon Co-28Cr-6Mo Alloy (ASTM F1537 Alloy 2, ISO 5832-12 Alloy 2, R31538)AWS E219 (W32310) 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, %		13 to 23
Elongation at Break, %		17

Poisson's Ratio		0.29
Poisson's Ratio		0.28

Shear Modulus, GPa		86
Shear Modulus, GPa		78

Tensile Strength: Ultimate (UTS), MPa		1020 to 1360
Tensile Strength: Ultimate (UTS), MPa		690

Thermal Properties

Latent Heat of Fusion, J/g		320
Latent Heat of Fusion, J/g		290

Melting Completion (Liquidus), °C		1360
Melting Completion (Liquidus), °C		1400

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

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

Thermal Conductivity, W/m-K		13
Thermal Conductivity, W/m-K		14

Thermal Expansion, µm/m-K		13
Thermal Expansion, µm/m-K		15

Otherwise Unclassified Properties

Density, g/cm³		8.4
Density, g/cm³		7.7

Embodied Carbon, kg CO₂/kg material		8.1
Embodied Carbon, kg CO₂/kg material		3.1

Embodied Energy, MJ/kg		110
Embodied Energy, MJ/kg		44

Embodied Water, L/kg		530
Embodied Water, L/kg		160

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		34 to 45
Strength to Weight: Axial, points		25

Strength to Weight: Bending, points		27 to 32
Strength to Weight: Bending, points		23

Thermal Diffusivity, mm²/s		3.5
Thermal Diffusivity, mm²/s		3.8

Thermal Shock Resistance, points		25 to 33
Thermal Shock Resistance, points		17

Alloy Composition

Carbon (C), %		0.15 to 0.35
Carbon (C), %		0 to 0.060

Chromium (Cr), %		26 to 30
Chromium (Cr), %		19 to 21.5

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

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

Iron (Fe), %		0 to 0.75
Iron (Fe), %		58.6 to 67.4

Manganese (Mn), %		0 to 1.0
Manganese (Mn), %		8.0 to 10

Molybdenum (Mo), %		5.0 to 7.0
Molybdenum (Mo), %		0 to 0.75

Nickel (Ni), %		0 to 1.0
Nickel (Ni), %		5.5 to 7.0

Nitrogen (N), %		0 to 0.25
Nitrogen (N), %		0.1 to 0.3

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