R31537 Cobalt vs. AWS E240

R31537 cobalt belongs to the cobalt alloys classification, while AWS E240 belongs to the iron alloys. They have a modest 20% 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 R31537 cobalt and the bottom bar is AWS E240.

Low Carbon Co-28Cr-6Mo Alloy (ASTM F1537 Alloy 1, ISO 5832-12 Alloy 1, R31537)AWS E240 (W32410) 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, %		14 to 23
Elongation at Break, %		17

Poisson's Ratio		0.29
Poisson's Ratio		0.28

Shear Modulus, GPa		87
Shear Modulus, GPa		77

Tensile Strength: Ultimate (UTS), MPa		1000 to 1340
Tensile Strength: Ultimate (UTS), MPa		770

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		1390

Melting Onset (Solidus), °C		1290
Melting Onset (Solidus), °C		1350

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		15

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		3.0

Embodied Energy, MJ/kg		110
Embodied Energy, MJ/kg		42

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		33 to 44
Strength to Weight: Axial, points		28

Strength to Weight: Bending, points		26 to 32
Strength to Weight: Bending, points		24

Thermal Diffusivity, mm²/s		3.4
Thermal Diffusivity, mm²/s		3.9

Thermal Shock Resistance, points		24 to 32
Thermal Shock Resistance, points		19

Alloy Composition

Carbon (C), %		0 to 0.14
Carbon (C), %		0 to 0.060

Chromium (Cr), %		26 to 30
Chromium (Cr), %		17 to 19

Cobalt (Co), %		58.9 to 69
Cobalt (Co), %		0

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

Iron (Fe), %		0 to 0.75
Iron (Fe), %		58.6 to 68.4

Manganese (Mn), %		0 to 1.0
Manganese (Mn), %		10.5 to 13.5

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

Nickel (Ni), %		0 to 1.0
Nickel (Ni), %		4.0 to 6.0

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