R31538 Cobalt vs. AWS BVAg-18

R31538 cobalt belongs to the cobalt alloys classification, while AWS BVAg-18 belongs to the otherwise unclassified metals. There are 17 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 R31538 cobalt and the bottom bar is AWS BVAg-18.

High Carbon Co-28Cr-6Mo Alloy (ASTM F1537 Alloy 2, ISO 5832-12 Alloy 2, R31538)AWS BVAg-18 (P07607) Vacuum Service Filler Metal

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		220
Elastic (Young's, Tensile) Modulus, GPa		82

Poisson's Ratio		0.29
Poisson's Ratio		0.36

Shear Modulus, GPa		86
Shear Modulus, GPa		30

Tensile Strength: Ultimate (UTS), MPa		1020 to 1360
Tensile Strength: Ultimate (UTS), MPa		180

Thermal Properties

Latent Heat of Fusion, J/g		320
Latent Heat of Fusion, J/g		140

Melting Completion (Liquidus), °C		1360
Melting Completion (Liquidus), °C		720

Melting Onset (Solidus), °C		1290
Melting Onset (Solidus), °C		600

Specific Heat Capacity, J/kg-K		450
Specific Heat Capacity, J/kg-K		280

Thermal Expansion, µm/m-K		13
Thermal Expansion, µm/m-K		19

Otherwise Unclassified Properties

Density, g/cm³		8.4
Density, g/cm³		9.7

Embodied Carbon, kg CO₂/kg material		8.1
Embodied Carbon, kg CO₂/kg material		59

Embodied Energy, MJ/kg		110
Embodied Energy, MJ/kg		930

Common Calculations

Stiffness to Weight: Axial, points		15
Stiffness to Weight: Axial, points		4.7

Stiffness to Weight: Bending, points		24
Stiffness to Weight: Bending, points		15

Strength to Weight: Axial, points		34 to 45
Strength to Weight: Axial, points		5.1

Strength to Weight: Bending, points		27 to 32
Strength to Weight: Bending, points		7.3

Thermal Shock Resistance, points		25 to 33
Thermal Shock Resistance, points		8.1

Alloy Composition

Cadmium (Cd), %		0
Cadmium (Cd), %		0 to 0.0010

Carbon (C), %		0.15 to 0.35
Carbon (C), %		0 to 0.0050

Chromium (Cr), %		26 to 30
Chromium (Cr), %		0

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

Copper (Cu), %		0
Copper (Cu), %		28.5 to 31.5

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

Lead (Pb), %		0
Lead (Pb), %		0 to 0.0020

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

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

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

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

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.0020

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

Silver (Ag), %		0
Silver (Ag), %		59 to 61

Tin (Sn), %		0
Tin (Sn), %		9.5 to 10.5

Zinc (Zn), %		0
Zinc (Zn), %		0 to 0.0010