R31539 Cobalt vs. EN 1.4740 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while EN 1.4740 stainless steel belongs to the iron alloys. There are 19 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is EN 1.4740 stainless steel.

Dispersion Strengthened Co-28Cr-6Mo Alloy (ASTM F1537 Alloy 3, R31539)EN 1.4740 (GX40CrSi17) Cast Stainless Steel

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 22
Elongation at Break, %		22

Poisson's Ratio		0.29
Poisson's Ratio		0.28

Shear Modulus, GPa		86
Shear Modulus, GPa		77

Thermal Properties

Latent Heat of Fusion, J/g		320
Latent Heat of Fusion, J/g		300

Melting Completion (Liquidus), °C		1360
Melting Completion (Liquidus), °C		1420

Melting Onset (Solidus), °C		1290
Melting Onset (Solidus), °C		1370

Specific Heat Capacity, J/kg-K		450
Specific Heat Capacity, J/kg-K		490

Thermal Conductivity, W/m-K		13
Thermal Conductivity, W/m-K		18

Thermal Expansion, µm/m-K		13
Thermal Expansion, µm/m-K		10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		2.0
Electrical Conductivity: Equal Volume, % IACS		2.2

Electrical Conductivity: Equal Weight (Specific), % IACS		2.1
Electrical Conductivity: Equal Weight (Specific), % IACS		2.6

Otherwise Unclassified Properties

Density, g/cm³		8.4
Density, g/cm³		7.6

Embodied Carbon, kg CO₂/kg material		8.2
Embodied Carbon, kg CO₂/kg material		2.3

Embodied Energy, MJ/kg		110
Embodied Energy, MJ/kg		32

Embodied Water, L/kg		530
Embodied Water, L/kg		120

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

Thermal Diffusivity, mm²/s		3.5
Thermal Diffusivity, mm²/s		4.8

Alloy Composition

Aluminum (Al), %		0.3 to 1.0
Aluminum (Al), %		0

Carbon (C), %		0 to 0.14
Carbon (C), %		0.3 to 0.5

Chromium (Cr), %		26 to 30
Chromium (Cr), %		16 to 19

Cobalt (Co), %		57.7 to 68.7
Cobalt (Co), %		0

Iron (Fe), %		0 to 0.75
Iron (Fe), %		75.4 to 82.7

Lanthanum (La), %		0.030 to 0.2
Lanthanum (La), %		0

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

Molybdenum (Mo), %		5.0 to 7.0
Molybdenum (Mo), %		0 to 0.5

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

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), %		1.0 to 2.5

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