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R31539 Cobalt vs. EN 1.4729 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while EN 1.4729 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 1.4729 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 22
15
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
75

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1420
Melting Onset (Solidus), °C 1290
1380
Specific Heat Capacity, J/kg-K 450
490
Thermal Conductivity, W/m-K 13
24
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
3.3

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.6
Embodied Carbon, kg CO2/kg material 8.2
2.1
Embodied Energy, MJ/kg 110
29
Embodied Water, L/kg 530
100

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Thermal Diffusivity, mm2/s 3.5
6.5

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.3 to 0.5
Chromium (Cr), % 26 to 30
12 to 14
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
80.4 to 86.7
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.5
Nickel (Ni), % 0 to 1.0
0 to 1.0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
1.0 to 2.5
Sulfur (S), % 0
0 to 0.030