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Grade FDSiCr Steel vs. R30012 Cobalt

Grade FDSiCr steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. There are 22 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is grade FDSiCr steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 80
86
Tensile Strength: Ultimate (UTS), MPa 1930
830

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1440
1470
Melting Onset (Solidus), °C 1400
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 48
15
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.8
Embodied Carbon, kg CO2/kg material 1.5
8.3
Embodied Energy, MJ/kg 20
120
Embodied Water, L/kg 48
480

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 69
26
Strength to Weight: Bending, points 44
22
Thermal Diffusivity, mm2/s 13
3.8
Thermal Shock Resistance, points 58
23

Alloy Composition

Carbon (C), % 0.5 to 0.6
1.4 to 2.0
Chromium (Cr), % 0.5 to 0.8
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Copper (Cu), % 0 to 0.12
0
Iron (Fe), % 96.5 to 97.8
0 to 3.0
Manganese (Mn), % 0.5 to 0.9
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 1.2 to 1.6
0 to 2.0
Sulfur (S), % 0 to 0.025
0
Tungsten (W), % 0
7.5 to 9.5