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R30012 Cobalt vs. SAE-AISI D5 Steel

R30012 cobalt belongs to the cobalt alloys classification, while SAE-AISI D5 steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is SAE-AISI D5 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 1.0
5.4 to 14
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
75
Tensile Strength: Ultimate (UTS), MPa 830
770 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1470
1430
Melting Onset (Solidus), °C 1280
1390
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 15
27
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
4.2
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
4.9

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.7
Embodied Carbon, kg CO2/kg material 8.3
3.5
Embodied Energy, MJ/kg 120
51
Embodied Water, L/kg 480
120

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
28 to 73
Strength to Weight: Bending, points 22
24 to 46
Thermal Diffusivity, mm2/s 3.8
7.4
Thermal Shock Resistance, points 23
26 to 67

Alloy Composition

Carbon (C), % 1.4 to 2.0
1.4 to 1.6
Chromium (Cr), % 27 to 32
11 to 13
Cobalt (Co), % 47.5 to 64.1
2.5 to 3.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
77.9 to 84.4
Manganese (Mn), % 0
0 to 0.6
Molybdenum (Mo), % 0 to 1.0
0.7 to 1.2
Nickel (Ni), % 0 to 3.0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 2.0
0 to 0.6
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 7.5 to 9.5
0
Vanadium (V), % 0
0 to 1.0