MakeItFrom.com
Menu (ESC)

R30021 Cobalt vs. Grey Cast Iron

R30021 cobalt belongs to the cobalt alloys classification, while grey cast iron belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 1300
570 to 1290
Elastic (Young's, Tensile) Modulus, GPa 220
180
Elongation at Break, % 9.0
9.6
Fatigue Strength, MPa 250
69 to 170
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
69
Tensile Strength: Ultimate (UTS), MPa 700
160 to 450
Tensile Strength: Yield (Proof), MPa 500
98 to 290

Thermal Properties

Latent Heat of Fusion, J/g 330
280
Melting Completion (Liquidus), °C 1350
1380
Melting Onset (Solidus), °C 1190
1180
Specific Heat Capacity, J/kg-K 450
490
Thermal Conductivity, W/m-K 15
46
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.9

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.5
Embodied Carbon, kg CO2/kg material 8.0
1.5
Embodied Energy, MJ/kg 110
21
Embodied Water, L/kg 520
44

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
13 to 37
Resilience: Unit (Modulus of Resilience), kJ/m3 570
27 to 240
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
5.8 to 17
Strength to Weight: Bending, points 21
8.7 to 17
Thermal Diffusivity, mm2/s 3.8
13
Thermal Shock Resistance, points 21
6.0 to 17

Alloy Composition

Carbon (C), % 0.2 to 0.35
3.1 to 3.4
Chromium (Cr), % 26 to 29
0
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
92.1 to 93.9
Manganese (Mn), % 0
0.5 to 0.7
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Phosphorus (P), % 0
0 to 0.9
Silicon (Si), % 0 to 1.5
2.5 to 2.8
Sulfur (S), % 0
0 to 0.15