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R30021 Cobalt vs. ASTM A356 Grade 10

R30021 cobalt belongs to the cobalt alloys classification, while ASTM A356 grade 10 belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is ASTM A356 grade 10.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
23
Fatigue Strength, MPa 250
300
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
74
Tensile Strength: Ultimate (UTS), MPa 700
670
Tensile Strength: Yield (Proof), MPa 500
430

Thermal Properties

Latent Heat of Fusion, J/g 330
260
Melting Completion (Liquidus), °C 1350
1470
Melting Onset (Solidus), °C 1190
1430
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
39
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.8

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.0
1.8
Embodied Energy, MJ/kg 110
23
Embodied Water, L/kg 520
59

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
130
Resilience: Unit (Modulus of Resilience), kJ/m3 570
480
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
24
Strength to Weight: Bending, points 21
22
Thermal Diffusivity, mm2/s 3.8
11
Thermal Shock Resistance, points 21
19

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.2
Chromium (Cr), % 26 to 29
2.0 to 2.8
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
94.4 to 96.6
Manganese (Mn), % 0
0.5 to 0.8
Molybdenum (Mo), % 4.5 to 6.0
0.9 to 1.2
Nickel (Ni), % 2.0 to 3.0
0
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 1.5
0 to 0.6
Sulfur (S), % 0
0 to 0.030