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R30012 Cobalt vs. ASTM A321 Carbon Steel

R30012 cobalt belongs to the cobalt alloys classification, while ASTM A321 carbon steel 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 R30012 cobalt and the bottom bar is ASTM A321 carbon steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 1.0
21
Fatigue Strength, MPa 320
270
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 830
670
Tensile Strength: Yield (Proof), MPa 650
390

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1280
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 15
51
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.1

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.8
Embodied Carbon, kg CO2/kg material 8.3
1.4
Embodied Energy, MJ/kg 120
18
Embodied Water, L/kg 480
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
120
Resilience: Unit (Modulus of Resilience), kJ/m3 960
400
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26
24
Strength to Weight: Bending, points 22
22
Thermal Diffusivity, mm2/s 3.8
14
Thermal Shock Resistance, points 23
21

Alloy Composition

Carbon (C), % 1.4 to 2.0
0 to 0.55
Chromium (Cr), % 27 to 32
0
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
98.1 to 99.25
Manganese (Mn), % 0
0.6 to 0.9
Molybdenum (Mo), % 0 to 1.0
0
Nickel (Ni), % 0 to 3.0
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.050
Tungsten (W), % 7.5 to 9.5
0