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R30816 Cobalt vs. SAE-AISI A4 Steel

R30816 cobalt belongs to the cobalt alloys classification, while SAE-AISI A4 steel belongs to the iron alloys. There are 20 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 R30816 cobalt and the bottom bar is SAE-AISI A4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 81
73
Tensile Strength: Ultimate (UTS), MPa 1020
710 to 2050

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Melting Completion (Liquidus), °C 1540
1450
Melting Onset (Solidus), °C 1460
1410
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 13
40
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.8
Embodied Carbon, kg CO2/kg material 20
1.8
Embodied Energy, MJ/kg 320
24
Embodied Water, L/kg 440
59

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 31
25 to 73
Strength to Weight: Bending, points 25
23 to 46
Thermal Diffusivity, mm2/s 3.3
11
Thermal Shock Resistance, points 28
23 to 67

Alloy Composition

Carbon (C), % 0.32 to 0.42
1.0 to 1.1
Chromium (Cr), % 19 to 21
0.9 to 2.2
Cobalt (Co), % 40 to 49.8
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 5.0
92 to 95.5
Manganese (Mn), % 1.0 to 2.0
1.8 to 2.2
Molybdenum (Mo), % 3.5 to 4.5
0.9 to 1.4
Nickel (Ni), % 19 to 21
0 to 0.3
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0