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SAE-AISI A9 Steel vs. R30816 Cobalt

SAE-AISI A9 steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt 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 SAE-AISI A9 steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 74
81
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
1020

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1460
1540
Melting Onset (Solidus), °C 1410
1460
Specific Heat Capacity, J/kg-K 470
420
Thermal Conductivity, W/m-K 35
13
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.1
Embodied Carbon, kg CO2/kg material 4.7
20
Embodied Energy, MJ/kg 70
320
Embodied Water, L/kg 82
440

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 28 to 73
31
Strength to Weight: Bending, points 24 to 46
25
Thermal Diffusivity, mm2/s 9.6
3.3
Thermal Shock Resistance, points 25 to 66
28

Alloy Composition

Carbon (C), % 0.45 to 0.55
0.32 to 0.42
Chromium (Cr), % 4.8 to 5.5
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87 to 90.5
0 to 5.0
Manganese (Mn), % 0 to 0.5
1.0 to 2.0
Molybdenum (Mo), % 1.3 to 1.8
3.5 to 4.5
Nickel (Ni), % 1.3 to 1.8
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 1.0 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5
Vanadium (V), % 0.8 to 1.4
0