MakeItFrom.com
Menu (ESC)

SAE-AISI A8 Steel vs. R30816 Cobalt

SAE-AISI A8 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 A8 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 700 to 1920
1020

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Melting Completion (Liquidus), °C 1480
1540
Melting Onset (Solidus), °C 1430
1460
Specific Heat Capacity, J/kg-K 470
420
Thermal Conductivity, W/m-K 37
13
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 7.9
9.1
Embodied Carbon, kg CO2/kg material 2.3
20
Embodied Energy, MJ/kg 31
320
Embodied Water, L/kg 73
440

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 25 to 68
31
Strength to Weight: Bending, points 22 to 44
25
Thermal Diffusivity, mm2/s 9.9
3.3
Thermal Shock Resistance, points 22 to 62
28

Alloy Composition

Carbon (C), % 0.5 to 0.6
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), % 88.5 to 91.9
0 to 5.0
Manganese (Mn), % 0 to 0.5
1.0 to 2.0
Molybdenum (Mo), % 1.2 to 1.7
3.5 to 4.5
Nickel (Ni), % 0 to 0.3
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.75 to 1.1
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 1.0 to 1.5
3.5 to 4.5