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SAE-AISI A8 Steel vs. R30003 Cobalt

SAE-AISI A8 steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A8 steel and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
83
Tensile Strength: Ultimate (UTS), MPa 700 to 1920
970 to 1720

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Melting Completion (Liquidus), °C 1480
1400
Melting Onset (Solidus), °C 1430
1440
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 37
13
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.3
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
2.1

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
95
Density, g/cm3 7.9
8.4
Embodied Carbon, kg CO2/kg material 2.3
8.0
Embodied Energy, MJ/kg 31
110
Embodied Water, L/kg 73
400

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 25 to 68
32 to 57
Strength to Weight: Bending, points 22 to 44
26 to 38
Thermal Diffusivity, mm2/s 9.9
3.3
Thermal Shock Resistance, points 22 to 62
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 0.5 to 0.6
0 to 0.15
Chromium (Cr), % 4.8 to 5.5
19 to 21
Cobalt (Co), % 0
39 to 41
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 88.5 to 91.9
10 to 20.5
Manganese (Mn), % 0 to 0.5
1.5 to 2.5
Molybdenum (Mo), % 1.2 to 1.7
6.0 to 8.0
Nickel (Ni), % 0 to 0.3
14 to 16
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0.75 to 1.1
0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 1.0 to 1.5
0

Comparable Variants