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SAE-AISI A8 Steel vs. R30008 Cobalt

SAE-AISI A8 steel belongs to the iron alloys classification, while R30008 cobalt belongs to the cobalt alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A8 steel and the bottom bar is R30008 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
950 to 1700

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1480
1400
Melting Onset (Solidus), °C 1430
1330
Specific Heat Capacity, J/kg-K 470
450
Thermal Expansion, µm/m-K 12
13

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
8.1
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
31 to 56
Strength to Weight: Bending, points 22 to 44
25 to 37
Thermal Shock Resistance, points 22 to 62
25 to 44

Alloy Composition

Boron (B), % 0
0 to 0.0010
Carbon (C), % 0.5 to 0.6
0 to 0.15
Chromium (Cr), % 4.8 to 5.5
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 88.5 to 91.9
7.6 to 20
Manganese (Mn), % 0 to 0.5
1.0 to 2.0
Molybdenum (Mo), % 1.2 to 1.7
6.5 to 7.5
Nickel (Ni), % 0 to 0.3
15 to 18
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