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SAE-AISI 8620 Steel vs. R30155 Cobalt

Both SAE-AISI 8620 steel and R30155 cobalt are iron alloys. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 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 8620 steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 210
220
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 13 to 31
34
Fatigue Strength, MPa 270 to 360
310
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
81
Shear Strength, MPa 340 to 420
570
Tensile Strength: Ultimate (UTS), MPa 520 to 690
850
Tensile Strength: Yield (Proof), MPa 360 to 570
390

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 410
1100
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 39
12
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 1.5
9.7
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 50
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 86 to 150
230
Resilience: Unit (Modulus of Resilience), kJ/m3 340 to 880
370
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 18 to 24
28
Strength to Weight: Bending, points 18 to 22
24
Thermal Diffusivity, mm2/s 10
3.2
Thermal Shock Resistance, points 15 to 20
21

Alloy Composition

Carbon (C), % 0.18 to 0.23
0.080 to 0.16
Chromium (Cr), % 0.4 to 0.6
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 96.9 to 98
24.3 to 36.2
Manganese (Mn), % 0.7 to 0.9
1.0 to 2.0
Molybdenum (Mo), % 0.15 to 0.25
2.5 to 3.5
Nickel (Ni), % 0.4 to 0.7
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0