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ACI-ASTM CE8MN Steel vs. R30155 Cobalt

Both ACI-ASTM CE8MN steel and R30155 cobalt are iron alloys. They have 65% of their average alloy composition in common. 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 ACI-ASTM CE8MN steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 29
34
Fatigue Strength, MPa 370
310
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
81
Tensile Strength: Ultimate (UTS), MPa 750
850
Tensile Strength: Yield (Proof), MPa 500
390

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 440
570
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1440
1470
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 16
12
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Base Metal Price, % relative 21
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 4.2
9.7
Embodied Energy, MJ/kg 58
150
Embodied Water, L/kg 180
300

Common Calculations

PREN (Pitting Resistance) 40
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
230
Resilience: Unit (Modulus of Resilience), kJ/m3 620
370
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 27
28
Strength to Weight: Bending, points 23
24
Thermal Diffusivity, mm2/s 4.2
3.2
Thermal Shock Resistance, points 21
21

Alloy Composition

Carbon (C), % 0 to 0.080
0.080 to 0.16
Chromium (Cr), % 22.5 to 25.5
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 56 to 66.4
24.3 to 36.2
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 3.0 to 4.5
2.5 to 3.5
Nickel (Ni), % 8.0 to 11
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0.1 to 0.3
0 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.5
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