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ACI-ASTM CN3M Steel vs. G-CoCr28 Cobalt

ACI-ASTM CN3M steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have 42% of their average alloy composition in common. There are 27 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 CN3M steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 34
6.7
Fatigue Strength, MPa 150
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 80
83
Tensile Strength: Ultimate (UTS), MPa 500
560
Tensile Strength: Yield (Proof), MPa 190
260

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Maximum Temperature: Mechanical, °C 1100
1200
Melting Completion (Liquidus), °C 1450
1330
Melting Onset (Solidus), °C 1400
1270
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 13
8.5
Thermal Expansion, µm/m-K 16
14

Otherwise Unclassified Properties

Base Metal Price, % relative 31
100
Density, g/cm3 8.1
8.1
Embodied Carbon, kg CO2/kg material 5.9
6.2
Embodied Energy, MJ/kg 80
84
Embodied Water, L/kg 200
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
31
Resilience: Unit (Modulus of Resilience), kJ/m3 89
160
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
19
Strength to Weight: Bending, points 17
19
Thermal Diffusivity, mm2/s 3.4
2.2
Thermal Shock Resistance, points 11
14

Alloy Composition

Carbon (C), % 0 to 0.030
0.050 to 0.25
Chromium (Cr), % 20 to 22
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 42.4 to 52.5
9.7 to 24.5
Manganese (Mn), % 0 to 2.0
0 to 1.5
Molybdenum (Mo), % 4.5 to 5.5
0 to 0.5
Nickel (Ni), % 23 to 27
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 1.0
0.5 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.030