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ACI-ASTM CD6MN Steel vs. G-CoCr28 Cobalt

ACI-ASTM CD6MN steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have 46% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CD6MN 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, % 28
6.7
Fatigue Strength, MPa 370
130
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 80
83
Tensile Strength: Ultimate (UTS), MPa 730
560
Tensile Strength: Yield (Proof), MPa 510
260

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Maximum Temperature: Mechanical, °C 1100
1200
Melting Completion (Liquidus), °C 1440
1330
Melting Onset (Solidus), °C 1390
1270
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
8.5
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Base Metal Price, % relative 17
100
Density, g/cm3 7.7
8.1
Embodied Carbon, kg CO2/kg material 3.4
6.2
Embodied Energy, MJ/kg 48
84
Embodied Water, L/kg 170
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
31
Resilience: Unit (Modulus of Resilience), kJ/m3 650
160
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 26
19
Strength to Weight: Bending, points 23
19
Thermal Diffusivity, mm2/s 4.4
2.2
Thermal Shock Resistance, points 20
14

Alloy Composition

Carbon (C), % 0 to 0.060
0.050 to 0.25
Chromium (Cr), % 24 to 27
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 62.1 to 70.1
9.7 to 24.5
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 1.8 to 2.5
0 to 0.5
Nickel (Ni), % 4.0 to 6.0
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Nitrogen (N), % 0.15 to 0.25
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0.5 to 1.5
Sulfur (S), % 0 to 0.040
0 to 0.030