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ACI-ASTM CF3M Steel vs. G-CoCr28 Cobalt

ACI-ASTM CF3M steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have a modest 40% of their average alloy composition in common, which, by itself, doesn't mean much. 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 CF3M 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, % 55
6.7
Fatigue Strength, MPa 270
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
83
Tensile Strength: Ultimate (UTS), MPa 520
560
Tensile Strength: Yield (Proof), MPa 260
260

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Maximum Temperature: Mechanical, °C 990
1200
Melting Completion (Liquidus), °C 1440
1330
Melting Onset (Solidus), °C 1430
1270
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 16
8.5
Thermal Expansion, µm/m-K 15
14

Otherwise Unclassified Properties

Base Metal Price, % relative 19
100
Density, g/cm3 7.9
8.1
Embodied Carbon, kg CO2/kg material 3.8
6.2
Embodied Energy, MJ/kg 53
84
Embodied Water, L/kg 160
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
31
Resilience: Unit (Modulus of Resilience), kJ/m3 170
160
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18
19
Strength to Weight: Bending, points 18
19
Thermal Diffusivity, mm2/s 4.3
2.2
Thermal Shock Resistance, points 12
14

Alloy Composition

Carbon (C), % 0 to 0.030
0.050 to 0.25
Chromium (Cr), % 17 to 21
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 59.9 to 72
9.7 to 24.5
Manganese (Mn), % 0 to 1.5
0 to 1.5
Molybdenum (Mo), % 2.0 to 3.0
0 to 0.5
Nickel (Ni), % 9.0 to 13
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.5
0.5 to 1.5
Sulfur (S), % 0 to 0.040
0 to 0.030