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ACI-ASTM CN7M Steel vs. G-CoCr28 Cobalt

ACI-ASTM CN7M steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have 41% 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 CN7M 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, % 44
6.7
Fatigue Strength, MPa 190
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
83
Tensile Strength: Ultimate (UTS), MPa 480
560
Tensile Strength: Yield (Proof), MPa 200
260

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Maximum Temperature: Mechanical, °C 1100
1200
Melting Completion (Liquidus), °C 1410
1330
Melting Onset (Solidus), °C 1450
1270
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 21
8.5
Thermal Expansion, µm/m-K 15
14

Otherwise Unclassified Properties

Base Metal Price, % relative 32
100
Density, g/cm3 8.1
8.1
Embodied Carbon, kg CO2/kg material 5.6
6.2
Embodied Energy, MJ/kg 78
84
Embodied Water, L/kg 210
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
31
Resilience: Unit (Modulus of Resilience), kJ/m3 110
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 5.6
2.2
Thermal Shock Resistance, points 12
14

Alloy Composition

Carbon (C), % 0 to 0.070
0.050 to 0.25
Chromium (Cr), % 19 to 22
27 to 30
Cobalt (Co), % 0
48 to 52
Copper (Cu), % 3.0 to 4.0
0
Iron (Fe), % 37.4 to 48.5
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), % 27.5 to 30.5
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