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ACI-ASTM CB7Cu-1 Steel vs. G-CoCr28 Cobalt

ACI-ASTM CB7Cu-1 steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have a modest 37% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CB7Cu-1 steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 5.7 to 11
6.7
Fatigue Strength, MPa 420 to 590
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
83
Tensile Strength: Ultimate (UTS), MPa 960 to 1350
560
Tensile Strength: Yield (Proof), MPa 760 to 1180
260

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1430
1330
Melting Onset (Solidus), °C 1500
1270
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 17
8.5
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Base Metal Price, % relative 13
100
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 2.6
6.2
Embodied Energy, MJ/kg 38
84
Embodied Water, L/kg 130
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
31
Resilience: Unit (Modulus of Resilience), kJ/m3 1500 to 3590
160
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 34 to 48
19
Strength to Weight: Bending, points 28 to 35
19
Thermal Diffusivity, mm2/s 4.6
2.2
Thermal Shock Resistance, points 32 to 45
14

Alloy Composition

Carbon (C), % 0 to 0.070
0.050 to 0.25
Chromium (Cr), % 15.5 to 17.7
27 to 30
Cobalt (Co), % 0
48 to 52
Copper (Cu), % 2.5 to 3.2
0
Iron (Fe), % 72.3 to 78.4
9.7 to 24.5
Manganese (Mn), % 0 to 0.7
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 3.6 to 4.6
0 to 4.0
Niobium (Nb), % 0 to 0.35
0 to 0.5
Nitrogen (N), % 0 to 0.050
0
Phosphorus (P), % 0 to 0.035
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