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ACI-ASTM CB7Cu-1 Steel vs. R30035 Cobalt

ACI-ASTM CB7Cu-1 steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 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 CB7Cu-1 steel and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220 to 230
Elongation at Break, % 5.7 to 11
9.0 to 46
Fatigue Strength, MPa 420 to 590
170 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
84 to 89
Tensile Strength: Ultimate (UTS), MPa 960 to 1350
900 to 1900
Tensile Strength: Yield (Proof), MPa 760 to 1180
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1430
1440
Melting Onset (Solidus), °C 1500
1320
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 17
11
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 13
100
Density, g/cm3 7.8
8.7
Embodied Carbon, kg CO2/kg material 2.6
10
Embodied Energy, MJ/kg 38
140
Embodied Water, L/kg 130
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 1500 to 3590
210 to 5920
Stiffness to Weight: Axial, points 14
14 to 15
Stiffness to Weight: Bending, points 25
23 to 24
Strength to Weight: Axial, points 34 to 48
29 to 61
Strength to Weight: Bending, points 28 to 35
24 to 39
Thermal Diffusivity, mm2/s 4.6
3.0
Thermal Shock Resistance, points 32 to 45
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.070
0 to 0.025
Chromium (Cr), % 15.5 to 17.7
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 2.5 to 3.2
0
Iron (Fe), % 72.3 to 78.4
0 to 1.0
Manganese (Mn), % 0 to 0.7
0 to 0.15
Molybdenum (Mo), % 0
9.0 to 10.5
Nickel (Ni), % 3.6 to 4.6
33 to 37
Niobium (Nb), % 0 to 0.35
0
Nitrogen (N), % 0 to 0.050
0
Phosphorus (P), % 0 to 0.035
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 0.15
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 1.0