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ACI-ASTM CB7Cu-2 Steel vs. R30008 Cobalt

ACI-ASTM CB7Cu-2 steel belongs to the iron alloys classification, while R30008 cobalt belongs to the cobalt alloys. They have a modest 34% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CB7Cu-2 steel and the bottom bar is R30008 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 5.7 to 11
1.1 to 73
Fatigue Strength, MPa 420 to 590
320 to 530
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
83
Tensile Strength: Ultimate (UTS), MPa 960 to 1350
950 to 1700
Tensile Strength: Yield (Proof), MPa 760 to 1180
500 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1430
1400
Melting Onset (Solidus), °C 1380
1330
Specific Heat Capacity, J/kg-K 480
450
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 13
95
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 2.6
8.1
Embodied Energy, MJ/kg 38
110
Embodied Water, L/kg 130
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 1510 to 3600
590 to 2720
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 34 to 48
31 to 56
Strength to Weight: Bending, points 28 to 35
25 to 37
Thermal Shock Resistance, points 32 to 45
25 to 44

Alloy Composition

Boron (B), % 0
0 to 0.0010
Carbon (C), % 0 to 0.070
0 to 0.15
Chromium (Cr), % 14 to 15.5
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Copper (Cu), % 2.5 to 3.2
0
Iron (Fe), % 73.6 to 79
7.6 to 20
Manganese (Mn), % 0 to 0.7
1.0 to 2.0
Molybdenum (Mo), % 0
6.5 to 7.5
Nickel (Ni), % 4.5 to 5.5
15 to 18
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 1.2
Sulfur (S), % 0 to 0.030
0 to 0.015