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ACI-ASTM CN7M Steel vs. R30008 Cobalt

ACI-ASTM CN7M steel belongs to the iron alloys classification, while R30008 cobalt belongs to the cobalt alloys. They have 54% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN7M steel and the bottom bar is R30008 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 44
1.1 to 73
Fatigue Strength, MPa 190
320 to 530
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
83
Tensile Strength: Ultimate (UTS), MPa 480
950 to 1700
Tensile Strength: Yield (Proof), MPa 200
500 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1410
1400
Melting Onset (Solidus), °C 1450
1330
Specific Heat Capacity, J/kg-K 470
450
Thermal Expansion, µm/m-K 15
13

Otherwise Unclassified Properties

Base Metal Price, % relative 32
95
Density, g/cm3 8.1
8.4
Embodied Carbon, kg CO2/kg material 5.6
8.1
Embodied Energy, MJ/kg 78
110
Embodied Water, L/kg 210
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 110
590 to 2720
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
31 to 56
Strength to Weight: Bending, points 17
25 to 37
Thermal Shock Resistance, points 12
25 to 44

Alloy Composition

Boron (B), % 0
0 to 0.0010
Carbon (C), % 0 to 0.070
0 to 0.15
Chromium (Cr), % 19 to 22
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Copper (Cu), % 3.0 to 4.0
0
Iron (Fe), % 37.4 to 48.5
7.6 to 20
Manganese (Mn), % 0 to 1.5
1.0 to 2.0
Molybdenum (Mo), % 2.0 to 3.0
6.5 to 7.5
Nickel (Ni), % 27.5 to 30.5
15 to 18
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 1.5
0 to 1.2
Sulfur (S), % 0 to 0.040
0 to 0.015