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R30008 Cobalt vs. ASTM A372 Grade C Steel

R30008 cobalt belongs to the cobalt alloys classification, while ASTM A372 grade C steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R30008 cobalt and the bottom bar is ASTM A372 grade C steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 1.1 to 73
17
Fatigue Strength, MPa 320 to 530
290
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 83
73
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
710
Tensile Strength: Yield (Proof), MPa 500 to 1080
430

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1330
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 95
1.8
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.4
Embodied Energy, MJ/kg 110
19
Embodied Water, L/kg 400
46

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 2720
500
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 31 to 56
25
Strength to Weight: Bending, points 25 to 37
23
Thermal Shock Resistance, points 25 to 44
22

Alloy Composition

Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0 to 0.48
Chromium (Cr), % 18.5 to 21.5
0
Cobalt (Co), % 39 to 42
0
Iron (Fe), % 7.6 to 20
97.5 to 99.85
Manganese (Mn), % 1.0 to 2.0
0 to 1.7
Molybdenum (Mo), % 6.5 to 7.5
0
Nickel (Ni), % 15 to 18
0
Phosphorus (P), % 0 to 0.015
0 to 0.015
Silicon (Si), % 0 to 1.2
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.010