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R30008 Cobalt vs. AISI 418 Stainless Steel

R30008 cobalt belongs to the cobalt alloys classification, while AISI 418 stainless steel belongs to the iron alloys. They have a modest 30% 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 (11, in this case) are not shown.

For each property being compared, the top bar is R30008 cobalt and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 1.1 to 73
17
Fatigue Strength, MPa 320 to 530
520
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
77
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
1100
Tensile Strength: Yield (Proof), MPa 500 to 1080
850

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1400
1500
Melting Onset (Solidus), °C 1330
1460
Specific Heat Capacity, J/kg-K 450
470
Thermal Expansion, µm/m-K 13
10

Otherwise Unclassified Properties

Base Metal Price, % relative 95
15
Density, g/cm3 8.4
8.0
Embodied Carbon, kg CO2/kg material 8.1
2.9
Embodied Energy, MJ/kg 110
41
Embodied Water, L/kg 400
110

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 2720
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 31 to 56
38
Strength to Weight: Bending, points 25 to 37
29
Thermal Shock Resistance, points 25 to 44
40

Alloy Composition

Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0.15 to 0.2
Chromium (Cr), % 18.5 to 21.5
12 to 14
Cobalt (Co), % 39 to 42
0
Iron (Fe), % 7.6 to 20
78.5 to 83.6
Manganese (Mn), % 1.0 to 2.0
0 to 0.5
Molybdenum (Mo), % 6.5 to 7.5
0 to 0.5
Nickel (Ni), % 15 to 18
1.8 to 2.2
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 1.2
0 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.030
Tungsten (W), % 0
2.5 to 3.5