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AISI 418 Stainless Steel vs. R30003 Cobalt

AISI 418 stainless steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 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 AISI 418 stainless steel and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 17
10 to 73
Fatigue Strength, MPa 520
320 to 560
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
83
Tensile Strength: Ultimate (UTS), MPa 1100
970 to 1720
Tensile Strength: Yield (Proof), MPa 850
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Melting Completion (Liquidus), °C 1500
1400
Melting Onset (Solidus), °C 1460
1440
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 25
13
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
2.1

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 1830
600 to 2790
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 38
32 to 57
Strength to Weight: Bending, points 29
26 to 38
Thermal Diffusivity, mm2/s 6.7
3.3
Thermal Shock Resistance, points 40
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 0.15 to 0.2
0 to 0.15
Chromium (Cr), % 12 to 14
19 to 21
Cobalt (Co), % 0
39 to 41
Iron (Fe), % 78.5 to 83.6
10 to 20.5
Manganese (Mn), % 0 to 0.5
1.5 to 2.5
Molybdenum (Mo), % 0 to 0.5
6.0 to 8.0
Nickel (Ni), % 1.8 to 2.2
14 to 16
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 0.5
0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 2.5 to 3.5
0