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R30003 Cobalt vs. S43940 Stainless Steel

R30003 cobalt belongs to the cobalt alloys classification, while S43940 stainless steel belongs to the iron alloys. They have a modest 34% 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 R30003 cobalt and the bottom bar is S43940 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 10 to 73
21
Fatigue Strength, MPa 320 to 560
180
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
77
Tensile Strength: Ultimate (UTS), MPa 970 to 1720
490
Tensile Strength: Yield (Proof), MPa 510 to 1090
280

Thermal Properties

Latent Heat of Fusion, J/g 310
280
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1440
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
25
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 95
12
Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.0
2.6
Embodied Energy, MJ/kg 110
38
Embodied Water, L/kg 400
120

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 600 to 2790
200
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 32 to 57
18
Strength to Weight: Bending, points 26 to 38
18
Thermal Diffusivity, mm2/s 3.3
6.8
Thermal Shock Resistance, points 26 to 45
18

Alloy Composition

Boron (B), % 0 to 0.1
0
Carbon (C), % 0 to 0.15
0 to 0.030
Chromium (Cr), % 19 to 21
17.5 to 18.5
Cobalt (Co), % 39 to 41
0
Iron (Fe), % 10 to 20.5
78.2 to 82.1
Manganese (Mn), % 1.5 to 2.5
0 to 1.0
Molybdenum (Mo), % 6.0 to 8.0
0
Nickel (Ni), % 14 to 16
0
Niobium (Nb), % 0
0.3 to 0.6
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015
Titanium (Ti), % 0
0.1 to 0.6