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R30003 Cobalt vs. S30815 Stainless Steel

R30003 cobalt belongs to the cobalt alloys classification, while S30815 stainless steel belongs to the iron alloys. They have 47% of their average alloy composition in common. There are 27 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 R30003 cobalt and the bottom bar is S30815 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 10 to 73
45
Fatigue Strength, MPa 320 to 560
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
77
Tensile Strength: Ultimate (UTS), MPa 970 to 1720
680
Tensile Strength: Yield (Proof), MPa 510 to 1090
350

Thermal Properties

Latent Heat of Fusion, J/g 310
310
Melting Completion (Liquidus), °C 1400
1400
Melting Onset (Solidus), °C 1440
1360
Specific Heat Capacity, J/kg-K 450
490
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 95
17
Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.0
3.3
Embodied Energy, MJ/kg 110
47
Embodied Water, L/kg 400
160

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 600 to 2790
310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 32 to 57
25
Strength to Weight: Bending, points 26 to 38
22
Thermal Diffusivity, mm2/s 3.3
4.0
Thermal Shock Resistance, points 26 to 45
15

Alloy Composition

Boron (B), % 0 to 0.1
0
Carbon (C), % 0 to 0.15
0.050 to 0.1
Cerium (Ce), % 0
0.030 to 0.080
Chromium (Cr), % 19 to 21
20 to 22
Cobalt (Co), % 39 to 41
0
Iron (Fe), % 10 to 20.5
62.8 to 68.4
Manganese (Mn), % 1.5 to 2.5
0 to 0.8
Molybdenum (Mo), % 6.0 to 8.0
0
Nickel (Ni), % 14 to 16
10 to 12
Nitrogen (N), % 0
0.14 to 0.2
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 1.2
1.4 to 2.0
Sulfur (S), % 0 to 0.015
0 to 0.030