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R30003 Cobalt vs. S35045 Stainless Steel

R30003 cobalt belongs to the cobalt alloys classification, while S35045 stainless steel belongs to the iron alloys. They have 52% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is R30003 cobalt and the bottom bar is S35045 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 10 to 73
39
Fatigue Strength, MPa 320 to 560
170
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
78
Tensile Strength: Ultimate (UTS), MPa 970 to 1720
540
Tensile Strength: Yield (Proof), MPa 510 to 1090
190

Thermal Properties

Latent Heat of Fusion, J/g 310
310
Melting Completion (Liquidus), °C 1400
1390
Melting Onset (Solidus), °C 1440
1340
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
12
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 95
34
Density, g/cm3 8.4
8.0
Embodied Carbon, kg CO2/kg material 8.0
5.8
Embodied Energy, MJ/kg 110
83
Embodied Water, L/kg 400
230

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 600 to 2790
94
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 32 to 57
19
Strength to Weight: Bending, points 26 to 38
19
Thermal Diffusivity, mm2/s 3.3
3.2
Thermal Shock Resistance, points 26 to 45
12

Alloy Composition

Aluminum (Al), % 0
0.15 to 0.6
Boron (B), % 0 to 0.1
0
Carbon (C), % 0 to 0.15
0.060 to 0.1
Chromium (Cr), % 19 to 21
25 to 29
Cobalt (Co), % 39 to 41
0
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 10 to 20.5
29.4 to 42.6
Manganese (Mn), % 1.5 to 2.5
0 to 1.5
Molybdenum (Mo), % 6.0 to 8.0
0
Nickel (Ni), % 14 to 16
32 to 37
Phosphorus (P), % 0 to 0.015
0 to 0.045
Silicon (Si), % 0 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015
Titanium (Ti), % 0
0.15 to 0.6