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R30003 Cobalt vs. S21640 Stainless Steel

R30003 cobalt belongs to the cobalt alloys classification, while S21640 stainless steel belongs to the iron alloys. They have 43% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R30003 cobalt and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 10 to 73
46
Fatigue Strength, MPa 320 to 560
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
78
Tensile Strength: Ultimate (UTS), MPa 970 to 1720
740
Tensile Strength: Yield (Proof), MPa 510 to 1090
350

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1440
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 95
17
Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.0
3.6
Embodied Energy, MJ/kg 110
51
Embodied Water, L/kg 400
150

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 600 to 2790
300
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 32 to 57
27
Strength to Weight: Bending, points 26 to 38
23
Thermal Diffusivity, mm2/s 3.3
4.0
Thermal Shock Resistance, points 26 to 45
16

Alloy Composition

Boron (B), % 0 to 0.1
0
Carbon (C), % 0 to 0.15
0 to 0.080
Chromium (Cr), % 19 to 21
17.5 to 19.5
Cobalt (Co), % 39 to 41
0
Iron (Fe), % 10 to 20.5
63 to 74.3
Manganese (Mn), % 1.5 to 2.5
3.5 to 6.5
Molybdenum (Mo), % 6.0 to 8.0
0.5 to 2.0
Nickel (Ni), % 14 to 16
4.0 to 6.5
Niobium (Nb), % 0
0.1 to 1.0
Nitrogen (N), % 0
0.080 to 0.3
Phosphorus (P), % 0 to 0.015
0 to 0.060
Silicon (Si), % 0 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030