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R30008 Cobalt vs. S21900 Stainless Steel

R30008 cobalt belongs to the cobalt alloys classification, while S21900 stainless steel belongs to the iron alloys. They have 42% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R30008 cobalt and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 1.1 to 73
50
Fatigue Strength, MPa 320 to 530
380
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
78
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
710
Tensile Strength: Yield (Proof), MPa 500 to 1080
390

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1400
1400
Melting Onset (Solidus), °C 1330
1350
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 13
17

Otherwise Unclassified Properties

Base Metal Price, % relative 95
15
Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.1
3.0
Embodied Energy, MJ/kg 110
43
Embodied Water, L/kg 400
160

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 2720
380
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 31 to 56
26
Strength to Weight: Bending, points 25 to 37
23
Thermal Shock Resistance, points 25 to 44
15

Alloy Composition

Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0 to 0.080
Chromium (Cr), % 18.5 to 21.5
19 to 21.5
Cobalt (Co), % 39 to 42
0
Iron (Fe), % 7.6 to 20
59.4 to 67.4
Manganese (Mn), % 1.0 to 2.0
8.0 to 10
Molybdenum (Mo), % 6.5 to 7.5
0
Nickel (Ni), % 15 to 18
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
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 0.030