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R30008 Cobalt vs. S20910 Stainless Steel

R30008 cobalt belongs to the cobalt alloys classification, while S20910 stainless steel belongs to the iron alloys. They have 50% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30008 cobalt and the bottom bar is S20910 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 1.1 to 73
14 to 39
Fatigue Strength, MPa 320 to 530
310 to 460
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
79
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
780 to 940
Tensile Strength: Yield (Proof), MPa 500 to 1080
430 to 810

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1400
1420
Melting Onset (Solidus), °C 1330
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 95
22
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
4.8
Embodied Energy, MJ/kg 110
68
Embodied Water, L/kg 400
180

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 2720
460 to 1640
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 31 to 56
28 to 33
Strength to Weight: Bending, points 25 to 37
24 to 27
Thermal Shock Resistance, points 25 to 44
17 to 21

Alloy Composition

Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0 to 0.060
Chromium (Cr), % 18.5 to 21.5
20.5 to 23.5
Cobalt (Co), % 39 to 42
0
Iron (Fe), % 7.6 to 20
52.1 to 62.1
Manganese (Mn), % 1.0 to 2.0
4.0 to 6.0
Molybdenum (Mo), % 6.5 to 7.5
1.5 to 3.0
Nickel (Ni), % 15 to 18
11.5 to 13.5
Niobium (Nb), % 0
0.1 to 0.3
Nitrogen (N), % 0
0.2 to 0.4
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 1.2
0 to 0.75
Sulfur (S), % 0 to 0.015
0 to 0.030
Vanadium (V), % 0
0.1 to 0.3

Comparable Variants