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R30008 Cobalt vs. S32050 Stainless Steel

R30008 cobalt belongs to the cobalt alloys classification, while S32050 stainless steel belongs to the iron alloys. They have 58% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R30008 cobalt and the bottom bar is S32050 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
210
Elongation at Break, % 1.1 to 73
46
Fatigue Strength, MPa 320 to 530
340
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
81
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
770
Tensile Strength: Yield (Proof), MPa 500 to 1080
370

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1330
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 95
31
Density, g/cm3 8.4
8.0
Embodied Carbon, kg CO2/kg material 8.1
6.0
Embodied Energy, MJ/kg 110
81
Embodied Water, L/kg 400
210

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 2720
330
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 31 to 56
27
Strength to Weight: Bending, points 25 to 37
23
Thermal Shock Resistance, points 25 to 44
17

Alloy Composition

Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0 to 0.030
Chromium (Cr), % 18.5 to 21.5
22 to 24
Cobalt (Co), % 39 to 42
0
Copper (Cu), % 0
0 to 0.4
Iron (Fe), % 7.6 to 20
43.1 to 51.8
Manganese (Mn), % 1.0 to 2.0
0 to 1.5
Molybdenum (Mo), % 6.5 to 7.5
6.0 to 6.6
Nickel (Ni), % 15 to 18
20 to 23
Nitrogen (N), % 0
0.21 to 0.32
Phosphorus (P), % 0 to 0.015
0 to 0.035
Silicon (Si), % 0 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.020