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R30155 Cobalt vs. S32808 Stainless Steel

Both R30155 cobalt and S32808 stainless steel are iron alloys. They have 63% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is S32808 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
270
Elastic (Young's, Tensile) Modulus, GPa 210
210
Elongation at Break, % 34
17
Fatigue Strength, MPa 310
350
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 81
81
Shear Strength, MPa 570
480
Tensile Strength: Ultimate (UTS), MPa 850
780
Tensile Strength: Yield (Proof), MPa 390
570

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 570
460
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1470
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
14
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Base Metal Price, % relative 80
24
Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 9.7
4.0
Embodied Energy, MJ/kg 150
57
Embodied Water, L/kg 300
180

Common Calculations

PREN (Pitting Resistance) 37
40
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
120
Resilience: Unit (Modulus of Resilience), kJ/m3 370
790
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
27
Strength to Weight: Bending, points 24
24
Thermal Diffusivity, mm2/s 3.2
3.8
Thermal Shock Resistance, points 21
21

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.030
Chromium (Cr), % 20 to 22.5
27 to 27.9
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
58.1 to 62.8
Manganese (Mn), % 1.0 to 2.0
0 to 1.1
Molybdenum (Mo), % 2.5 to 3.5
0.8 to 1.2
Nickel (Ni), % 19 to 21
7.0 to 8.2
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0.3 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.010
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
2.1 to 2.5