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R30155 Cobalt vs. S33550 Stainless Steel

Both R30155 cobalt and S33550 stainless steel are iron alloys. They have 71% 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 S33550 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
190
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
40
Fatigue Strength, MPa 310
270
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 81
79
Shear Strength, MPa 570
470
Tensile Strength: Ultimate (UTS), MPa 850
680
Tensile Strength: Yield (Proof), MPa 390
310

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 570
470
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1470
1400
Melting Onset (Solidus), °C 1420
1360
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 14
16

Otherwise Unclassified Properties

Base Metal Price, % relative 80
24
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
4.3
Embodied Energy, MJ/kg 150
61
Embodied Water, L/kg 300
190

Common Calculations

PREN (Pitting Resistance) 37
30
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
220
Resilience: Unit (Modulus of Resilience), kJ/m3 370
250
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
24
Strength to Weight: Bending, points 24
22
Thermal Diffusivity, mm2/s 3.2
3.9
Thermal Shock Resistance, points 21
15

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.040 to 0.1
Cerium (Ce), % 0
0.025 to 0.070
Chromium (Cr), % 20 to 22.5
25 to 28
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
48.8 to 58.2
Lanthanum (La), % 0
0.025 to 0.070
Manganese (Mn), % 1.0 to 2.0
0 to 1.5
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
16.5 to 20
Niobium (Nb), % 0.75 to 1.3
0.050 to 0.15
Nitrogen (N), % 0 to 0.2
0.18 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0