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R30155 Cobalt vs. N08031 Stainless Steel

Both R30155 cobalt and N08031 stainless steel are iron alloys. They have 76% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is N08031 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
210
Elongation at Break, % 34
45
Fatigue Strength, MPa 310
290
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
81
Shear Strength, MPa 570
510
Tensile Strength: Ultimate (UTS), MPa 850
730
Tensile Strength: Yield (Proof), MPa 390
310

Thermal Properties

Latent Heat of Fusion, J/g 300
310
Maximum Temperature: Corrosion, °C 570
460
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 450
460
Thermal Conductivity, W/m-K 12
12
Thermal Expansion, µm/m-K 14
18

Otherwise Unclassified Properties

Base Metal Price, % relative 80
39
Density, g/cm3 8.5
8.1
Embodied Carbon, kg CO2/kg material 9.7
7.1
Embodied Energy, MJ/kg 150
96
Embodied Water, L/kg 300
240

Common Calculations

PREN (Pitting Resistance) 37
52
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
270
Resilience: Unit (Modulus of Resilience), kJ/m3 370
230
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
25
Strength to Weight: Bending, points 24
22
Thermal Diffusivity, mm2/s 3.2
3.1
Thermal Shock Resistance, points 21
14

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.015
Chromium (Cr), % 20 to 22.5
26 to 28
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
1.0 to 1.4
Iron (Fe), % 24.3 to 36.2
29 to 36.9
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 2.5 to 3.5
6.0 to 7.0
Nickel (Ni), % 19 to 21
30 to 32
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0.15 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 0.3
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
0