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R30155 Cobalt vs. S32101 Stainless Steel

Both R30155 cobalt and S32101 stainless steel are iron alloys. They have 56% 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 S32101 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
260
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
34
Fatigue Strength, MPa 310
400
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
78
Shear Strength, MPa 570
490
Tensile Strength: Ultimate (UTS), MPa 850
740
Tensile Strength: Yield (Proof), MPa 390
500

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 570
430
Maximum Temperature: Mechanical, °C 1100
1000
Melting Completion (Liquidus), °C 1470
1420
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Base Metal Price, % relative 80
12
Density, g/cm3 8.5
7.7
Embodied Carbon, kg CO2/kg material 9.7
2.6
Embodied Energy, MJ/kg 150
38
Embodied Water, L/kg 300
150

Common Calculations

PREN (Pitting Resistance) 37
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
230
Resilience: Unit (Modulus of Resilience), kJ/m3 370
640
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
4.0
Thermal Shock Resistance, points 21
20

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.040
Chromium (Cr), % 20 to 22.5
21 to 22
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
0.1 to 0.8
Iron (Fe), % 24.3 to 36.2
67.3 to 73.3
Manganese (Mn), % 1.0 to 2.0
4.0 to 6.0
Molybdenum (Mo), % 2.5 to 3.5
0.1 to 0.8
Nickel (Ni), % 19 to 21
1.4 to 1.7
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0.2 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