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R30155 Cobalt vs. S44536 Stainless Steel

Both R30155 cobalt and S44536 stainless steel are iron alloys. They have 53% 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 S44536 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
170
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
22
Fatigue Strength, MPa 310
190
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 81
78
Shear Strength, MPa 570
290
Tensile Strength: Ultimate (UTS), MPa 850
460
Tensile Strength: Yield (Proof), MPa 390
280

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 570
560
Maximum Temperature: Mechanical, °C 1100
990
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
21
Thermal Expansion, µm/m-K 14
11

Otherwise Unclassified Properties

Base Metal Price, % relative 80
13
Density, g/cm3 8.5
7.7
Embodied Carbon, kg CO2/kg material 9.7
2.8
Embodied Energy, MJ/kg 150
41
Embodied Water, L/kg 300
140

Common Calculations

PREN (Pitting Resistance) 37
22
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
89
Resilience: Unit (Modulus of Resilience), kJ/m3 370
200
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
17
Strength to Weight: Bending, points 24
17
Thermal Diffusivity, mm2/s 3.2
5.6
Thermal Shock Resistance, points 21
16

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.015
Chromium (Cr), % 20 to 22.5
20 to 23
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
72.8 to 80
Manganese (Mn), % 1.0 to 2.0
0 to 1.0
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
0 to 0.5
Niobium (Nb), % 0.75 to 1.3
0.050 to 0.8
Nitrogen (N), % 0 to 0.2
0 to 0.015
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
Titanium (Ti), % 0
0 to 0.8
Tungsten (W), % 2.0 to 3.0
0