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R30155 Cobalt vs. S44537 Stainless Steel

Both R30155 cobalt and S44537 stainless steel are iron alloys. They have 55% 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 S44537 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
180
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
21
Fatigue Strength, MPa 310
230
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 81
79
Shear Strength, MPa 570
320
Tensile Strength: Ultimate (UTS), MPa 850
510
Tensile Strength: Yield (Proof), MPa 390
360

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 570
530
Maximum Temperature: Mechanical, °C 1100
1000
Melting Completion (Liquidus), °C 1470
1480
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 12
21
Thermal Expansion, µm/m-K 14
11

Otherwise Unclassified Properties

Base Metal Price, % relative 80
19
Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 9.7
3.4
Embodied Energy, MJ/kg 150
50
Embodied Water, L/kg 300
140

Common Calculations

PREN (Pitting Resistance) 37
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
95
Resilience: Unit (Modulus of Resilience), kJ/m3 370
320
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
18
Strength to Weight: Bending, points 24
18
Thermal Diffusivity, mm2/s 3.2
5.6
Thermal Shock Resistance, points 21
17

Alloy Composition

Aluminum (Al), % 0
0 to 0.1
Carbon (C), % 0.080 to 0.16
0 to 0.030
Chromium (Cr), % 20 to 22.5
20 to 24
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 24.3 to 36.2
69 to 78.6
Lanthanum (La), % 0
0.040 to 0.2
Manganese (Mn), % 1.0 to 2.0
0 to 0.8
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
0 to 0.5
Niobium (Nb), % 0.75 to 1.3
0.2 to 1.0
Nitrogen (N), % 0 to 0.2
0 to 0.040
Phosphorus (P), % 0 to 0.040
0 to 0.050
Silicon (Si), % 0 to 1.0
0.1 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.0060
Tantalum (Ta), % 0.75 to 1.3
0
Titanium (Ti), % 0
0.020 to 0.2
Tungsten (W), % 2.0 to 3.0
1.0 to 3.0