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R30155 Cobalt vs. S44800 Stainless Steel

Both R30155 cobalt and S44800 stainless steel are iron alloys. They have 57% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is S44800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
190
Elastic (Young's, Tensile) Modulus, GPa 210
210
Elongation at Break, % 34
23
Fatigue Strength, MPa 310
300
Poisson's Ratio 0.29
0.27
Reduction in Area, % 34
45
Shear Modulus, GPa 81
82
Shear Strength, MPa 570
370
Tensile Strength: Ultimate (UTS), MPa 850
590
Tensile Strength: Yield (Proof), MPa 390
450

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 570
460
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
17
Thermal Expansion, µm/m-K 14
11

Otherwise Unclassified Properties

Base Metal Price, % relative 80
19
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
3.8
Embodied Energy, MJ/kg 150
52
Embodied Water, L/kg 300
190

Common Calculations

PREN (Pitting Resistance) 37
42
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
120
Resilience: Unit (Modulus of Resilience), kJ/m3 370
480
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
21
Strength to Weight: Bending, points 24
20
Thermal Diffusivity, mm2/s 3.2
4.6
Thermal Shock Resistance, points 21
19

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.010
Chromium (Cr), % 20 to 22.5
28 to 30
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 24.3 to 36.2
62.6 to 66.5
Manganese (Mn), % 1.0 to 2.0
0 to 0.3
Molybdenum (Mo), % 2.5 to 3.5
3.5 to 4.2
Nickel (Ni), % 19 to 21
2.0 to 2.5
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0 to 0.020
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.2
Sulfur (S), % 0 to 0.030
0 to 0.020
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0