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R30155 Cobalt vs. S21800 Stainless Steel

Both R30155 cobalt and S21800 stainless steel are iron alloys. They have 58% of their average alloy composition in common. There are 30 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 S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
210
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
40
Fatigue Strength, MPa 310
330
Poisson's Ratio 0.29
0.28
Reduction in Area, % 34
62
Shear Modulus, GPa 81
75
Shear Strength, MPa 570
510
Tensile Strength: Ultimate (UTS), MPa 850
740
Tensile Strength: Yield (Proof), MPa 390
390

Thermal Properties

Latent Heat of Fusion, J/g 300
340
Maximum Temperature: Corrosion, °C 570
410
Maximum Temperature: Mechanical, °C 1100
900
Melting Completion (Liquidus), °C 1470
1360
Melting Onset (Solidus), °C 1420
1310
Specific Heat Capacity, J/kg-K 450
500
Thermal Expansion, µm/m-K 14
16

Otherwise Unclassified Properties

Base Metal Price, % relative 80
15
Density, g/cm3 8.5
7.5
Embodied Carbon, kg CO2/kg material 9.7
3.1
Embodied Energy, MJ/kg 150
45
Embodied Water, L/kg 300
150

Common Calculations

PREN (Pitting Resistance) 37
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
250
Resilience: Unit (Modulus of Resilience), kJ/m3 370
390
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
26
Strength to Weight: Axial, points 28
27
Strength to Weight: Bending, points 24
24
Thermal Shock Resistance, points 21
17

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.1
Chromium (Cr), % 20 to 22.5
16 to 18
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
59.1 to 65.4
Manganese (Mn), % 1.0 to 2.0
7.0 to 9.0
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
8.0 to 9.0
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0.080 to 0.18
Phosphorus (P), % 0 to 0.040
0 to 0.060
Silicon (Si), % 0 to 1.0
3.5 to 4.5
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