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R30155 Cobalt vs. S21603 Stainless Steel

Both R30155 cobalt and S21603 stainless steel are iron alloys. They have 61% 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 S21603 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
200
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
45
Fatigue Strength, MPa 310
360
Poisson's Ratio 0.29
0.28
Reduction in Area, % 34
57
Shear Modulus, GPa 81
79
Shear Strength, MPa 570
490
Tensile Strength: Ultimate (UTS), MPa 850
690
Tensile Strength: Yield (Proof), MPa 390
390

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 570
420
Maximum Temperature: Mechanical, °C 1100
990
Melting Completion (Liquidus), °C 1470
1420
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 14
17

Otherwise Unclassified Properties

Base Metal Price, % relative 80
17
Density, g/cm3 8.5
7.7
Embodied Carbon, kg CO2/kg material 9.7
3.6
Embodied Energy, MJ/kg 150
50
Embodied Water, L/kg 300
160

Common Calculations

PREN (Pitting Resistance) 37
34
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
270
Resilience: Unit (Modulus of Resilience), kJ/m3 370
380
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
25
Strength to Weight: Bending, points 24
22
Thermal Shock Resistance, points 21
15

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.030
Chromium (Cr), % 20 to 22.5
17.5 to 22
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
57.6 to 67.8
Manganese (Mn), % 1.0 to 2.0
7.5 to 9.0
Molybdenum (Mo), % 2.5 to 3.5
2.0 to 3.0
Nickel (Ni), % 19 to 21
5.0 to 7.0
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0.25 to 0.5
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 0.75
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