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S21904 Stainless Steel vs. R30012 Cobalt

S21904 stainless steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is S21904 stainless steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 17 to 51
1.0
Fatigue Strength, MPa 380 to 550
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
86
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
830
Tensile Strength: Yield (Proof), MPa 390 to 910
650

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1400
1470
Melting Onset (Solidus), °C 1350
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 17
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.8
Embodied Carbon, kg CO2/kg material 3.0
8.3
Embodied Energy, MJ/kg 43
120
Embodied Water, L/kg 160
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
960
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 25 to 36
26
Strength to Weight: Bending, points 23 to 29
22
Thermal Diffusivity, mm2/s 3.8
3.8
Thermal Shock Resistance, points 15 to 21
23

Alloy Composition

Carbon (C), % 0 to 0.040
1.4 to 2.0
Chromium (Cr), % 19 to 21.5
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Iron (Fe), % 59.5 to 67.4
0 to 3.0
Manganese (Mn), % 8.0 to 10
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 5.5 to 7.5
0 to 3.0
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
7.5 to 9.5