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S82012 Stainless Steel vs. R30012 Cobalt

S82012 stainless steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is S82012 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, % 40
1.0
Fatigue Strength, MPa 480
320
Poisson's Ratio 0.28
0.28
Rockwell C Hardness 27
48
Shear Modulus, GPa 78
86
Tensile Strength: Ultimate (UTS), MPa 800
830
Tensile Strength: Yield (Proof), MPa 560
650

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1430
1470
Melting Onset (Solidus), °C 1380
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.8
Embodied Carbon, kg CO2/kg material 2.4
8.3
Embodied Energy, MJ/kg 35
120
Embodied Water, L/kg 140
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 290
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 790
960
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 29
26
Strength to Weight: Bending, points 25
22
Thermal Diffusivity, mm2/s 3.9
3.8
Thermal Shock Resistance, points 23
23

Alloy Composition

Carbon (C), % 0 to 0.050
1.4 to 2.0
Chromium (Cr), % 19 to 20.5
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Copper (Cu), % 0 to 1.0
0
Iron (Fe), % 71.3 to 77.9
0 to 3.0
Manganese (Mn), % 2.0 to 4.0
0
Molybdenum (Mo), % 0.1 to 0.6
0 to 1.0
Nickel (Ni), % 0.8 to 1.5
0 to 3.0
Nitrogen (N), % 0.16 to 0.26
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.8
0 to 2.0
Sulfur (S), % 0 to 0.0050
0
Tungsten (W), % 0
7.5 to 9.5