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S28200 Stainless Steel vs. R30012 Cobalt

S28200 stainless steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is S28200 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, % 45
1.0
Fatigue Strength, MPa 430
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 870
830
Tensile Strength: Yield (Proof), MPa 460
650

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1380
1470
Melting Onset (Solidus), °C 1330
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Expansion, µm/m-K 18
12

Otherwise Unclassified Properties

Density, g/cm3 7.6
8.8
Embodied Carbon, kg CO2/kg material 2.8
8.3
Embodied Energy, MJ/kg 41
120
Embodied Water, L/kg 160
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 330
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 540
960
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 26
23
Strength to Weight: Axial, points 32
26
Strength to Weight: Bending, points 27
22
Thermal Shock Resistance, points 17
23

Alloy Composition

Carbon (C), % 0 to 0.15
1.4 to 2.0
Chromium (Cr), % 17 to 19
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Copper (Cu), % 0.75 to 1.3
0
Iron (Fe), % 57.7 to 64.1
0 to 3.0
Manganese (Mn), % 17 to 19
0
Molybdenum (Mo), % 0.75 to 1.3
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Nitrogen (N), % 0.4 to 0.6
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