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S35000 Stainless Steel vs. R30016 Cobalt

S35000 stainless steel belongs to the iron alloys classification, while R30016 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 28 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is S35000 stainless steel and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 2.3 to 14
8.4
Fatigue Strength, MPa 380 to 520
290
Poisson's Ratio 0.28
0.28
Rockwell C Hardness 26 to 37
37
Shear Modulus, GPa 78
85
Tensile Strength: Ultimate (UTS), MPa 1300 to 1570
1010
Tensile Strength: Yield (Proof), MPa 660 to 1160
580

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1410
1270
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 11
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.0

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 3.2
7.7
Embodied Energy, MJ/kg 44
110
Embodied Water, L/kg 130
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 28 to 170
72
Resilience: Unit (Modulus of Resilience), kJ/m3 1070 to 3360
770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 46 to 56
33
Strength to Weight: Bending, points 34 to 38
26
Thermal Diffusivity, mm2/s 4.4
3.9
Thermal Shock Resistance, points 42 to 51
24

Alloy Composition

Carbon (C), % 0.070 to 0.11
0.9 to 1.4
Chromium (Cr), % 16 to 17
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Iron (Fe), % 72.7 to 76.9
0 to 3.0
Manganese (Mn), % 0.5 to 1.3
0.5 to 2.0
Molybdenum (Mo), % 2.5 to 3.2
0 to 1.5
Nickel (Ni), % 4.0 to 5.0
0 to 3.0
Nitrogen (N), % 0.070 to 0.13
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.5
0.2 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
3.5 to 5.5