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S35000 Stainless Steel vs. R30816 Cobalt

S35000 stainless steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 28% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is S35000 stainless steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 2.3 to 14
23
Fatigue Strength, MPa 380 to 520
250
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 78
81
Tensile Strength: Ultimate (UTS), MPa 1300 to 1570
1020
Tensile Strength: Yield (Proof), MPa 660 to 1160
460

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1460
1540
Melting Onset (Solidus), °C 1410
1460
Specific Heat Capacity, J/kg-K 470
420
Thermal Conductivity, W/m-K 16
13
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.1
Embodied Carbon, kg CO2/kg material 3.2
20
Embodied Energy, MJ/kg 44
320
Embodied Water, L/kg 130
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 28 to 170
190
Resilience: Unit (Modulus of Resilience), kJ/m3 1070 to 3360
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 46 to 56
31
Strength to Weight: Bending, points 34 to 38
25
Thermal Diffusivity, mm2/s 4.4
3.3
Thermal Shock Resistance, points 42 to 51
28

Alloy Composition

Carbon (C), % 0.070 to 0.11
0.32 to 0.42
Chromium (Cr), % 16 to 17
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 72.7 to 76.9
0 to 5.0
Manganese (Mn), % 0.5 to 1.3
1.0 to 2.0
Molybdenum (Mo), % 2.5 to 3.2
3.5 to 4.5
Nickel (Ni), % 4.0 to 5.0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Nitrogen (N), % 0.070 to 0.13
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5