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AISI 205 Stainless Steel vs. R30016 Cobalt

AISI 205 stainless steel belongs to the iron alloys classification, while R30016 cobalt belongs to the cobalt alloys. They have a modest 22% 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 (15, in this case) are not shown.

For each property being compared, the top bar is AISI 205 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, % 11 to 51
8.4
Fatigue Strength, MPa 410 to 640
290
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
85
Tensile Strength: Ultimate (UTS), MPa 800 to 1430
1010
Tensile Strength: Yield (Proof), MPa 450 to 1100
580

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1380
1360
Melting Onset (Solidus), °C 1340
1270
Specific Heat Capacity, J/kg-K 480
450
Thermal Expansion, µm/m-K 18
14

Otherwise Unclassified Properties

Density, g/cm3 7.6
8.5
Embodied Carbon, kg CO2/kg material 2.6
7.7
Embodied Energy, MJ/kg 37
110
Embodied Water, L/kg 150
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150 to 430
72
Resilience: Unit (Modulus of Resilience), kJ/m3 510 to 3060
770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 29 to 52
33
Strength to Weight: Bending, points 25 to 37
26
Thermal Shock Resistance, points 16 to 29
24

Alloy Composition

Carbon (C), % 0.12 to 0.25
0.9 to 1.4
Chromium (Cr), % 16.5 to 18.5
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Iron (Fe), % 62.6 to 68.1
0 to 3.0
Manganese (Mn), % 14 to 15.5
0.5 to 2.0
Molybdenum (Mo), % 0
0 to 1.5
Nickel (Ni), % 1.0 to 1.7
0 to 3.0
Nitrogen (N), % 0.32 to 0.4
0
Phosphorus (P), % 0 to 0.060
0
Silicon (Si), % 0 to 1.0
0.2 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
3.5 to 5.5