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AISI 205 Stainless Steel vs. R30001 Cobalt

AISI 205 stainless steel belongs to the iron alloys classification, while R30001 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 19 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

For each property being compared, the top bar is AISI 205 stainless steel and the bottom bar is R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 11 to 51
1.0
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 800 to 1430
620

Thermal Properties

Latent Heat of Fusion, J/g 280
310
Melting Completion (Liquidus), °C 1380
1530
Melting Onset (Solidus), °C 1340
1260
Specific Heat Capacity, J/kg-K 480
430
Thermal Expansion, µm/m-K 18
11

Otherwise Unclassified Properties

Density, g/cm3 7.6
9.0
Embodied Carbon, kg CO2/kg material 2.6
8.9
Embodied Energy, MJ/kg 37
130
Embodied Water, L/kg 150
460

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
22
Strength to Weight: Axial, points 29 to 52
19
Strength to Weight: Bending, points 25 to 37
18
Thermal Shock Resistance, points 16 to 29
19

Alloy Composition

Carbon (C), % 0.12 to 0.25
2.0 to 3.0
Chromium (Cr), % 16.5 to 18.5
28 to 32
Cobalt (Co), % 0
43 to 59
Iron (Fe), % 62.6 to 68.1
0 to 3.0
Manganese (Mn), % 14 to 15.5
0
Molybdenum (Mo), % 0
0 to 1.0
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 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
11 to 13