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AISI 305 Stainless Steel vs. R30816 Cobalt

AISI 305 stainless steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 34% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 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 AISI 305 stainless steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 220
280
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 34 to 45
23
Fatigue Strength, MPa 210 to 280
250
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 77
81
Tensile Strength: Ultimate (UTS), MPa 580 to 710
1020
Tensile Strength: Yield (Proof), MPa 230 to 350
460

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Melting Completion (Liquidus), °C 1450
1540
Melting Onset (Solidus), °C 1400
1460
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 16
13
Thermal Expansion, µm/m-K 17
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.1
Embodied Carbon, kg CO2/kg material 3.2
20
Embodied Energy, MJ/kg 45
320
Embodied Water, L/kg 150
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 210
190
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 320
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 20 to 25
31
Strength to Weight: Bending, points 20 to 23
25
Thermal Diffusivity, mm2/s 4.2
3.3
Thermal Shock Resistance, points 13 to 15
28

Alloy Composition

Carbon (C), % 0 to 0.12
0.32 to 0.42
Chromium (Cr), % 17 to 19
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 65.1 to 72.5
0 to 5.0
Manganese (Mn), % 0 to 2.0
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 10.5 to 13
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
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