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Annealed AISI 304N vs. Annealed R31538 Cobalt

Annealed AISI 304N belongs to the iron alloys classification, while annealed R31538 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 (8, in this case) are not shown.

For each property being compared, the top bar is annealed AISI 304N and the bottom bar is annealed R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 34
23
Fatigue Strength, MPa 220
310
Poisson's Ratio 0.28
0.29
Reduction in Area, % 51
22
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 620
1020
Tensile Strength: Yield (Proof), MPa 270
580

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1420
1360
Melting Onset (Solidus), °C 1380
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 16
13
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 3.0
8.1
Embodied Energy, MJ/kg 43
110
Embodied Water, L/kg 150
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
200
Resilience: Unit (Modulus of Resilience), kJ/m3 180
750
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22
34
Strength to Weight: Bending, points 21
27
Thermal Diffusivity, mm2/s 4.2
3.5
Thermal Shock Resistance, points 14
25

Alloy Composition

Carbon (C), % 0 to 0.080
0.15 to 0.35
Chromium (Cr), % 18 to 20
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Iron (Fe), % 66.4 to 73.9
0 to 0.75
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 8.0 to 10.5
0 to 1.0
Nitrogen (N), % 0.1 to 0.16
0 to 0.25
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.030
0