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AISI 409 Stainless Steel vs. R30816 Cobalt

AISI 409 stainless steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 25 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 409 stainless steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 24
23
Fatigue Strength, MPa 140
250
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 75
81
Tensile Strength: Ultimate (UTS), MPa 420
1020
Tensile Strength: Yield (Proof), MPa 200
460

Thermal Properties

Latent Heat of Fusion, J/g 270
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 25
13
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 7.7
9.1
Embodied Carbon, kg CO2/kg material 2.0
20
Embodied Energy, MJ/kg 28
320
Embodied Water, L/kg 94
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83
190
Resilience: Unit (Modulus of Resilience), kJ/m3 100
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 15
31
Strength to Weight: Bending, points 16
25
Thermal Diffusivity, mm2/s 6.7
3.3
Thermal Shock Resistance, points 15
28

Alloy Composition

Carbon (C), % 0 to 0.080
0.32 to 0.42
Chromium (Cr), % 10.5 to 11.7
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 84.9 to 89.5
0 to 5.0
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0 to 0.5
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 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Titanium (Ti), % 0 to 0.75
0
Tungsten (W), % 0
3.5 to 4.5