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AISI 409 Stainless Steel vs. R30012 Cobalt

AISI 409 stainless steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is AISI 409 stainless steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 24
1.0
Fatigue Strength, MPa 140
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
86
Tensile Strength: Ultimate (UTS), MPa 420
830
Tensile Strength: Yield (Proof), MPa 200
650

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1400
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 25
15
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.8
Embodied Carbon, kg CO2/kg material 2.0
8.3
Embodied Energy, MJ/kg 28
120
Embodied Water, L/kg 94
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 100
960
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 15
26
Strength to Weight: Bending, points 16
22
Thermal Diffusivity, mm2/s 6.7
3.8
Thermal Shock Resistance, points 15
23

Alloy Composition

Carbon (C), % 0 to 0.080
1.4 to 2.0
Chromium (Cr), % 10.5 to 11.7
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Iron (Fe), % 84.9 to 89.5
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0 to 0.5
0 to 3.0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0 to 0.75
0
Tungsten (W), % 0
7.5 to 9.5