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AISI 409 Stainless Steel vs. G-CoCr28 Cobalt

AISI 409 stainless steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is AISI 409 stainless steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 24
6.7
Fatigue Strength, MPa 140
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
83
Tensile Strength: Ultimate (UTS), MPa 420
560
Tensile Strength: Yield (Proof), MPa 200
260

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Maximum Temperature: Mechanical, °C 710
1200
Melting Completion (Liquidus), °C 1450
1330
Melting Onset (Solidus), °C 1400
1270
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 25
8.5
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
100
Density, g/cm3 7.7
8.1
Embodied Carbon, kg CO2/kg material 2.0
6.2
Embodied Energy, MJ/kg 28
84
Embodied Water, L/kg 94
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83
31
Resilience: Unit (Modulus of Resilience), kJ/m3 100
160
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 15
19
Strength to Weight: Bending, points 16
19
Thermal Diffusivity, mm2/s 6.7
2.2
Thermal Shock Resistance, points 15
14

Alloy Composition

Carbon (C), % 0 to 0.080
0.050 to 0.25
Chromium (Cr), % 10.5 to 11.7
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 84.9 to 89.5
9.7 to 24.5
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0 to 0.5
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0.5 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0 to 0.75
0