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AISI 409 Stainless Steel vs. R30155 Cobalt

Both AISI 409 stainless steel and R30155 cobalt are iron alloys. They have 43% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is AISI 409 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 24
34
Fatigue Strength, MPa 140
310
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
81
Shear Strength, MPa 270
570
Tensile Strength: Ultimate (UTS), MPa 420
850
Tensile Strength: Yield (Proof), MPa 200
390

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Maximum Temperature: Corrosion, °C 450
570
Maximum Temperature: Mechanical, °C 710
1100
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 25
12
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
80
Density, g/cm3 7.7
8.5
Embodied Carbon, kg CO2/kg material 2.0
9.7
Embodied Energy, MJ/kg 28
150
Embodied Water, L/kg 94
300

Common Calculations

PREN (Pitting Resistance) 11
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83
230
Resilience: Unit (Modulus of Resilience), kJ/m3 100
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 15
28
Strength to Weight: Bending, points 16
24
Thermal Diffusivity, mm2/s 6.7
3.2
Thermal Shock Resistance, points 15
21

Alloy Composition

Carbon (C), % 0 to 0.080
0.080 to 0.16
Chromium (Cr), % 10.5 to 11.7
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 84.9 to 89.5
24.3 to 36.2
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 0 to 0.5
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
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
0.75 to 1.3
Titanium (Ti), % 0 to 0.75
0
Tungsten (W), % 0
2.0 to 3.0