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AISI 429 Stainless Steel vs. R31539 Cobalt

AISI 429 stainless steel belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. 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 AISI 429 stainless steel and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 25
13 to 22
Fatigue Strength, MPa 180
310 to 480
Poisson's Ratio 0.28
0.29
Reduction in Area, % 50
13 to 23
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 480
1000 to 1340
Tensile Strength: Yield (Proof), MPa 260
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1440
1360
Melting Onset (Solidus), °C 1400
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 26
13
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 2.0
8.2
Embodied Energy, MJ/kg 28
110
Embodied Water, L/kg 110
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 99
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 170
780 to 2000
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 17
33 to 44
Strength to Weight: Bending, points 18
27 to 32
Thermal Diffusivity, mm2/s 6.9
3.5
Thermal Shock Resistance, points 17
24 to 32

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Carbon (C), % 0 to 0.12
0 to 0.14
Chromium (Cr), % 14 to 16
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Iron (Fe), % 81.8 to 86
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0