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R31539 Cobalt vs. AISI 303 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while AISI 303 stainless steel belongs to the iron alloys. There are 27 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 R31539 cobalt and the bottom bar is AISI 303 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
40 to 51
Fatigue Strength, MPa 310 to 480
230 to 360
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
600 to 690
Tensile Strength: Yield (Proof), MPa 590 to 940
230 to 420

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1290
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.8

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.2
3.0
Embodied Energy, MJ/kg 110
42
Embodied Water, L/kg 530
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
240
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
140 to 440
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
21 to 25
Strength to Weight: Bending, points 27 to 32
20 to 22
Thermal Diffusivity, mm2/s 3.5
4.4
Thermal Shock Resistance, points 24 to 32
13 to 15

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.15
Chromium (Cr), % 26 to 30
17 to 19
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
67.3 to 74.9
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
8.0 to 10
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.2
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0.15 to 0.35

Comparable Variants