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R31539 Cobalt vs. AISI 431 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while AISI 431 stainless steel belongs to the iron alloys. There are 28 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 R31539 cobalt and the bottom bar is AISI 431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
15 to 17
Fatigue Strength, MPa 310 to 480
430 to 610
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 25 to 35
26
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
890 to 1380
Tensile Strength: Yield (Proof), MPa 590 to 940
710 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1360
1510
Melting Onset (Solidus), °C 1290
1450
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
26
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
3.0

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.2
2.2
Embodied Energy, MJ/kg 110
31
Embodied Water, L/kg 530
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
140 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
1270 to 2770
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
32 to 50
Strength to Weight: Bending, points 27 to 32
27 to 36
Thermal Diffusivity, mm2/s 3.5
7.0
Thermal Shock Resistance, points 24 to 32
28 to 43

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.2
Chromium (Cr), % 26 to 30
15 to 17
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
78.2 to 83.8
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
1.3 to 2.5
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030