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R31539 Cobalt vs. SAE-AISI 1038 Steel

R31539 cobalt belongs to the cobalt alloys classification, while SAE-AISI 1038 steel belongs to the iron alloys. There are 28 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 R31539 cobalt and the bottom bar is SAE-AISI 1038 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 22
14 to 20
Fatigue Strength, MPa 310 to 480
220 to 350
Poisson's Ratio 0.29
0.29
Reduction in Area, % 13 to 23
40 to 45
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
590 to 640
Tensile Strength: Yield (Proof), MPa 590 to 940
320 to 540

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
51
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.0

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.2
1.4
Embodied Energy, MJ/kg 110
18
Embodied Water, L/kg 530
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
83 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
270 to 790
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33 to 44
21 to 23
Strength to Weight: Bending, points 27 to 32
20 to 21
Thermal Diffusivity, mm2/s 3.5
14
Thermal Shock Resistance, points 24 to 32
19 to 20

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.35 to 0.42
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
98.6 to 99.05
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0.6 to 0.9
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0
0 to 0.050

Comparable Variants