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R31538 Cobalt vs. ASTM Grade LCB Steel

R31538 cobalt belongs to the cobalt alloys classification, while ASTM grade LCB steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is ASTM grade LCB steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
27
Fatigue Strength, MPa 310 to 480
200
Poisson's Ratio 0.29
0.29
Reduction in Area, % 13 to 22
40
Shear Modulus, GPa 86
72
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
540
Tensile Strength: Yield (Proof), MPa 580 to 930
270

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1290
1410
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
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.2

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.4
Embodied Energy, MJ/kg 110
18
Embodied Water, L/kg 530
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
120
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
200
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
19
Strength to Weight: Bending, points 27 to 32
19
Thermal Diffusivity, mm2/s 3.5
14
Thermal Shock Resistance, points 25 to 33
17

Alloy Composition


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Carbon (C), % 0.15 to 0.35
0 to 0.3
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Iron (Fe), % 0 to 0.75
97 to 100
Manganese (Mn), % 0 to 1.0
0 to 1.0
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 to 0.6
Sulfur (S), % 0
0 to 0.045
Residuals, % 0
0 to 1.0