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R31538 Cobalt vs. AWS ER70S-B2L

R31538 cobalt belongs to the cobalt alloys classification, while AWS ER70S-B2L belongs to the iron alloys. There are 26 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 R31538 cobalt and the bottom bar is AWS ER70S-B2L.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
22
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
590
Tensile Strength: Yield (Proof), MPa 580 to 930
450

Thermal Properties

Latent Heat of Fusion, J/g 320
260
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
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.6

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.6
Embodied Energy, MJ/kg 110
21
Embodied Water, L/kg 530
54

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
120
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
530
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
21
Strength to Weight: Bending, points 27 to 32
20
Thermal Diffusivity, mm2/s 3.5
11
Thermal Shock Resistance, points 25 to 33
17

Alloy Composition


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Carbon (C), % 0.15 to 0.35
0 to 0.050
Chromium (Cr), % 26 to 30
1.2 to 1.5
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
0 to 0.35
Iron (Fe), % 0 to 0.75
95.3 to 97.6
Manganese (Mn), % 0 to 1.0
0.4 to 0.7
Molybdenum (Mo), % 5.0 to 7.0
0.4 to 0.65
Nickel (Ni), % 0 to 1.0
0 to 0.2
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 1.0
0.4 to 0.7
Sulfur (S), % 0
0 to 0.025
Residuals, % 0
0 to 0.5