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AWS E308Mo vs. R30003 Cobalt

AWS E308Mo belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. They have 50% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is AWS E308Mo and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 40
10 to 73
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
83
Tensile Strength: Ultimate (UTS), MPa 620
970 to 1720

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Melting Completion (Liquidus), °C 1440
1400
Melting Onset (Solidus), °C 1400
1440
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 16
13
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.1

Otherwise Unclassified Properties

Base Metal Price, % relative 19
95
Density, g/cm3 7.9
8.4
Embodied Carbon, kg CO2/kg material 3.8
8.0
Embodied Energy, MJ/kg 53
110
Embodied Water, L/kg 160
400

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22
32 to 57
Strength to Weight: Bending, points 20
26 to 38
Thermal Diffusivity, mm2/s 4.2
3.3
Thermal Shock Resistance, points 16
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 0 to 0.080
0 to 0.15
Chromium (Cr), % 18 to 21
19 to 21
Cobalt (Co), % 0
39 to 41
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 59.6 to 70.5
10 to 20.5
Manganese (Mn), % 0.5 to 2.5
1.5 to 2.5
Molybdenum (Mo), % 2.0 to 3.0
6.0 to 8.0
Nickel (Ni), % 9.0 to 12
14 to 16
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.015