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AWS E308H vs. R30816 Cobalt

AWS E308H belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 34% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is AWS E308H and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 40
23
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 77
81
Tensile Strength: Ultimate (UTS), MPa 620
1020

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Melting Completion (Liquidus), °C 1420
1540
Melting Onset (Solidus), °C 1380
1460
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 16
13
Thermal Expansion, µm/m-K 14
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.1
Embodied Carbon, kg CO2/kg material 3.2
20
Embodied Energy, MJ/kg 46
320
Embodied Water, L/kg 150
440

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 22
31
Strength to Weight: Bending, points 21
25
Thermal Diffusivity, mm2/s 4.2
3.3
Thermal Shock Resistance, points 16
28

Alloy Composition

Carbon (C), % 0.040 to 0.080
0.32 to 0.42
Chromium (Cr), % 18 to 21
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 62.9 to 72.5
0 to 5.0
Manganese (Mn), % 0.5 to 2.5
1.0 to 2.0
Molybdenum (Mo), % 0 to 0.75
3.5 to 4.5
Nickel (Ni), % 9.0 to 11
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5