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AWS E630 vs. R30008 Cobalt

AWS E630 belongs to the iron alloys classification, while R30008 cobalt belongs to the cobalt alloys. They have a modest 36% of their average alloy composition in common, which, by itself, doesn't mean much. There are 20 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is AWS E630 and the bottom bar is R30008 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 8.0
1.1 to 73
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
83
Tensile Strength: Ultimate (UTS), MPa 1040
950 to 1700

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1430
1400
Melting Onset (Solidus), °C 1380
1330
Specific Heat Capacity, J/kg-K 470
450
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Base Metal Price, % relative 14
95
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 2.8
8.1
Embodied Energy, MJ/kg 40
110
Embodied Water, L/kg 140
400

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 37
31 to 56
Strength to Weight: Bending, points 29
25 to 37
Thermal Shock Resistance, points 28
25 to 44

Alloy Composition

Boron (B), % 0
0 to 0.0010
Carbon (C), % 0 to 0.050
0 to 0.15
Chromium (Cr), % 16 to 16.8
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Copper (Cu), % 3.3 to 4.0
0
Iron (Fe), % 71.6 to 75.9
7.6 to 20
Manganese (Mn), % 0.25 to 0.75
1.0 to 2.0
Molybdenum (Mo), % 0 to 0.75
6.5 to 7.5
Nickel (Ni), % 4.5 to 5.0
15 to 18
Niobium (Nb), % 0.15 to 0.3
0
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 0.75
0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.015