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AWS E312 vs. R30008 Cobalt

AWS E312 belongs to the iron alloys classification, while R30008 cobalt belongs to the cobalt alloys. They have 46% of their average alloy composition in common. There are 20 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 E312 and the bottom bar is R30008 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 25
1.1 to 73
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
83
Tensile Strength: Ultimate (UTS), MPa 740
950 to 1700

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1410
1400
Melting Onset (Solidus), °C 1360
1330
Specific Heat Capacity, J/kg-K 480
450
Thermal Expansion, µm/m-K 15
13

Otherwise Unclassified Properties

Base Metal Price, % relative 20
95
Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 3.6
8.1
Embodied Energy, MJ/kg 52
110
Embodied Water, L/kg 200
400

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 27
31 to 56
Strength to Weight: Bending, points 24
25 to 37
Thermal Shock Resistance, points 18
25 to 44

Alloy Composition

Boron (B), % 0
0 to 0.0010
Carbon (C), % 0 to 0.15
0 to 0.15
Chromium (Cr), % 28 to 32
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 52.3 to 63.5
7.6 to 20
Manganese (Mn), % 0.5 to 2.5
1.0 to 2.0
Molybdenum (Mo), % 0 to 0.75
6.5 to 7.5
Nickel (Ni), % 8.0 to 10.5
15 to 18
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