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AWS E312 vs. R30035 Cobalt

AWS E312 belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. They have a modest 30% 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 (10, in this case) are not shown.

For each property being compared, the top bar is AWS E312 and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220 to 230
Elongation at Break, % 25
9.0 to 46
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
84 to 89
Tensile Strength: Ultimate (UTS), MPa 740
900 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1410
1440
Melting Onset (Solidus), °C 1360
1320
Specific Heat Capacity, J/kg-K 480
440
Thermal Expansion, µm/m-K 15
13

Otherwise Unclassified Properties

Base Metal Price, % relative 20
100
Density, g/cm3 7.7
8.7
Embodied Carbon, kg CO2/kg material 3.6
10
Embodied Energy, MJ/kg 52
140
Embodied Water, L/kg 200
410

Common Calculations

Stiffness to Weight: Axial, points 15
14 to 15
Stiffness to Weight: Bending, points 25
23 to 24
Strength to Weight: Axial, points 27
29 to 61
Strength to Weight: Bending, points 24
24 to 39
Thermal Shock Resistance, points 18
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.15
0 to 0.025
Chromium (Cr), % 28 to 32
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 52.3 to 63.5
0 to 1.0
Manganese (Mn), % 0.5 to 2.5
0 to 0.15
Molybdenum (Mo), % 0 to 0.75
9.0 to 10.5
Nickel (Ni), % 8.0 to 10.5
33 to 37
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 0.15
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 1.0