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AWS E312 vs. R31233 Cobalt

AWS E312 belongs to the iron alloys classification, while R31233 cobalt belongs to the cobalt alloys. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 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 R31233 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 25
17
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
85
Tensile Strength: Ultimate (UTS), MPa 740
1020

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1410
1350
Melting Onset (Solidus), °C 1360
1330
Specific Heat Capacity, J/kg-K 480
440
Thermal Expansion, µm/m-K 15
13

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.6
Embodied Carbon, kg CO2/kg material 3.6
8.4
Embodied Energy, MJ/kg 52
110
Embodied Water, L/kg 200
480

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 27
33
Strength to Weight: Bending, points 24
26
Thermal Shock Resistance, points 18
25

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.15
0.020 to 0.1
Chromium (Cr), % 28 to 32
23.5 to 27.5
Cobalt (Co), % 0
44.7 to 63.3
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 52.3 to 63.5
1.0 to 5.0
Manganese (Mn), % 0.5 to 2.5
0.1 to 1.5
Molybdenum (Mo), % 0 to 0.75
4.0 to 6.0
Nickel (Ni), % 8.0 to 10.5
7.0 to 11
Nitrogen (N), % 0
0.030 to 0.12
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0.050 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.020
Tungsten (W), % 0
1.0 to 3.0