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AWS E312 vs. R30012 Cobalt

AWS E312 belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. They have a modest 33% 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 (12, in this case) are not shown.

For each property being compared, the top bar is AWS E312 and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 25
1.0
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 80
86
Tensile Strength: Ultimate (UTS), MPa 740
830

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1410
1470
Melting Onset (Solidus), °C 1360
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Expansion, µm/m-K 15
12

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.8
Embodied Carbon, kg CO2/kg material 3.6
8.3
Embodied Energy, MJ/kg 52
120
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
26
Strength to Weight: Bending, points 24
22
Thermal Shock Resistance, points 18
23

Alloy Composition

Carbon (C), % 0 to 0.15
1.4 to 2.0
Chromium (Cr), % 28 to 32
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 52.3 to 63.5
0 to 3.0
Manganese (Mn), % 0.5 to 2.5
0
Molybdenum (Mo), % 0 to 0.75
0 to 1.0
Nickel (Ni), % 8.0 to 10.5
0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
7.5 to 9.5