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AWS E312 vs. R30155 Cobalt

Both AWS E312 and R30155 cobalt are iron alloys. They have 63% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is AWS E312 and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 25
34
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
81
Tensile Strength: Ultimate (UTS), MPa 740
850

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Melting Completion (Liquidus), °C 1410
1470
Melting Onset (Solidus), °C 1360
1420
Specific Heat Capacity, J/kg-K 480
450
Thermal Expansion, µm/m-K 15
14

Otherwise Unclassified Properties

Base Metal Price, % relative 20
80
Density, g/cm3 7.7
8.5
Embodied Carbon, kg CO2/kg material 3.6
9.7
Embodied Energy, MJ/kg 52
150
Embodied Water, L/kg 200
300

Common Calculations

PREN (Pitting Resistance) 31
37
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 27
28
Strength to Weight: Bending, points 24
24
Thermal Shock Resistance, points 18
21

Alloy Composition

Carbon (C), % 0 to 0.15
0.080 to 0.16
Chromium (Cr), % 28 to 32
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 52.3 to 63.5
24.3 to 36.2
Manganese (Mn), % 0.5 to 2.5
1.0 to 2.0
Molybdenum (Mo), % 0 to 0.75
2.5 to 3.5
Nickel (Ni), % 8.0 to 10.5
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0