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R30155 Cobalt vs. AWS E320

Both R30155 cobalt and AWS E320 are iron alloys. They have 75% 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 R30155 cobalt and the bottom bar is AWS E320.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
34
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
77
Tensile Strength: Ultimate (UTS), MPa 850
620

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Melting Completion (Liquidus), °C 1470
1410
Melting Onset (Solidus), °C 1420
1360
Specific Heat Capacity, J/kg-K 450
460
Thermal Expansion, µm/m-K 14
14

Otherwise Unclassified Properties

Base Metal Price, % relative 80
38
Density, g/cm3 8.5
8.2
Embodied Carbon, kg CO2/kg material 9.7
6.5
Embodied Energy, MJ/kg 150
91
Embodied Water, L/kg 300
220

Common Calculations

PREN (Pitting Resistance) 37
28
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
21
Strength to Weight: Bending, points 24
20
Thermal Shock Resistance, points 21
16

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.070
Chromium (Cr), % 20 to 22.5
19 to 21
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
3.0 to 4.0
Iron (Fe), % 24.3 to 36.2
31.8 to 43.5
Manganese (Mn), % 1.0 to 2.0
0.5 to 2.5
Molybdenum (Mo), % 2.5 to 3.5
2.0 to 3.0
Nickel (Ni), % 19 to 21
32 to 36
Niobium (Nb), % 0.75 to 1.3
0 to 1.0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0