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R30155 Cobalt vs. AWS E307

Both R30155 cobalt and AWS E307 are iron alloys. They have 63% of their average alloy composition in common. There are 23 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 E307.

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
78
Tensile Strength: Ultimate (UTS), MPa 850
660

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Melting Completion (Liquidus), °C 1470
1420
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 14
14

Otherwise Unclassified Properties

Base Metal Price, % relative 80
17
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
3.5
Embodied Energy, MJ/kg 150
49
Embodied Water, L/kg 300
160

Common Calculations

PREN (Pitting Resistance) 37
23
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
24
Strength to Weight: Bending, points 24
22
Thermal Diffusivity, mm2/s 3.2
4.1
Thermal Shock Resistance, points 21
17

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.040 to 0.14
Chromium (Cr), % 20 to 22.5
18 to 21.5
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 24.3 to 36.2
59.6 to 69.2
Manganese (Mn), % 1.0 to 2.0
3.3 to 4.8
Molybdenum (Mo), % 2.5 to 3.5
0.5 to 1.5
Nickel (Ni), % 19 to 21
9.0 to 10.7
Niobium (Nb), % 0.75 to 1.3
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 1.0
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