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AWS ERNiCrMo-4 vs. R30021 Cobalt

AWS ERNiCrMo-4 belongs to the nickel alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 26% 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 (11, in this case) are not shown.

For each property being compared, the top bar is AWS ERNiCrMo-4 and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
220
Elongation at Break, % 28
9.0
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 84
86
Tensile Strength: Ultimate (UTS), MPa 790
700

Thermal Properties

Latent Heat of Fusion, J/g 310
330
Melting Completion (Liquidus), °C 1590
1350
Melting Onset (Solidus), °C 1530
1190
Specific Heat Capacity, J/kg-K 410
450
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 9.0
8.4
Embodied Carbon, kg CO2/kg material 13
8.0
Embodied Energy, MJ/kg 170
110
Embodied Water, L/kg 280
520

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 24
23
Strength to Weight: Bending, points 21
21
Thermal Shock Resistance, points 22
21

Alloy Composition

Carbon (C), % 0 to 0.020
0.2 to 0.35
Chromium (Cr), % 14.5 to 16.5
26 to 29
Cobalt (Co), % 0 to 2.5
61.7 to 67.3
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 4.0 to 7.0
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 15 to 17
4.5 to 6.0
Nickel (Ni), % 50 to 63.5
2.0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.080
0 to 1.5
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 3.0 to 4.5
0
Vanadium (V), % 0 to 0.35
0
Residuals, % 0 to 0.5
0