AWS BNi-5 vs. R30021 Cobalt

AWS BNi-5 belongs to the nickel alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 22% of their average alloy composition in common, which, by itself, doesn't mean much. There are 18 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is AWS BNi-5 and the bottom bar is R30021 cobalt.

AWS BNi-5 (N99650) Filler Metal UNS R30021 Co-Cr-W Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		190
Elastic (Young's, Tensile) Modulus, GPa		220

Poisson's Ratio		0.29
Poisson's Ratio		0.29

Shear Modulus, GPa		72
Shear Modulus, GPa		86

Tensile Strength: Ultimate (UTS), MPa		470
Tensile Strength: Ultimate (UTS), MPa		700

Thermal Properties

Latent Heat of Fusion, J/g		470
Latent Heat of Fusion, J/g		330

Melting Completion (Liquidus), °C		1140
Melting Completion (Liquidus), °C		1350

Melting Onset (Solidus), °C		1080
Melting Onset (Solidus), °C		1190

Specific Heat Capacity, J/kg-K		510
Specific Heat Capacity, J/kg-K		450

Thermal Expansion, µm/m-K		12
Thermal Expansion, µm/m-K		11

Otherwise Unclassified Properties

Density, g/cm³		7.7
Density, g/cm³		8.4

Embodied Carbon, kg CO₂/kg material		8.9
Embodied Carbon, kg CO₂/kg material		8.0

Embodied Energy, MJ/kg		130
Embodied Energy, MJ/kg		110

Embodied Water, L/kg		260
Embodied Water, L/kg		520

Common Calculations

Stiffness to Weight: Axial, points		13
Stiffness to Weight: Axial, points		15

Stiffness to Weight: Bending, points		25
Stiffness to Weight: Bending, points		24

Strength to Weight: Axial, points		17
Strength to Weight: Axial, points		23

Strength to Weight: Bending, points		17
Strength to Weight: Bending, points		21

Thermal Shock Resistance, points		15
Thermal Shock Resistance, points		21

Alloy Composition

Aluminum (Al), %		0 to 0.050
Aluminum (Al), %		0

Boron (B), %		0 to 0.030
Boron (B), %		0

Carbon (C), %		0 to 0.060
Carbon (C), %		0.2 to 0.35

Chromium (Cr), %		18.5 to 19.5
Chromium (Cr), %		26 to 29

Cobalt (Co), %		0 to 0.1
Cobalt (Co), %		61.7 to 67.3

Iron (Fe), %		0
Iron (Fe), %		0 to 3.0

Molybdenum (Mo), %		0
Molybdenum (Mo), %		4.5 to 6.0

Nickel (Ni), %		69.1 to 71.8
Nickel (Ni), %		2.0 to 3.0

Phosphorus (P), %		0 to 0.020
Phosphorus (P), %		0

Selenium (Se), %		0 to 0.0050
Selenium (Se), %		0

Silicon (Si), %		9.8 to 10.5
Silicon (Si), %		0 to 1.5

Sulfur (S), %		0 to 0.020
Sulfur (S), %		0

Titanium (Ti), %		0 to 0.050
Titanium (Ti), %		0

Zirconium (Zr), %		0 to 0.050
Zirconium (Zr), %		0

Residuals, %		0 to 0.5
Residuals, %		0