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Solder Alloy 721 vs. AWS ERNiFeCr-2

Solder alloy 721 belongs to the otherwise unclassified metals classification, while AWS ERNiFeCr-2 belongs to the nickel alloys. There are 22 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is solder alloy 721 and the bottom bar is AWS ERNiFeCr-2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
190
Elongation at Break, % 17
28
Poisson's Ratio 0.36
0.29
Shear Modulus, GPa 19
75
Tensile Strength: Ultimate (UTS), MPa 50
1300

Thermal Properties

Latent Heat of Fusion, J/g 61
310
Melting Completion (Liquidus), °C 220
1460
Melting Onset (Solidus), °C 210
1410
Specific Heat Capacity, J/kg-K 220
450
Thermal Conductivity, W/m-K 56
12
Thermal Expansion, µm/m-K 22
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 17
1.5

Otherwise Unclassified Properties

Density, g/cm3 7.4
8.3
Embodied Carbon, kg CO2/kg material 17
13
Embodied Energy, MJ/kg 280
190

Common Calculations

Stiffness to Weight: Axial, points 3.8
13
Stiffness to Weight: Bending, points 17
23
Strength to Weight: Axial, points 1.9
43
Strength to Weight: Bending, points 4.1
32
Thermal Diffusivity, mm2/s 34
3.2
Thermal Shock Resistance, points 3.2
38

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0.2 to 0.8
Antimony (Sb), % 0 to 0.1
0
Arsenic (As), % 0 to 0.030
0
Bismuth (Bi), % 0.8 to 1.2
0
Boron (B), % 0
0 to 0.0030
Cadmium (Cd), % 0 to 0.0020
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0
17 to 21
Copper (Cu), % 0.3 to 0.7
0 to 0.3
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
11.6 to 24.6
Lead (Pb), % 0 to 0.070
0
Manganese (Mn), % 0
0 to 0.35
Molybdenum (Mo), % 0
2.8 to 3.3
Nickel (Ni), % 0 to 0.010
50 to 55
Niobium (Nb), % 0
4.8 to 5.5
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0
0 to 0.35
Silver (Ag), % 2.3 to 2.7
0
Sulfur (S), % 0
0 to 0.015
Tin (Sn), % 95 to 96.6
0
Titanium (Ti), % 0
0.65 to 1.2
Zinc (Zn), % 0 to 0.0010
0
Residuals, % 0
0 to 0.5