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Solder Alloy 721 vs. S45000 Stainless Steel

Solder alloy 721 belongs to the otherwise unclassified metals classification, while S45000 stainless steel belongs to the iron alloys. There are 22 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 solder alloy 721 and the bottom bar is S45000 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
200
Elongation at Break, % 17
6.8 to 14
Poisson's Ratio 0.36
0.28
Shear Modulus, GPa 19
76
Tensile Strength: Ultimate (UTS), MPa 50
980 to 1410

Thermal Properties

Latent Heat of Fusion, J/g 61
280
Melting Completion (Liquidus), °C 220
1440
Melting Onset (Solidus), °C 210
1390
Specific Heat Capacity, J/kg-K 220
480
Thermal Conductivity, W/m-K 56
17
Thermal Expansion, µm/m-K 22
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 17
2.5

Otherwise Unclassified Properties

Density, g/cm3 7.4
7.8
Embodied Carbon, kg CO2/kg material 17
2.8
Embodied Energy, MJ/kg 280
39

Common Calculations

Stiffness to Weight: Axial, points 3.8
14
Stiffness to Weight: Bending, points 17
25
Strength to Weight: Axial, points 1.9
35 to 50
Strength to Weight: Bending, points 4.1
28 to 36
Thermal Diffusivity, mm2/s 34
4.5
Thermal Shock Resistance, points 3.2
33 to 47

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0
Antimony (Sb), % 0 to 0.1
0
Arsenic (As), % 0 to 0.030
0
Bismuth (Bi), % 0.8 to 1.2
0
Cadmium (Cd), % 0 to 0.0020
0
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0
14 to 16
Copper (Cu), % 0.3 to 0.7
1.3 to 1.8
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
72.1 to 79.3
Lead (Pb), % 0 to 0.070
0
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
0.5 to 1.0
Nickel (Ni), % 0 to 0.010
5.0 to 7.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Silver (Ag), % 2.3 to 2.7
0
Sulfur (S), % 0
0 to 0.030
Tin (Sn), % 95 to 96.6
0
Zinc (Zn), % 0 to 0.0010
0