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Solder Alloy 721 vs. S21904 Stainless Steel

Solder alloy 721 belongs to the otherwise unclassified metals classification, while S21904 stainless steel belongs to the iron alloys. There are 22 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 solder alloy 721 and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
200
Elongation at Break, % 17
17 to 51
Poisson's Ratio 0.36
0.28
Shear Modulus, GPa 19
78
Tensile Strength: Ultimate (UTS), MPa 50
700 to 1000

Thermal Properties

Latent Heat of Fusion, J/g 61
290
Melting Completion (Liquidus), °C 220
1400
Melting Onset (Solidus), °C 210
1350
Specific Heat Capacity, J/kg-K 220
480
Thermal Conductivity, W/m-K 56
14
Thermal Expansion, µm/m-K 22
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 17
2.9

Otherwise Unclassified Properties

Density, g/cm3 7.4
7.7
Embodied Carbon, kg CO2/kg material 17
3.0
Embodied Energy, MJ/kg 280
43

Common Calculations

Stiffness to Weight: Axial, points 3.8
14
Stiffness to Weight: Bending, points 17
25
Strength to Weight: Axial, points 1.9
25 to 36
Strength to Weight: Bending, points 4.1
23 to 29
Thermal Diffusivity, mm2/s 34
3.8
Thermal Shock Resistance, points 3.2
15 to 21

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 0.040
Chromium (Cr), % 0
19 to 21.5
Copper (Cu), % 0.3 to 0.7
0
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
59.5 to 67.4
Lead (Pb), % 0 to 0.070
0
Manganese (Mn), % 0
8.0 to 10
Nickel (Ni), % 0 to 0.010
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0
0 to 0.045
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