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AISI 304L Stainless Steel vs. Solder Alloy 721

AISI 304L stainless steel belongs to the iron alloys classification, while solder alloy 721 belongs to the otherwise unclassified metals. 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 AISI 304L stainless steel and the bottom bar is solder alloy 721.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
51
Elongation at Break, % 6.7 to 46
17
Poisson's Ratio 0.28
0.36
Shear Modulus, GPa 77
19
Tensile Strength: Ultimate (UTS), MPa 540 to 1160
50

Thermal Properties

Latent Heat of Fusion, J/g 290
61
Melting Completion (Liquidus), °C 1450
220
Melting Onset (Solidus), °C 1400
210
Specific Heat Capacity, J/kg-K 480
220
Thermal Conductivity, W/m-K 16
56
Thermal Expansion, µm/m-K 17
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
14
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
17

Otherwise Unclassified Properties

Density, g/cm3 7.8
7.4
Embodied Carbon, kg CO2/kg material 3.1
17
Embodied Energy, MJ/kg 44
280

Common Calculations

Stiffness to Weight: Axial, points 14
3.8
Stiffness to Weight: Bending, points 25
17
Strength to Weight: Axial, points 19 to 41
1.9
Strength to Weight: Bending, points 19 to 31
4.1
Thermal Diffusivity, mm2/s 4.2
34
Thermal Shock Resistance, points 12 to 25
3.2

Alloy Composition

Aluminum (Al), % 0
0 to 0.0010
Antimony (Sb), % 0
0 to 0.1
Arsenic (As), % 0
0 to 0.030
Bismuth (Bi), % 0
0.8 to 1.2
Cadmium (Cd), % 0
0 to 0.0020
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 18 to 20
0
Copper (Cu), % 0
0.3 to 0.7
Gold (Au), % 0
0 to 0.050
Indium (In), % 0
0 to 0.1
Iron (Fe), % 65 to 74
0 to 0.020
Lead (Pb), % 0
0 to 0.070
Manganese (Mn), % 0 to 2.0
0
Nickel (Ni), % 8.0 to 12
0 to 0.010
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0
Silver (Ag), % 0
2.3 to 2.7
Sulfur (S), % 0 to 0.030
0
Tin (Sn), % 0
95 to 96.6
Zinc (Zn), % 0
0 to 0.0010