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Solder Alloy 137 vs. ASTM A369 Grade FP21

Solder alloy 137 belongs to the otherwise unclassified metals classification, while ASTM A369 grade FP21 belongs to the iron alloys. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is solder alloy 137 and the bottom bar is ASTM A369 grade FP21.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 24
190
Elongation at Break, % 19
20
Poisson's Ratio 0.42
0.29
Shear Modulus, GPa 8.3
74
Tensile Strength: Ultimate (UTS), MPa 34
470

Thermal Properties

Latent Heat of Fusion, J/g 33
260
Melting Completion (Liquidus), °C 270
1470
Melting Onset (Solidus), °C 190
1430
Specific Heat Capacity, J/kg-K 150
470
Thermal Conductivity, W/m-K 38
41
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 7.7
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 85
4.0
Density, g/cm3 10
7.8
Embodied Carbon, kg CO2/kg material 6.3
1.8
Embodied Energy, MJ/kg 100
23
Embodied Water, L/kg 660
61

Common Calculations

Stiffness to Weight: Axial, points 1.3
13
Stiffness to Weight: Bending, points 9.2
24
Strength to Weight: Axial, points 0.9
17
Strength to Weight: Bending, points 2.2
17
Thermal Diffusivity, mm2/s 25
11
Thermal Shock Resistance, points 3.7
14

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0
Antimony (Sb), % 0.5 to 3.0
0
Arsenic (As), % 0 to 0.030
0
Bismuth (Bi), % 0 to 0.25
0
Cadmium (Cd), % 0 to 0.0050
0
Carbon (C), % 0
0.050 to 0.15
Chromium (Cr), % 0
2.7 to 3.4
Copper (Cu), % 0 to 0.080
0
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
94.3 to 96.2
Lead (Pb), % 75.9 to 80
0
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 0
0.8 to 1.1
Nickel (Ni), % 0 to 0.010
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0
0 to 0.5
Silver (Ag), % 0 to 0.1
0
Sulfur (S), % 0
0 to 0.025
Tin (Sn), % 19.5 to 20.5
0
Zinc (Zn), % 0 to 0.0010
0