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Solder Alloy 121 vs. S44635 Stainless Steel

Solder alloy 121 belongs to the otherwise unclassified metals classification, while S44635 stainless steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is solder alloy 121 and the bottom bar is S44635 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 11
240
Elastic (Young's, Tensile) Modulus, GPa 21
210
Elongation at Break, % 25
23
Poisson's Ratio 0.43
0.27
Shear Modulus, GPa 7.5
81
Tensile Strength: Ultimate (UTS), MPa 32
710

Thermal Properties

Latent Heat of Fusion, J/g 29
300
Melting Completion (Liquidus), °C 290
1460
Melting Onset (Solidus), °C 230
1420
Specific Heat Capacity, J/kg-K 140
470
Thermal Conductivity, W/m-K 31
16
Thermal Expansion, µm/m-K 28
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.8
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 7.4
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 80
22
Density, g/cm3 11
7.8
Embodied Carbon, kg CO2/kg material 5.6
4.4
Embodied Energy, MJ/kg 93
62
Embodied Water, L/kg 580
170

Common Calculations

Stiffness to Weight: Axial, points 1.1
15
Stiffness to Weight: Bending, points 8.6
25
Strength to Weight: Axial, points 0.84
25
Strength to Weight: Bending, points 2.1
23
Thermal Diffusivity, mm2/s 20
4.4
Thermal Shock Resistance, points 3.9
23

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0
Antimony (Sb), % 0 to 0.5
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 to 0.025
Chromium (Cr), % 0
24.5 to 26
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
61.5 to 68.5
Lead (Pb), % 83.4 to 85.5
0
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0 to 0.010
3.5 to 4.5
Niobium (Nb), % 0
0.2 to 0.8
Nitrogen (N), % 0
0 to 0.035
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 0.75
Silver (Ag), % 0 to 0.1
0
Sulfur (S), % 0
0 to 0.030
Tin (Sn), % 14.5 to 15.5
0
Titanium (Ti), % 0
0.2 to 0.8
Zinc (Zn), % 0 to 0.0010
0