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Solder Alloy 121 vs. S42035 Stainless Steel

Solder alloy 121 belongs to the otherwise unclassified metals classification, while S42035 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 S42035 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 11
160
Elastic (Young's, Tensile) Modulus, GPa 21
200
Elongation at Break, % 25
18
Poisson's Ratio 0.43
0.28
Shear Modulus, GPa 7.5
77
Tensile Strength: Ultimate (UTS), MPa 32
630

Thermal Properties

Latent Heat of Fusion, J/g 29
280
Melting Completion (Liquidus), °C 290
1450
Melting Onset (Solidus), °C 230
1400
Specific Heat Capacity, J/kg-K 140
480
Thermal Conductivity, W/m-K 31
27
Thermal Expansion, µm/m-K 28
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.8
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 7.4
3.2

Otherwise Unclassified Properties

Base Metal Price, % relative 80
9.5
Density, g/cm3 11
7.8
Embodied Carbon, kg CO2/kg material 5.6
2.4
Embodied Energy, MJ/kg 93
34
Embodied Water, L/kg 580
110

Common Calculations

Stiffness to Weight: Axial, points 1.1
14
Stiffness to Weight: Bending, points 8.6
25
Strength to Weight: Axial, points 0.84
22
Strength to Weight: Bending, points 2.1
21
Thermal Diffusivity, mm2/s 20
7.2
Thermal Shock Resistance, points 3.9
22

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 0.080
Chromium (Cr), % 0
13.5 to 15.5
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
78.1 to 85
Lead (Pb), % 83.4 to 85.5
0
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
0.2 to 1.2
Nickel (Ni), % 0 to 0.010
1.0 to 2.5
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0
0 to 1.0
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
0.3 to 0.5
Zinc (Zn), % 0 to 0.0010
0