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Solder Alloy 121 vs. S81921 Stainless Steel

Solder alloy 121 belongs to the otherwise unclassified metals classification, while S81921 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 S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 11
260
Elastic (Young's, Tensile) Modulus, GPa 21
200
Elongation at Break, % 25
29
Poisson's Ratio 0.43
0.28
Shear Modulus, GPa 7.5
79
Tensile Strength: Ultimate (UTS), MPa 32
710

Thermal Properties

Latent Heat of Fusion, J/g 29
290
Melting Completion (Liquidus), °C 290
1430
Melting Onset (Solidus), °C 230
1390
Specific Heat Capacity, J/kg-K 140
480
Thermal Conductivity, W/m-K 31
15
Thermal Expansion, µm/m-K 28
13

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
14
Density, g/cm3 11
7.7
Embodied Carbon, kg CO2/kg material 5.6
2.9
Embodied Energy, MJ/kg 93
41
Embodied Water, L/kg 580
150

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
25
Strength to Weight: Bending, points 2.1
23
Thermal Diffusivity, mm2/s 20
4.0
Thermal Shock Resistance, points 3.9
20

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 0.030
Chromium (Cr), % 0
19 to 22
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
66.7 to 75.9
Lead (Pb), % 83.4 to 85.5
0
Manganese (Mn), % 0
2.0 to 4.0
Molybdenum (Mo), % 0
1.0 to 2.0
Nickel (Ni), % 0 to 0.010
2.0 to 4.0
Nitrogen (N), % 0
0.14 to 0.2
Phosphorus (P), % 0
0 to 0.040
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
Zinc (Zn), % 0 to 0.0010
0