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Solder Alloy 121 vs. S20910 Stainless Steel

Solder alloy 121 belongs to the otherwise unclassified metals classification, while S20910 stainless steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is solder alloy 121 and the bottom bar is S20910 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 11
230 to 290
Elastic (Young's, Tensile) Modulus, GPa 21
200
Elongation at Break, % 25
14 to 39
Poisson's Ratio 0.43
0.28
Shear Modulus, GPa 7.5
79
Tensile Strength: Ultimate (UTS), MPa 32
780 to 940

Thermal Properties

Latent Heat of Fusion, J/g 29
300
Melting Completion (Liquidus), °C 290
1420
Melting Onset (Solidus), °C 230
1380
Specific Heat Capacity, J/kg-K 140
480
Thermal Conductivity, W/m-K 31
13
Thermal Expansion, µm/m-K 28
16

Otherwise Unclassified Properties

Base Metal Price, % relative 80
22
Density, g/cm3 11
7.8
Embodied Carbon, kg CO2/kg material 5.6
4.8
Embodied Energy, MJ/kg 93
68
Embodied Water, L/kg 580
180

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
28 to 33
Strength to Weight: Bending, points 2.1
24 to 27
Thermal Diffusivity, mm2/s 20
3.6
Thermal Shock Resistance, points 3.9
17 to 21

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 0.060
Chromium (Cr), % 0
20.5 to 23.5
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
52.1 to 62.1
Lead (Pb), % 83.4 to 85.5
0
Manganese (Mn), % 0
4.0 to 6.0
Molybdenum (Mo), % 0
1.5 to 3.0
Nickel (Ni), % 0 to 0.010
11.5 to 13.5
Niobium (Nb), % 0
0.1 to 0.3
Nitrogen (N), % 0
0.2 to 0.4
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
Vanadium (V), % 0
0.1 to 0.3
Zinc (Zn), % 0 to 0.0010
0