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S31727 Stainless Steel vs. Solder Alloy 121

S31727 stainless steel belongs to the iron alloys classification, while solder alloy 121 belongs to the otherwise unclassified metals. There are 21 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is S31727 stainless steel and the bottom bar is solder alloy 121.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
11
Elastic (Young's, Tensile) Modulus, GPa 200
21
Elongation at Break, % 40
25
Poisson's Ratio 0.28
0.43
Shear Modulus, GPa 78
7.5
Tensile Strength: Ultimate (UTS), MPa 630
32

Thermal Properties

Latent Heat of Fusion, J/g 290
29
Melting Completion (Liquidus), °C 1440
290
Melting Onset (Solidus), °C 1390
230
Specific Heat Capacity, J/kg-K 470
140
Thermal Expansion, µm/m-K 16
28

Otherwise Unclassified Properties

Base Metal Price, % relative 24
80
Density, g/cm3 8.0
11
Embodied Carbon, kg CO2/kg material 4.7
5.6
Embodied Energy, MJ/kg 64
93
Embodied Water, L/kg 180
580

Common Calculations

Stiffness to Weight: Axial, points 14
1.1
Stiffness to Weight: Bending, points 24
8.6
Strength to Weight: Axial, points 22
0.84
Strength to Weight: Bending, points 20
2.1
Thermal Shock Resistance, points 14
3.9

Alloy Composition

Aluminum (Al), % 0
0 to 0.0010
Antimony (Sb), % 0
0 to 0.5
Arsenic (As), % 0
0 to 0.030
Bismuth (Bi), % 0
0 to 0.25
Cadmium (Cd), % 0
0 to 0.0050
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17.5 to 19
0
Copper (Cu), % 2.8 to 4.0
0 to 0.080
Gold (Au), % 0
0 to 0.050
Indium (In), % 0
0 to 0.1
Iron (Fe), % 53.7 to 61.3
0 to 0.020
Lead (Pb), % 0
83.4 to 85.5
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 3.8 to 4.5
0
Nickel (Ni), % 14.5 to 16.5
0 to 0.010
Nitrogen (N), % 0.15 to 0.21
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 1.0
0
Silver (Ag), % 0
0 to 0.1
Sulfur (S), % 0 to 0.030
0
Tin (Sn), % 0
14.5 to 15.5
Zinc (Zn), % 0
0 to 0.0010