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4115 Aluminum vs. S31730 Stainless Steel

4115 aluminum belongs to the aluminum alloys classification, while S31730 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is 4115 aluminum and the bottom bar is S31730 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 38 to 68
180
Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 1.1 to 11
40
Fatigue Strength, MPa 39 to 76
170
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
77
Shear Strength, MPa 71 to 130
370
Tensile Strength: Ultimate (UTS), MPa 120 to 220
540
Tensile Strength: Yield (Proof), MPa 39 to 190
200

Thermal Properties

Latent Heat of Fusion, J/g 420
290
Maximum Temperature: Mechanical, °C 160
990
Melting Completion (Liquidus), °C 640
1430
Melting Onset (Solidus), °C 590
1390
Specific Heat Capacity, J/kg-K 900
470
Thermal Expansion, µm/m-K 23
16

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
24
Density, g/cm3 2.7
8.0
Embodied Carbon, kg CO2/kg material 8.1
4.6
Embodied Energy, MJ/kg 150
63
Embodied Water, L/kg 1160
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.1 to 10
170
Resilience: Unit (Modulus of Resilience), kJ/m3 11 to 270
99
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 12 to 23
19
Strength to Weight: Bending, points 20 to 30
18
Thermal Shock Resistance, points 5.2 to 9.9
12

Alloy Composition

Aluminum (Al), % 94.6 to 97.4
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
17 to 19
Copper (Cu), % 0.1 to 0.5
4.0 to 5.0
Iron (Fe), % 0 to 0.7
52.4 to 61
Magnesium (Mg), % 0.1 to 0.5
0
Manganese (Mn), % 0.6 to 1.2
0 to 2.0
Molybdenum (Mo), % 0
3.0 to 4.0
Nickel (Ni), % 0
15 to 16.5
Nitrogen (N), % 0
0 to 0.045
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 1.8 to 2.2
0 to 1.0
Sulfur (S), % 0
0 to 0.010
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0