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4145 Aluminum vs. S31730 Stainless Steel

4145 aluminum belongs to the aluminum alloys classification, while S31730 stainless steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (9, 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 4145 aluminum and the bottom bar is S31730 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 2.2
40
Fatigue Strength, MPa 48
170
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
77
Shear Strength, MPa 69
370
Tensile Strength: Ultimate (UTS), MPa 120
540
Tensile Strength: Yield (Proof), MPa 68
200

Thermal Properties

Latent Heat of Fusion, J/g 540
290
Maximum Temperature: Mechanical, °C 160
990
Melting Completion (Liquidus), °C 590
1430
Melting Onset (Solidus), °C 520
1390
Specific Heat Capacity, J/kg-K 880
470
Thermal Expansion, µm/m-K 21
16

Otherwise Unclassified Properties

Base Metal Price, % relative 10
24
Density, g/cm3 2.8
8.0
Embodied Carbon, kg CO2/kg material 7.6
4.6
Embodied Energy, MJ/kg 140
63
Embodied Water, L/kg 1040
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
170
Resilience: Unit (Modulus of Resilience), kJ/m3 31
99
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 12
19
Strength to Weight: Bending, points 19
18
Thermal Shock Resistance, points 5.5
12

Alloy Composition

Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0 to 0.15
17 to 19
Copper (Cu), % 3.3 to 4.7
4.0 to 5.0
Iron (Fe), % 0 to 0.8
52.4 to 61
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
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), % 9.3 to 10.7
0 to 1.0
Sulfur (S), % 0
0 to 0.010
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0