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4145 Aluminum vs. S15700 Stainless Steel

4145 aluminum belongs to the aluminum alloys classification, while S15700 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 S15700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 2.2
1.1 to 29
Fatigue Strength, MPa 48
370 to 770
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
77
Shear Strength, MPa 69
770 to 1070
Tensile Strength: Ultimate (UTS), MPa 120
1180 to 1890
Tensile Strength: Yield (Proof), MPa 68
500 to 1770

Thermal Properties

Latent Heat of Fusion, J/g 540
290
Maximum Temperature: Mechanical, °C 160
870
Melting Completion (Liquidus), °C 590
1440
Melting Onset (Solidus), °C 520
1400
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 100
16
Thermal Expansion, µm/m-K 21
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 84
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 10
15
Density, g/cm3 2.8
7.8
Embodied Carbon, kg CO2/kg material 7.6
3.4
Embodied Energy, MJ/kg 140
47
Embodied Water, L/kg 1040
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
17 to 270
Resilience: Unit (Modulus of Resilience), kJ/m3 31
640 to 4660
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 12
42 to 67
Strength to Weight: Bending, points 19
32 to 43
Thermal Diffusivity, mm2/s 42
4.2
Thermal Shock Resistance, points 5.5
39 to 63

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0.75 to 1.5
Carbon (C), % 0
0 to 0.090
Chromium (Cr), % 0 to 0.15
14 to 16
Copper (Cu), % 3.3 to 4.7
0
Iron (Fe), % 0 to 0.8
69.6 to 76.8
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0 to 1.0
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0
6.5 to 7.7
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 9.3 to 10.7
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0