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EN 1.6957 Steel vs. 7175 Aluminum

EN 1.6957 steel belongs to the iron alloys classification, while 7175 aluminum belongs to the aluminum 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 EN 1.6957 steel and the bottom bar is 7175 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
70
Elongation at Break, % 18
3.8 to 5.9
Fatigue Strength, MPa 530
150 to 180
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
26
Shear Strength, MPa 570
290 to 330
Tensile Strength: Ultimate (UTS), MPa 930
520 to 570
Tensile Strength: Yield (Proof), MPa 780
430 to 490

Thermal Properties

Latent Heat of Fusion, J/g 250
380
Maximum Temperature: Mechanical, °C 450
180
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1420
480
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 47
140
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
33
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
99

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
10
Density, g/cm3 7.9
3.0
Embodied Carbon, kg CO2/kg material 2.1
8.2
Embodied Energy, MJ/kg 29
150
Embodied Water, L/kg 60
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
18 to 29
Resilience: Unit (Modulus of Resilience), kJ/m3 1630
1310 to 1730
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
46
Strength to Weight: Axial, points 33
48 to 52
Strength to Weight: Bending, points 27
48 to 51
Thermal Diffusivity, mm2/s 13
53
Thermal Shock Resistance, points 27
23 to 25

Alloy Composition

Aluminum (Al), % 0
88 to 91.4
Carbon (C), % 0.22 to 0.32
0
Chromium (Cr), % 1.2 to 1.8
0.18 to 0.28
Copper (Cu), % 0
1.2 to 2.0
Iron (Fe), % 92.7 to 94.7
0 to 0.2
Magnesium (Mg), % 0
2.1 to 2.9
Manganese (Mn), % 0.15 to 0.4
0 to 0.1
Molybdenum (Mo), % 0.25 to 0.45
0
Nickel (Ni), % 3.4 to 4.0
0
Phosphorus (P), % 0 to 0.010
0
Silicon (Si), % 0 to 0.15
0 to 0.15
Sulfur (S), % 0 to 0.0070
0
Titanium (Ti), % 0
0 to 0.1
Vanadium (V), % 0.050 to 0.15
0
Zinc (Zn), % 0
5.1 to 6.1
Residuals, % 0
0 to 0.15