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EN 1.4938 Stainless Steel vs. 771.0 Aluminum

EN 1.4938 stainless steel belongs to the iron alloys classification, while 771.0 aluminum belongs to the aluminum alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 1.4938 stainless steel and the bottom bar is 771.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 16 to 17
1.7 to 6.5
Fatigue Strength, MPa 390 to 520
92 to 180
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 76
26
Tensile Strength: Ultimate (UTS), MPa 870 to 1030
250 to 370
Tensile Strength: Yield (Proof), MPa 640 to 870
210 to 350

Thermal Properties

Latent Heat of Fusion, J/g 270
380
Maximum Temperature: Mechanical, °C 750
180
Melting Completion (Liquidus), °C 1460
630
Melting Onset (Solidus), °C 1420
620
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 30
140 to 150
Thermal Expansion, µm/m-K 11
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
27
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
82

Otherwise Unclassified Properties

Base Metal Price, % relative 10
9.5
Density, g/cm3 7.8
3.0
Embodied Carbon, kg CO2/kg material 3.3
8.0
Embodied Energy, MJ/kg 47
150
Embodied Water, L/kg 110
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 160
4.4 to 20
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1920
310 to 900
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
46
Strength to Weight: Axial, points 31 to 37
23 to 35
Strength to Weight: Bending, points 26 to 29
29 to 39
Thermal Diffusivity, mm2/s 8.1
54 to 58
Thermal Shock Resistance, points 30 to 35
11 to 16

Alloy Composition

Aluminum (Al), % 0
90.5 to 92.5
Carbon (C), % 0.080 to 0.15
0
Chromium (Cr), % 11 to 12.5
0.060 to 0.2
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 80.5 to 84.8
0 to 0.15
Magnesium (Mg), % 0
0.8 to 1.0
Manganese (Mn), % 0.4 to 0.9
0 to 0.1
Molybdenum (Mo), % 1.5 to 2.0
0
Nickel (Ni), % 2.0 to 3.0
0
Nitrogen (N), % 0.020 to 0.040
0
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0 to 0.15
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 0
0.1 to 0.2
Vanadium (V), % 0.25 to 0.4
0
Zinc (Zn), % 0
6.5 to 7.5
Residuals, % 0
0 to 0.15