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S15700 Stainless Steel vs. EN AC-45400 Aluminum

S15700 stainless steel belongs to the iron alloys classification, while EN AC-45400 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 S15700 stainless steel and the bottom bar is EN AC-45400 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 460
86
Elastic (Young's, Tensile) Modulus, GPa 200
72
Elongation at Break, % 1.1 to 29
6.7
Fatigue Strength, MPa 370 to 770
55
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
27
Tensile Strength: Ultimate (UTS), MPa 1180 to 1890
260
Tensile Strength: Yield (Proof), MPa 500 to 1770
130

Thermal Properties

Latent Heat of Fusion, J/g 290
470
Maximum Temperature: Mechanical, °C 870
170
Melting Completion (Liquidus), °C 1440
630
Melting Onset (Solidus), °C 1400
560
Specific Heat Capacity, J/kg-K 480
880
Thermal Conductivity, W/m-K 16
140
Thermal Expansion, µm/m-K 11
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
30
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
95

Otherwise Unclassified Properties

Base Metal Price, % relative 15
10
Density, g/cm3 7.8
2.8
Embodied Carbon, kg CO2/kg material 3.4
7.8
Embodied Energy, MJ/kg 47
150
Embodied Water, L/kg 140
1100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17 to 270
14
Resilience: Unit (Modulus of Resilience), kJ/m3 640 to 4660
110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
49
Strength to Weight: Axial, points 42 to 67
25
Strength to Weight: Bending, points 32 to 43
32
Thermal Diffusivity, mm2/s 4.2
54
Thermal Shock Resistance, points 39 to 63
12

Alloy Composition

Aluminum (Al), % 0.75 to 1.5
88.4 to 92.9
Carbon (C), % 0 to 0.090
0
Chromium (Cr), % 14 to 16
0
Copper (Cu), % 0
2.6 to 3.6
Iron (Fe), % 69.6 to 76.8
0 to 0.6
Lead (Pb), % 0
0 to 0.1
Magnesium (Mg), % 0
0 to 0.050
Manganese (Mn), % 0 to 1.0
0 to 0.55
Molybdenum (Mo), % 2.0 to 3.0
0
Nickel (Ni), % 6.5 to 7.7
0 to 0.1
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
4.5 to 6.0
Sulfur (S), % 0 to 0.030
0
Tin (Sn), % 0
0 to 0.050
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15