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S17700 Stainless Steel vs. A384.0 Aluminum

S17700 stainless steel belongs to the iron alloys classification, while A384.0 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 S17700 stainless steel and the bottom bar is A384.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
74
Elongation at Break, % 1.0 to 23
2.5
Fatigue Strength, MPa 290 to 560
140
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 76
28
Shear Strength, MPa 740 to 940
200
Tensile Strength: Ultimate (UTS), MPa 1180 to 1650
330
Tensile Strength: Yield (Proof), MPa 430 to 1210
170

Thermal Properties

Latent Heat of Fusion, J/g 290
550
Maximum Temperature: Mechanical, °C 890
170
Melting Completion (Liquidus), °C 1440
610
Melting Onset (Solidus), °C 1400
510
Specific Heat Capacity, J/kg-K 480
880
Thermal Conductivity, W/m-K 15
96
Thermal Expansion, µm/m-K 11
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
23
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
73

Otherwise Unclassified Properties

Base Metal Price, % relative 13
11
Density, g/cm3 7.7
2.8
Embodied Carbon, kg CO2/kg material 2.8
7.5
Embodied Energy, MJ/kg 40
140
Embodied Water, L/kg 150
1010

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 15 to 210
6.9
Resilience: Unit (Modulus of Resilience), kJ/m3 460 to 3750
180
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 42 to 59
32
Strength to Weight: Bending, points 32 to 40
38
Thermal Diffusivity, mm2/s 4.1
39
Thermal Shock Resistance, points 39 to 54
15

Alloy Composition

Aluminum (Al), % 0.75 to 1.5
79.3 to 86.5
Carbon (C), % 0 to 0.090
0
Chromium (Cr), % 16 to 18
0
Copper (Cu), % 0
3.0 to 4.5
Iron (Fe), % 70.5 to 76.8
0 to 1.3
Magnesium (Mg), % 0
0 to 0.1
Manganese (Mn), % 0 to 1.0
0 to 0.5
Nickel (Ni), % 6.5 to 7.8
0 to 0.5
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
10.5 to 12
Sulfur (S), % 0 to 0.030
0
Tin (Sn), % 0
0 to 0.35
Zinc (Zn), % 0
0 to 1.0
Residuals, % 0
0 to 0.5