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S17700 Stainless Steel vs. 308.0 Aluminum

S17700 stainless steel belongs to the iron alloys classification, while 308.0 aluminum belongs to the aluminum alloys. There are 31 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 308.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 430
70
Elastic (Young's, Tensile) Modulus, GPa 200
73
Elongation at Break, % 1.0 to 23
2.0
Fatigue Strength, MPa 290 to 560
89
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 76
27
Shear Strength, MPa 740 to 940
150
Tensile Strength: Ultimate (UTS), MPa 1180 to 1650
190
Tensile Strength: Yield (Proof), MPa 430 to 1210
110

Thermal Properties

Latent Heat of Fusion, J/g 290
470
Maximum Temperature: Mechanical, °C 890
170
Melting Completion (Liquidus), °C 1440
620
Melting Onset (Solidus), °C 1400
540
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 15
140
Thermal Expansion, µm/m-K 11
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
37
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
110

Otherwise Unclassified Properties

Base Metal Price, % relative 13
10
Density, g/cm3 7.7
2.9
Embodied Carbon, kg CO2/kg material 2.8
7.7
Embodied Energy, MJ/kg 40
140
Embodied Water, L/kg 150
1080

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 15 to 210
3.3
Resilience: Unit (Modulus of Resilience), kJ/m3 460 to 3750
83
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
47
Strength to Weight: Axial, points 42 to 59
18
Strength to Weight: Bending, points 32 to 40
25
Thermal Diffusivity, mm2/s 4.1
55
Thermal Shock Resistance, points 39 to 54
9.2

Alloy Composition

Aluminum (Al), % 0.75 to 1.5
85.7 to 91
Carbon (C), % 0 to 0.090
0
Chromium (Cr), % 16 to 18
0
Copper (Cu), % 0
4.0 to 5.0
Iron (Fe), % 70.5 to 76.8
0 to 1.0
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
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
5.0 to 6.0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0
0 to 1.0
Residuals, % 0
0 to 0.5