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S20910 Stainless Steel vs. 7049A Aluminum

S20910 stainless steel belongs to the iron alloys classification, while 7049A aluminum belongs to the aluminum alloys. There are 28 material properties with values for both materials. Properties with values for just one material (6, 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 S20910 stainless steel and the bottom bar is 7049A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
71
Elongation at Break, % 14 to 39
5.0 to 5.7
Fatigue Strength, MPa 310 to 460
180
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 79
27
Shear Strength, MPa 500 to 570
340 to 350
Tensile Strength: Ultimate (UTS), MPa 780 to 940
580 to 590
Tensile Strength: Yield (Proof), MPa 430 to 810
500 to 530

Thermal Properties

Latent Heat of Fusion, J/g 300
370
Maximum Temperature: Mechanical, °C 1080
200
Melting Completion (Liquidus), °C 1420
640
Melting Onset (Solidus), °C 1380
430
Specific Heat Capacity, J/kg-K 480
850
Thermal Conductivity, W/m-K 13
130
Thermal Expansion, µm/m-K 16
24

Otherwise Unclassified Properties

Base Metal Price, % relative 22
10
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 4.8
8.2
Embodied Energy, MJ/kg 68
150
Embodied Water, L/kg 180
1100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 260
28 to 32
Resilience: Unit (Modulus of Resilience), kJ/m3 460 to 1640
1800 to 1990
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
44
Strength to Weight: Axial, points 28 to 33
52 to 53
Strength to Weight: Bending, points 24 to 27
50 to 51
Thermal Diffusivity, mm2/s 3.6
50
Thermal Shock Resistance, points 17 to 21
25

Alloy Composition

Aluminum (Al), % 0
84.6 to 89.5
Carbon (C), % 0 to 0.060
0
Chromium (Cr), % 20.5 to 23.5
0.050 to 0.25
Copper (Cu), % 0
1.2 to 1.9
Iron (Fe), % 52.1 to 62.1
0 to 0.5
Magnesium (Mg), % 0
2.1 to 3.1
Manganese (Mn), % 4.0 to 6.0
0 to 0.5
Molybdenum (Mo), % 1.5 to 3.0
0
Nickel (Ni), % 11.5 to 13.5
0
Niobium (Nb), % 0.1 to 0.3
0
Nitrogen (N), % 0.2 to 0.4
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.75
0 to 0.4
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.25
Vanadium (V), % 0.1 to 0.3
0
Zinc (Zn), % 0
7.2 to 8.4
Zirconium (Zr), % 0
0 to 0.25
Residuals, % 0
0 to 0.15