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S20910 Stainless Steel vs. 4145 Aluminum

S20910 stainless steel belongs to the iron alloys classification, while 4145 aluminum belongs to the aluminum alloys. There are 28 material properties with values for both materials. Properties with values for just one material (7, 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 4145 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
73
Elongation at Break, % 14 to 39
2.2
Fatigue Strength, MPa 310 to 460
48
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 79
28
Shear Strength, MPa 500 to 570
69
Tensile Strength: Ultimate (UTS), MPa 780 to 940
120
Tensile Strength: Yield (Proof), MPa 430 to 810
68

Thermal Properties

Latent Heat of Fusion, J/g 300
540
Maximum Temperature: Mechanical, °C 1080
160
Melting Completion (Liquidus), °C 1420
590
Melting Onset (Solidus), °C 1380
520
Specific Heat Capacity, J/kg-K 480
880
Thermal Conductivity, W/m-K 13
100
Thermal Expansion, µm/m-K 16
21

Otherwise Unclassified Properties

Base Metal Price, % relative 22
10
Density, g/cm3 7.8
2.8
Embodied Carbon, kg CO2/kg material 4.8
7.6
Embodied Energy, MJ/kg 68
140
Embodied Water, L/kg 180
1040

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 260
2.3
Resilience: Unit (Modulus of Resilience), kJ/m3 460 to 1640
31
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 28 to 33
12
Strength to Weight: Bending, points 24 to 27
19
Thermal Diffusivity, mm2/s 3.6
42
Thermal Shock Resistance, points 17 to 21
5.5

Alloy Composition

Aluminum (Al), % 0
83 to 87.4
Carbon (C), % 0 to 0.060
0
Chromium (Cr), % 20.5 to 23.5
0 to 0.15
Copper (Cu), % 0
3.3 to 4.7
Iron (Fe), % 52.1 to 62.1
0 to 0.8
Magnesium (Mg), % 0
0 to 0.15
Manganese (Mn), % 4.0 to 6.0
0 to 0.15
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
9.3 to 10.7
Sulfur (S), % 0 to 0.030
0
Vanadium (V), % 0.1 to 0.3
0
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15