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S31730 Stainless Steel vs. EN AC-45400 Aluminum

S31730 stainless steel belongs to the iron alloys classification, while EN AC-45400 aluminum belongs to the aluminum alloys. There are 26 material properties with values for both materials. Properties with values for just one material (8, 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 S31730 stainless steel and the bottom bar is EN AC-45400 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
86
Elastic (Young's, Tensile) Modulus, GPa 200
72
Elongation at Break, % 40
6.7
Fatigue Strength, MPa 170
55
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
27
Tensile Strength: Ultimate (UTS), MPa 540
260
Tensile Strength: Yield (Proof), MPa 200
130

Thermal Properties

Latent Heat of Fusion, J/g 290
470
Maximum Temperature: Mechanical, °C 990
170
Melting Completion (Liquidus), °C 1430
630
Melting Onset (Solidus), °C 1390
560
Specific Heat Capacity, J/kg-K 470
880
Thermal Expansion, µm/m-K 16
22

Otherwise Unclassified Properties

Base Metal Price, % relative 24
10
Density, g/cm3 8.0
2.8
Embodied Carbon, kg CO2/kg material 4.6
7.8
Embodied Energy, MJ/kg 63
150
Embodied Water, L/kg 180
1100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
14
Resilience: Unit (Modulus of Resilience), kJ/m3 99
110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
49
Strength to Weight: Axial, points 19
25
Strength to Weight: Bending, points 18
32
Thermal Shock Resistance, points 12
12

Alloy Composition

Aluminum (Al), % 0
88.4 to 92.9
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17 to 19
0
Copper (Cu), % 4.0 to 5.0
2.6 to 3.6
Iron (Fe), % 52.4 to 61
0 to 0.6
Lead (Pb), % 0
0 to 0.1
Magnesium (Mg), % 0
0 to 0.050
Manganese (Mn), % 0 to 2.0
0 to 0.55
Molybdenum (Mo), % 3.0 to 4.0
0
Nickel (Ni), % 15 to 16.5
0 to 0.1
Nitrogen (N), % 0 to 0.045
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
4.5 to 6.0
Sulfur (S), % 0 to 0.010
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