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EN 1.4981 Stainless Steel vs. 238.0 Aluminum

EN 1.4981 stainless steel belongs to the iron alloys classification, while 238.0 aluminum belongs to the aluminum alloys. There are 29 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 EN 1.4981 stainless steel and the bottom bar is 238.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
76
Elongation at Break, % 39
1.5
Fatigue Strength, MPa 210
110
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
28
Tensile Strength: Ultimate (UTS), MPa 610
210
Tensile Strength: Yield (Proof), MPa 240
170

Thermal Properties

Latent Heat of Fusion, J/g 290
430
Maximum Temperature: Mechanical, °C 940
170
Melting Completion (Liquidus), °C 1440
600
Melting Onset (Solidus), °C 1400
510
Specific Heat Capacity, J/kg-K 470
840
Thermal Conductivity, W/m-K 16
100
Thermal Expansion, µm/m-K 16
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
25
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
67

Otherwise Unclassified Properties

Base Metal Price, % relative 25
12
Density, g/cm3 7.9
3.4
Embodied Carbon, kg CO2/kg material 4.8
7.4
Embodied Energy, MJ/kg 67
140
Embodied Water, L/kg 150
1040

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
2.9
Resilience: Unit (Modulus of Resilience), kJ/m3 150
180
Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 24
42
Strength to Weight: Axial, points 21
17
Strength to Weight: Bending, points 20
23
Thermal Diffusivity, mm2/s 4.3
37
Thermal Shock Resistance, points 14
9.1

Alloy Composition

Aluminum (Al), % 0
81.9 to 84.9
Carbon (C), % 0.040 to 0.1
0
Chromium (Cr), % 15.5 to 17.5
0
Copper (Cu), % 0
9.5 to 10.5
Iron (Fe), % 59.6 to 66.7
1.0 to 1.5
Magnesium (Mg), % 0
0 to 0.25
Manganese (Mn), % 0 to 1.5
0
Molybdenum (Mo), % 1.6 to 2.0
0
Nickel (Ni), % 15.5 to 17.5
0
Niobium (Nb), % 0.4 to 1.2
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.3 to 0.6
3.6 to 4.4
Sulfur (S), % 0 to 0.015
0
Zinc (Zn), % 0
1.0 to 1.5