MakeItFrom.com
Menu (ESC)

ACI-ASTM CN7MS Steel vs. 8021 Aluminum

ACI-ASTM CN7MS steel belongs to the iron alloys classification, while 8021 aluminum belongs to the aluminum alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, 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 ACI-ASTM CN7MS steel and the bottom bar is 8021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 39
2.3
Fatigue Strength, MPa 200
61
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
26
Tensile Strength: Ultimate (UTS), MPa 540
160
Tensile Strength: Yield (Proof), MPa 230
130

Thermal Properties

Latent Heat of Fusion, J/g 340
400
Maximum Temperature: Mechanical, °C 1040
170
Melting Completion (Liquidus), °C 1400
650
Melting Onset (Solidus), °C 1350
640
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 12
220
Thermal Expansion, µm/m-K 16
23

Otherwise Unclassified Properties

Base Metal Price, % relative 28
9.0
Density, g/cm3 7.9
2.8
Embodied Carbon, kg CO2/kg material 5.1
8.1
Embodied Energy, MJ/kg 71
150
Embodied Water, L/kg 180
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
3.4
Resilience: Unit (Modulus of Resilience), kJ/m3 140
130
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
49
Strength to Weight: Axial, points 19
16
Strength to Weight: Bending, points 19
23
Thermal Diffusivity, mm2/s 3.2
88
Thermal Shock Resistance, points 13
7.0

Alloy Composition

Aluminum (Al), % 0
98 to 98.8
Carbon (C), % 0 to 0.070
0
Chromium (Cr), % 18 to 20
0
Copper (Cu), % 1.5 to 2.0
0 to 0.050
Iron (Fe), % 45.4 to 53.5
1.2 to 1.7
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 2.5 to 3.0
0
Nickel (Ni), % 22 to 25
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 2.5 to 3.5
0 to 0.15
Sulfur (S), % 0 to 0.030
0
Residuals, % 0
0 to 0.15