200GPasourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018)
7,861kg/m³sourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018)
Strength to weight
59kN·m/kg25% higher
47.3kN·m/kg
Stiffness to weight
26.2MN·m/kg3% higher
25.4MN·m/kg
Poisson's ratio
not sourced
0.32sourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018)
51.9W/m·Ksourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018)
486J/kg·Ksourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018)
Heats up and cools (diffusivity)
36.8mm²/s2.71x faster
13.6mm²/s
Thermal shock resistance
not sourced
5,473W/m
Values for
A380 aluminium high-pressure die-casting alloy, typical properties; Rheocast Company (aluminium die caster, Germantown WI) A380 alloy data page.
AISI 1018 cold drawn bar (Niagara LaSalle, cold-finished bar producer)
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Is Aluminum A380 stronger than Steel AISI 1018?
Steel AISI 1018 is stronger: its yield strength is 372 MPa against 160 MPa for Aluminum A380 (2.33x).
Which is lighter, Aluminum A380 or Steel AISI 1018?
Aluminum A380 is lighter: 2,713 kg/m³ against 7,861 kg/m³ for Steel AISI 1018.
Which is stiffer, Aluminum A380 or Steel AISI 1018?
Steel AISI 1018 is stiffer: Young's modulus 200 GPa against 71 GPa for Aluminum A380, so the same part in Steel AISI 1018 deflects less under the same load.
Which is lighter for the same job, Aluminum A380 or Steel AISI 1018?
For the same stiffness or strength: Aluminum A380 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
Part that must be
Aluminum A380
Steel AISI 1018
Stiff rod or tie (tension)
lighter
3% heavier
Stiff beam (bending)
lighter
1.73x heavier
Stiff panel or plate
lighter
2.05x heavier
Strong rod or tie
lighter
25% heavier
Strong beam
lighter
1.65x heavier
Strong panel or plate
lighter
1.9x heavier
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Which conducts heat better, Aluminum A380 or Steel AISI 1018?
Aluminum A380 conducts heat better: 96.2 W/m·K against 51.9 W/m·K for Steel AISI 1018.
Which expands less with temperature?
Steel AISI 1018 expands less: 12 µm/m·K against 21.8 µm/m·K for Aluminum A380.