Thermal conductivity against densityHigher and further left: spreads more heat for its weightThermal expansion against thermal conductivityLower and further right: warps less when heated
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MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures (2003)U.S. Department of DefenseSteel AISI 1018 · Young's modulus (stiffness): base 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)Steel AISI 1018 · Density: base 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)Steel AISI 1018 · Poisson's ratio: base 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)Steel AISI 1018 · Thermal conductivity: base 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)Steel AISI 1018 · Specific heat: base 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)
5
Wieland-M30 (CuZn30, C26000) Data SheetWielandarchived copyBrass C260 · Poisson's ratio: reference value at room temperature (Wieland-M30 = CuZn30 = C26000, rolled products)
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S275JR Steel GradeOvakoSteel AISI 1018 · Thermal expansion: base material: unalloyed carbon steel, Ovako family table (S275JR, 'none alloyed structural steels', C <= 0.21%); mean 20-300 °C
Each number points to the document that states it, with the exact basis. Values without a number are computed from the sourced ones. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Mechanical
Is Brass C260 stronger than Steel AISI 1018?
Steel AISI 1018 is stronger: its yield strength is 372 MPa against 345 MPa for Brass C260 (8%).
Which is lighter, Brass C260 or Steel AISI 1018?
Steel AISI 1018 is lighter: 7,861 kg/m³ against 8,525 kg/m³ for Brass C260.
Which is stiffer, Brass C260 or Steel AISI 1018?
Steel AISI 1018 is stiffer: Young's modulus 200 GPa against 110 GPa for Brass C260, so the same part in Steel AISI 1018 deflects less under the same load.
Which is lighter for the same job, Brass C260 or Steel AISI 1018?
For the same stiffness or strength: Steel AISI 1018 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
Brass C260
Steel AISI 1018
Stiff rod or tie (tension)
1.97x heavier
lighter
Stiff beam (bending)
46% heavier
lighter
Stiff panel or plate
32% heavier
lighter
Strong rod or tie
17% heavier
lighter
Strong beam
14% heavier
lighter
Strong panel or plate
13% heavier
lighter
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 is more ductile, Brass C260 or Steel AISI 1018?
Brass C260 stretches further before it breaks: 23% elongation at break against 15% for Steel AISI 1018.
Thermal
Which conducts heat better, Brass C260 or Steel AISI 1018?
Brass C260 conducts heat better: 121 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 20 µm/m·K for Brass C260.