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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Sources4 documents: Copper Development Association, Wieland
Brass C360
C36000 free-cutting brass, H02 half-hard rod 1 in. section (20% cold work), copper.org typical values
Copper C12200
C12200 phosphorus-deoxidized copper (DHP, the air-conditioning and refrigeration tube copper), tube annealed to 0.050 mm grain size (OS050), 0.065 in. wall, copper.org typical values
C12200 Alloy (copper.org)Copper Development Associationarchived copyCopper C12200 · Yield strength: typical, 0.5% extension under load, 0.065 in. tubeCopper C12200 · Ultimate tensile strength: typical, 0.065 in. tubeCopper C12200 · Elongation at break: typical, 0.065 in. tubeCopper C12200 · Young's modulus (stiffness): typicalCopper C12200 · Density: nominalCopper C12200 · Thermal conductivity: typical, 20 °CCopper C12200 · Thermal expansion: typical, mean 20-100 °CCopper C12200 · Specific heat: typical, 20 °CCopper C12200 · Melting point: liquidus
3
Wieland-Z30 (CuZn39Pb2, C37700) Data SheetWielandarchived copyBrass C360 · Poisson's ratio: base material: leaded free-machining brass CuZn39Pb2 (C37700), Wieland-Z30 rolled products, reference value at room temperature
4
Wieland-K19 (Cu-DHP, C12200) Data SheetWielandarchived copyCopper C12200 · Poisson's ratio: reference value at room temperature (Wieland-K19 = Cu-DHP = C12200, rolled products)
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 C360 stronger than Copper C12200?
Brass C360 is stronger: its yield strength is 310 MPa against 69 MPa for Copper C12200 (4.49x).
Which is lighter, Brass C360 or Copper C12200?
Brass C360 is lighter: 8,498 kg/m³ against 8,941 kg/m³ for Copper C12200.
Which is stiffer, Brass C360 or Copper C12200?
Copper C12200 is stiffer: Young's modulus 117 GPa against 96.5 GPa for Brass C360, so the same part in Copper C12200 deflects less under the same load.
Which is lighter for the same job, Brass C360 or Copper C12200?
For the same stiffness or strength: Brass C360 is lighter for a strong rod or tie, strong beam, strong panel or plate; Copper C12200 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate.
Part that must be
Brass C360
Copper C12200
Stiff rod or tie (tension)
15% heavier
lighter
Stiff beam (bending)
5% heavier
lighter
Stiff panel or plate
1% heavier
lighter
Strong rod or tie
lighter
4.73x heavier
Strong beam
lighter
2.86x heavier
Strong panel or plate
lighter
2.23x 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 is more ductile, Brass C360 or Copper C12200?
Copper C12200 stretches further before it breaks: 45% elongation at break against 25% for Brass C360.
Thermal
Which conducts heat better, Brass C360 or Copper C12200?
Copper C12200 conducts heat better: 339 W/m·K against 116 W/m·K for Brass C360.
Which expands less with temperature?
Copper C12200 expands less: 16.9 µm/m·K against 20.5 µm/m·K for Brass C360.