CuZn28
CW505LSingle-phase alpha brass — Cu 72%, Zn 28%. Excellent cold formability (deep drawing, spinning, bending). Better corrosion resistance than higher-Zn brasses (CuZn37, CuZn40). Used for cartridge cases (hence "cartridge brass"), musical instruments, lamp fittings, radiator cores, and decorative hardware. Good dezincification resistance.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS C26000 (approximate) | C26000 | REF |
| 🇪🇺 | EN | Europe | CuZn28 / CW505L | CW505L | 100% |
Sources: ASTM B36, EN 1652
Chemical composition comparison (wt%)
Side-by-side: CuZn28 (EN) (EN 1652) vs CuZn28 / CW505L (EN) (EN 1652)
| Element | CuZn28 (EN) | CuZn28 / CW505L (EN) | Overlap |
|---|---|---|---|
| Cu | 71–73% | 71–73% | OK |
| Zn | — | — | — |
| Pb | 0–0.05% | 0–0.05% | OK |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 300–380 | MPa |
| Yield Strength | 90–150 | MPa |
| Elongation | 40–55 | % |
| Elastic Modulus | ≥ 110 | GPa |
| Density | ≥ 8.44 | g/cm3 |
Compatibility verdict
CuZn28 and CuZn28 / CW505L: 100% composition match
Close equivalents but NOT identical.
Related materials
CuZn37
2.0321Lead-free alpha/alpha+beta brass (63% Cu, 37% Zn). Compromise between cold formability (CuZn35) and hot formability (CuZn40). The most widely used unleaded brass. Used for cartridge cases, radiator cores, lamp components, plumbing fixtures, and decorative hardware.
CuZn36Pb3
CW603NFree-cutting leaded brass — the benchmark for non-ferrous machinability (rated 100%). Lead particles act as chip breakers for excellent surface finish. Used for screw machine parts, fittings, valves, watch components, precision mechanics, and electrical connectors. Old DIN number 2.0375.
CuSn6
CW452KPhosphor bronze with 6% tin — better cold formability than CuSn8 at slightly lower strength. Excellent spring properties and fatigue resistance. Used for electrical connectors, spring contacts, switch parts, bellows, bourdon tubes, and precision springs.
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