CuZn40
CW509LMuntz Metal / 60-40 Brass — at the alpha-beta boundary, the strongest common unleaded brass. Good hot workability (extrusion, forging, hot stamping). Poor cold formability vs lower-Zn brasses. Susceptible to dezincification in aggressive waters. Used for architectural extrusions, heat exchanger tubes, condenser plates, and marine hardware. ≈ UNS C28000.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS C28000 (Muntz Metal) | C28000 | REF |
| 🇪🇺 | EN | Europe | CuZn40 | CW509L | 100% |
Sources: ASTM B111, EN 12163
Chemical composition comparison (wt%)
Side-by-side: CuZn40 (EN) (EN 12163) vs CuZn40 (EN) (EN 12163)
| Element | CuZn40 (EN) | CuZn40 (EN) | Overlap |
|---|---|---|---|
| Cu | 59–62% | 59–62% | OK |
| Zn | — | — | — |
| Pb | 0–0.2% | 0–0.2% | OK |
| Fe | 0–0.1% | 0–0.1% | OK |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 350–420 | MPa |
| Yield Strength | 120–170 | MPa |
| Elongation | 35–50 | % |
| Hardness HB | 65–95 | HB |
| Elastic Modulus | ≥ 102 | GPa |
| Density | ≥ 8.39 | g/cm3 |
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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