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 12163) vs CuZn40 (EN) (EN 12163)
| Element | CuZn40 (EN 12163) | CuZn40 (EN) | Overlap |
|---|---|---|---|
| Cu | — | 59–62% | — |
| Zn | — | — | — |
Mechanical properties
Compatibility verdict
CuZn40 and CuZn40: 100% composition match
Related materials
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2.0401The most widely used free-cutting brass (machinability index 100%). Excellent for high-speed automatic lathe work. Used for turned parts, faucets, valves, fittings, screws, nuts, electrical connectors, and watch components. Also known as MS58.
CuSn8
2.1030Phosphor bronze with 8% tin. High mechanical strength, excellent wear resistance, good corrosion resistance (especially seawater). Self-lubricating sliding properties. Used for heavy-duty bearings, gears, worm wheels, springs, sliding elements, and connectors.
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.
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