Weight %. Maximum zinc for maximum hot-forming economy — without lead.
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Copper | Cu | 57.0 | 59.0 | 58.0 |
| Zinc | Zn | Balance | ~42 | |
| Lead (max) ✓ | Pb | — | 0.10 | ≤0.05 |
| Iron | Fe | — | 0.30 | 0.05 |
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength (Rm) | annealed | 380–440 | MPa |
| Proof Stress (Rp0.2) | annealed | ≥150 | MPa |
| Elongation (A) | annealed | ≥25 | % |
| Hardness | annealed | 90–115 | HB |
| Hot Forging Temp | — | 650–800 | °C |
| Machinability | vs C36000 = 100 | ~48% | — |
| Density | — | 8.37 | g/cm³ |
| Melting Range | solidus–liquidus | 890–900 | °C |
| Standard | Designation |
|---|---|
| EN (Europe) | CW510L / CuZn42 |
| ASTM (USA) | C28000 (close) |
| BS (UK legacy) | CZ110 (close) |
| DIN (Germany) | CuZn42 |
| ISO | CuZn42 |
CW510L (CuZn42) is a high-zinc, lead-free brass specified in EN 12167 whose duplex structure gives outstanding workability at forging temperature. It is used for hot-forged and extruded structural components where the part must contain no added lead.
Yes — CW510L is lead-free by composition, so it is RoHS compliant without relying on Exemption 6(c), and is unaffected by the exemption's expected tightening after June 2027.
It rates around 48% machinability — roughly half the cutting performance of CW614N — with tougher, longer chips. Plan finish-machining allowances accordingly; the alloy's strength is in hot forming, with machining as a secondary operation.
Choose CW510L for hot-forged or extruded structural parts where cost matters and dezincification resistance is not required. Choose CW724R silicon brass when the part is wetted by potable water or needs DZR performance plus better machinability.
Lead-free forgings, finish-machined to your drawing. ISO 9001:2015. Quote within 24 hours.
Request a QuoteComposition ranges, mechanical properties, machinability ratings and regulatory data on this page are cross-referenced against the publishers below. Tolerances and minimum values are taken from the relevant published standard at the time of writing — for procurement specification, always reference the current published edition.
Last reviewed: June 2026. EN/ISO/ASTM standards are updated periodically. This datasheet reflects the editions listed; for safety-critical or contract-critical applications, always verify against the current published edition of the standard. For project-specific deviations or supplier-specific composition windows, request a Type 3.1 mill certificate (EN 10204) with your order.