Weight %. Maximum zinc for maximum hot-forming economy — without lead.
| Element | Symbol | Min % | Max % |
|---|---|---|---|
| Copper | Cu | 57.0 | 59.0 |
| Zinc | Zn | Balance | |
| Lead (max) ✓ | Pb | — | 0.20 |
| Iron | Fe | — | 0.30 |
Bars show the range from the table: bar length at mid-range, zinc as the remainder.
Strength values are the ranges for rod across supply conditions (Copper Development Association UK). Physical properties are typical values. The EN 10204 3.1 certificate reports the values of the supplied bar.
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength | range across supply conditions | 360–500 | MPa |
| 0.2 % Proof Stress | range across supply conditions | 220–350 | MPa |
| Elongation | range across supply conditions | 20–2 | % |
| Hardness | range across supply conditions | 95–170 | HV |
| Hot Forging Temp | — | 650–800 | °C |
| Density | at 20 °C | 8.4 | g/cm³ |
| Melting Range | solidus–liquidus | 870–890 | °C |
| Thermal Conductivity | typical | 112 | W/(m·K) |
| Electrical Conductivity | typical (15.5 MS/m) | 27 | %IACS |
| Thermal Expansion | typical | 21.2 | ×10⁻⁶/K |
| Modulus of Elasticity | at 20 °C, annealed | 106 | GPa |
| Machinability | CDA UK machinability index (CW614N = 100) | 50 | index |
| Standard | Designation |
|---|---|
| EN (Europe) | CW510L / CuZn42 |
| ASTM (USA) | C28000 (close) |
| BS (UK legacy) | none listed |
| DIN (Germany) | CuZn42 |
| ISO | CuZn42 |
CW510L (CuZn42) is a high-zinc brass without lead addition (Pb ≤0.2%) 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, with one condition. No lead is added to CW510L, but EN 12165 / EN 12167 allow up to 0.2% Pb as an impurity, and the RoHS threshold is 0.1%. Heats with Pb ≤0.10% are compliant without Exemption 6(c); heats between 0.1% and 0.2% rely on 6(c) like any other copper alloy. If you need exemption-free material, specify Pb ≤0.10% on the order and check the EN 10204 3.1 certificate.
It rates around 50% machinability (CDA UK machinability index) — 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.
Write the standard and designation together, for example “CW510L / CuZn42”. The table above gives values by condition (annealed); state the condition or a minimum property on the drawing when it matters. Tolerances follow ISO 2768-m unless the title block says otherwise.
The mill’s EN 10204 Type 3.1 inspection certificate for the alloy lot reports the measured chemical composition and mechanical test results. Brassland adds a Certificate of Conformity for the order and RoHS and REACH declarations at no charge; PPAP Level 1–3 packages are available for OEM qualification.
CW510L / CuZn42. The UNS equivalent is C28000 (close).Primary source: Copper Development Association UK — brass rods and sections.
Low-lead 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: September 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.
Brassland machines CW510L into brass turned parts and CNC machined components to your drawing in Jamnagar, India, including precision turned brass components on 28+ Swiss-type lathes, with an EN 10204 3.1 certificate on every shipment.