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CW511L Lead Free Brass Casting
CW511L Lead Free Brass Casting
CW511L lead free brass casting is the European designation (EN 12420) for silicon-manganese lead-free brass, composition CuZn42Si2Mn, which is the wrought and hot-forged equivalent of the US C87850 silicon brass casting alloy. CW511L is a lead-free brass bar and forging material that, when machined from solid or used in hot-forged and subsequently machined form, produces components fully compliant with EU Drinking Water Directive 2020/2184/EU, WRAS (UK), KTW W270 (Germany), RoHS 2011/65/EU, and NSF/ANSI 372 via chemical equivalency to ASTM C87850. Electrical Accessories India supplies CW511L lead-free brass machined parts, CNC-machined components from bar, and machined castings from silicon brass to European market specifications.
CW511L Alloy Composition and Technical Properties
CW511L per EN 12420 uses silicon (1.5–2.5%) and manganese (0.3–0.8%) as lead-replacement elements in a copper-zinc (Cu ~57%, Zn ~42%) matrix. Silicon provides chip-breaking behaviour during machining and simultaneously imparts dezincification resistance, making CW511L suitable for aggressive water service without separate DZR-grade specification. The alloy is processed as hot-extrusion rod and bar (for machining-from-solid) and as hot-forgings (for valve and fitting bodies), achieving machinability of 60–75% relative to CW614N free-cutting brass.
| Property | Value |
|---|---|
| EN Designation | CW511L |
| EN Composition Name | CuZn42Si2Mn |
| Standard | EN 12420:2022 (Hot Forming Brass) |
| US Equivalent | C87850 (casting) / ASTM B371 |
| Cu Content | 55–59% |
| Zn Content | Balance (~40–43%) |
| Si Content | 1.5–2.5% |
| Mn Content | 0.3–0.8% |
| Pb Content | <0.09% (EU DWD / WRAS lead-free compliant) |
| Tensile Strength (annealed) | 340–420 MPa |
| Yield Strength | 170–250 MPa |
| Elongation | 15–25% |
| Hardness | 80–100 HB |
| Machinability | 60–75% (vs CW614N = 100%) |
| Form | Bar, rod (machined-from-solid), hot forgings |
| DZR Resistance | Inherent – Si content prevents dezincification |
| WRAS | Eligible for WRAS product approval |
| KTW W270 | Compliant (Germany) |
| RoHS | Compliant – <0.1% Pb |
| EU DWD 2020/2184 | Compliant |
| Price (Indicative) | US$ 11.50/kg (FOB India) |
Applications of CW511L Lead-Free Brass Parts
CW511L lead-free silicon brass is used for machined-from-bar lead-free brass parts: compression fitting bodies (EN 1254-1/2), olive fittings, push-fit connector bodies, valve stems and spindles, cable gland bodies for RoHS-compliant electrical installations, meter coupling bodies, thermostatic mixing valve (TMV) bodies, and HVAC valve components. In hot-forged form, CW511L produces valve bodies, gate valve wedge blanks, flange fittings, and meter housing forgings for European water works. The alloy’s dezincification resistance makes it the preferred choice for Nordic, UK, and German water utilities specifying aggressive water-quality service conditions.
International Equivalents
| Designation System | Equivalent | Standard |
|---|---|---|
| EN (Europe) – wrought | CW511L / CuZn42Si2Mn | EN 12420:2022 |
| UNS (USA) – casting | C87850 | ASTM B584, ASTM B371 |
| Trade Names | EnviroBrass, Eco Silicon Brass | Various producers |
| BS EN 17139:2020 | Lead-free copper alloy for drinking water | EU harmonized standard |
| WRAS Classification | Lead-free silicon brass | UK Water Regs 1999 |
Related Lead-Free Brass Casting Alloys
- C87850 Lead Free Brass Casting – Silicon Brass, US designation
- C89520 Lead Free Brass Casting – Bismuth-Selenium, highest machinability
- C89833 Lead Free Brass Casting – Tin-Silicon Bronze (US)
- CC499K Lead Free Brass Casting – EN 1982 European lead-free gunmetal
- Lead Free Brass Casting – All Alloys