Mass %, Copper Development Association. Copper plus the named elements must total at least 99.5 %. The composition is specified as limits; the mill certificate gives the analysis of each heat.
| Element | Symbol | Min % | Max % |
|---|---|---|---|
| Copper | Cu | 55.0 | 60.0 |
| Lead | Pb | 1.5 | 2.5 |
| Tin | Sn | — | 0.30 |
| Iron | Fe | — | 0.35 |
| Aluminium | Al | — | 0.50 |
| Zinc | Zn | Balance | |
Requirements for extruded rod and shapes are set in ASTM B455, and the mill certificate reports the values of the supplied lot. Material certified to both C38000 and CW617N can also be judged against the EN values on the CW617N datasheet.
| Standard | Designation |
|---|---|
| UNS / ASTM (USA) | C38000 — ASTM B455 (extruded rod and shapes) |
| EN — equivalent | CW617N / CuZn40Pb2 (Cu 57–59, Pb 1.6–2.2) — also in ASTM B455-26 |
| BS (UK legacy) | CZ122 — the old British name of CW617N |
| UNS — related forging grade | C37700 forging brass (Cu 58–61, Pb 1.5–2.5) |
| UNS — higher-lead sibling | C38500 (Pb 2.5–3.5) — also in ASTM B455 |
| JIS (Japan) — overlapping | C3771 forging brass (Cu 57–61, Pb 1.0–2.5) |
C38000 is the low-leaded architectural bronze of the UNS system: 55.0–60.0 % copper, 1.5–2.5 % lead, tin up to 0.30 %, iron up to 0.35 %, aluminium up to 0.50 %, balance zinc. It is supplied as extruded rod and architectural shapes to ASTM B455; typical uses are architectural sections, door and window frames, thresholds, hinges and builders hardware.
They are equivalents. CW617N (CuZn40Pb2) allows 57–59 % copper, 1.6–2.2 % lead, and up to 0.3 % tin, 0.3 % iron and 0.05 % aluminium — all inside the C38000 limits. The reverse is not automatic: a C38000 heat with 56 % copper, or with 0.3 % aluminium, is not CW617N. Since its 2026 edition, ASTM B455 lists C38000, C38500, CW614N and CW617N in one specification.
Both are ASTM B455 extrusion alloys. C38000 has 1.5–2.5 % lead and allows up to 0.50 % aluminium and 0.30 % tin; C38500 has 2.5–3.5 % lead and names only iron besides copper, lead and zinc. The EN equivalent of C38000 is CW617N; that of C38500 is CW614N.
Requirements for extruded rod and shapes are set in ASTM B455, and the mill certificate reports the values of the supplied lot. Material certified to both C38000 and CW617N can be judged against the EN values on the CW617N datasheet.
For RoHS, its 1.5–2.5 % lead is covered by Annex III exemption 6(c), which allows up to 4 % lead in copper alloys and is currently valid to 30 June 2027. For drinking-water contact it is not suitable: NSF/ANSI 372 limits the weighted lead content of wetted surfaces to 0.25 %. Lead-free options on this site include the silicon brass C69300 / CW724R and the bismuth brass C6802.
Yes — made to your drawing, turned, or hot-forged through our qualified forging partners and finish-machined in-house. Whether stock certified to C38000 is available for your quantity is confirmed at quotation; if your drawing allows it, we can quote CW617N, whose limits lie inside C38000, and show both analyses side by side. Series lead time is 3–5 weeks from the approved drawing, forged first articles 8–10 weeks.
C38000, ASTM B455 for extruded rod or shapes. The EN equivalent is CW617N (EN 12164 / EN 12165); the 2026 edition of ASTM B455 lists both.Primary source: ASTM B455/B455M — Copper-zinc-lead alloy (leaded-brass) extruded shapes.
Turned or forged, finish-machined and inspected in Jamnagar. ISO 9001:2015. Quote within 24 hours.
Request a QuoteComposition limits and typical uses are taken from the Copper Development Association datasheet; the product scope from ASTM B455. For procurement specification, always reference the current published edition of the standard.
Last reviewed: September 2026. Composition limits, typical values and fabrication ratings are those published by the Copper Development Association; product scopes are from the ASTM editions listed above. Typical values are not specification limits. For safety-critical or contract-critical applications, 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 C38000 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.