Weight %. The tin addition stabilises the alloy against corrosion and erosion in saline and brackish water; no lead is added.
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Copper | Cu | 59.0 | 62.0 | 60.0 |
| Zinc | Zn | Balance | ~39.2 | |
| Tin | Sn | 0.50 | 1.0 | 0.8 |
| Lead (max) | Pb | — | 0.20 | ≤0.10 |
| Iron | Fe | — | 0.10 | 0.05 |
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength | soft → hard | 380–605 | MPa |
| Yield Strength | soft → hard | 170–455 | MPa |
| Elongation | by temper | 17–45 | % |
| Machinability | vs C36000 = 100 | ~30% | — |
| Hot Forgeability | vs C37700 = 100 | 90 | — |
| Density | — | 8.41 | g/cm³ |
| Melting Range | solidus–liquidus | 885–900 | °C |
| Standard | Designation |
|---|---|
| UNS / ASTM (USA) | C46400 — ASTM B21 |
| EN — equivalent | CW719R / CuZn39Sn1 |
| ISO | CuZn39Sn1 |
| Related grade | CuZn40 — Muntz metal (no Sn) |
| Trade name | Naval Brass (uninhibited) |
C46400 is the standard naval brass per ASTM B21 — roughly 60% copper, 39% zinc, and 0.5–1.0% tin. The tin addition gives it corrosion and erosion resistance in seawater, and it is strong (tensile to ~605 MPa hard), galling-resistant, and hot-forgeable. There is no lead addition.
The EN equivalent is CW719R (CuZn39Sn1), which is also the ISO designation. The same metallurgy serves drawings written to either system; we confirm the certificate wording at quotation.
Usually — there is no lead addition and typical heats run well under 0.10% Pb, but the ASTM B21 limit allows up to 0.20% max, which exceeds the RoHS threshold on paper. For RoHS-critical orders we verify the actual Pb content on the Type 3.1 mill certificate before production.
Plan for ~30% of the free-cutting benchmark: lower speeds, positive sharp tooling, and stringier chips than leaded brass. It machines predictably but slowly — heavy sections are often cheaper hot-forged first and finish-machined. Send your drawing for a quote within 24 hours.
Naval brass marine components, forged and 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.
Brassland machines C46400 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.