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.