Weight %. Balanced for hot die forging: enough β-phase for flow at forging temperature, enough Pb for clean finish machining.
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Copper | Cu | 58.0 | 61.0 | 59.5 |
| Zinc | Zn | Balance | ~38.5 | |
| Lead | Pb | 1.5 | 2.5 | 2.0 |
| Iron | Fe | — | 0.30 | 0.10 |
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength | as forged, typical | ~360 | MPa |
| Yield Strength | as forged, typical | ~140 | MPa |
| Elongation | as forged, typical | ~40 | % |
| Hot Forgeability | vs C37700 = 100 | 100 | — |
| Machinability | vs C36000 = 100 | ~80% | — |
| Density | — | 8.44 | g/cm³ |
| Melting Range | solidus–liquidus | 885–895 | °C |
| Standard | Designation |
|---|---|
| UNS / ASTM (USA) | C37700 — ASTM B283 / B124 |
| EN — equivalent | CW612N / CuZn39Pb2 |
| EN — forging cousin | CW617N / CuZn40Pb2 |
| BS (UK legacy) | CZ122 |
| Trade name | Forging Brass |
C37700 — forging brass — is the standard North American grade for hot-pressed brass die forgings per ASTM B283 (forgings) and B124 (forging rod). With 58–61% copper and 1.5–2.5% lead, it is rated 100 for hot forgeability and about 80% for machinability, so forged blanks finish-machine cleanly.
The EN equivalent is CW612N (CuZn39Pb2); the legacy British designation is CZ122. European forged fittings are also commonly made in CW617N (CuZn40Pb2), which forges equally well — confirm which grade your drawing specifies.
Forging pays off on heavy sections, large hex bodies, and asymmetric shapes where bar machining would turn most of the material into swarf. It also gives an unbroken grain flow around the part shape. Thin, long, or high-precision turned geometries usually stay cheaper machined from bar — we advise per drawing at quotation.
Yes — hot-forged brass components are supplied made to your drawing (forging through our qualified forging partners, with finish CNC machining and inspection in-house). The exact grade — C37700 or its EN equivalents — and a Type 3.1 mill certificate are confirmed at quotation.
Hot-forged blanks, finish-machined and inspected in Jamnagar. 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.