CuZn37
2.0321Lead-free alpha/alpha+beta brass (63% Cu, 37% Zn). Compromise between cold formability (CuZn35) and hot formability (CuZn40). The most widely used unleaded brass. Used for cartridge cases, radiator cores, lamp components, plumbing fixtures, and decorative hardware.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | C27200 | C27200 | REF |
| 🇪🇺 | EN | Europe | CuZn37 / CW508L | 2.0321 | 100% |
| 🇯🇵 | JIS | Japan | C2720 | — | 95% |
| 🇬🇧 | BS | United Kingdom | CZ107 (old) | — | 95% |
Sources: ASTM B36, EN 12167, JIS H3100, BS 2870
Chemical composition comparison (wt%)
Side-by-side: CuZn37 (EN) (EN 12167) vs C2720 (JIS)
| Element | CuZn37 (EN) | C2720 (JIS) | Overlap |
|---|---|---|---|
| Ni | 0–0.3% | — | — |
| Cu | 62–64% | — | — |
| Al | 0–0.05% | — | — |
| Fe | 0–0.1% | — | — |
| Pb | 0–0.1% | — | — |
| Sn | 0–0.1% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 310–400 | MPa |
| Yield Strength | ≥ 100 | MPa |
| Elongation | ≥ 38 | % |
| Elastic Modulus | ≥ 100 | GPa |
| Density | ≥ 8.44 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| annealing | 425–650 °C | air | 1-2 hours | Stress relief at 250-300°C. Full anneal at higher temps. |
Compatibility verdict
CuZn37 and C2720: 95% composition match
Close equivalents but NOT identical.
Related materials
CuZn36Pb3
CW603NFree-cutting leaded brass — the benchmark for non-ferrous machinability (rated 100%). Lead particles act as chip breakers for excellent surface finish. Used for screw machine parts, fittings, valves, watch components, precision mechanics, and electrical connectors. Old DIN number 2.0375.
CuSn6
CW452KPhosphor bronze with 6% tin — better cold formability than CuSn8 at slightly lower strength. Excellent spring properties and fatigue resistance. Used for electrical connectors, spring contacts, switch parts, bellows, bourdon tubes, and precision springs.
CuAl9Ni3Fe2
CC331GStandard aluminum bronze casting alloy — 9% Al, lower Ni (3%) and Fe (2%) than CuAl10Ni5Fe4 (NAB). Good strength and corrosion resistance at lower cost than NAB. Used for valve bodies, pump casings, bearing bushings, and marine fittings where NAB-level performance is not required. UNS C95400 equivalent.
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