CuSn12
CW483KHigh-tin phosphor bronze — the strongest in the CuSn series. 12% Sn for maximum wear resistance and strength among phosphor bronzes. Difficult to cold form. Primarily used as castings or hot-formed products. Used for heavy-duty bearings, worm gears, sliding surfaces, and marine hardware.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS C90800 (cast approx) | C90800 | REF |
| 🇪🇺 | EN | Europe | CuSn12 | CW483K | 100% |
Sources: ASTM B505, EN 1652
Chemical composition comparison (wt%)
Side-by-side: CuSn12 (EN) (EN 1652) vs CuSn12 (EN) (EN 1652)
| Element | CuSn12 (EN) | CuSn12 (EN) | Overlap |
|---|---|---|---|
| P | 0–0.4% | 0–0.4% | OK |
| Ni | 0–0.3% | 0–0.3% | OK |
| Cu | — | — | — |
| Sn | 11–13% | 11–13% | OK |
| Pb | 0–0.02% | 0–0.02% | OK |
| Zn | 0–0.2% | 0–0.2% | OK |
| Fe | 0–0.1% | 0–0.1% | OK |
Mechanical properties
As Cast
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 280–350 | MPa |
| Yield Strength | ≥ 150 | MPa |
| Elongation | ≥ 3 | % |
| Hardness HB | 90–130 | HB |
| Elastic Modulus | ≥ 103 | GPa |
| Density | ≥ 8.73 | g/cm3 |
Related materials
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.
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.
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