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CuSn6Zn6Pb3 Bronze Casting
CuSn6Zn6Pb3 Bronze Casting is a leaded tin-zinc bronze specified under ISO 1338, containing nominally 85% copper, 6% tin, 6% zinc, and 3% lead. This alloy is widely used as the ISO basis for general-purpose leaded gunmetal castings, offering a good balance of strength, castability, machinability, and corrosion resistance. Indicative price: US$ 8.60/kilogram.
CuSn6Zn6Pb3 Chemical Composition (ISO 1338)
| Element | Min % | Max % |
|---|---|---|
| Copper (Cu) | rem | — |
| Tin (Sn) | 5.0 | 7.0 |
| Zinc (Zn) | 4.0 | 7.0 |
| Lead (Pb) | 2.0 | 4.0 |
| Nickel (Ni) | — | 2.0 |
| Iron (Fe) | — | 0.30 |
CuSn6Zn6Pb3 Mechanical Properties (Sand Cast – ISO 1338)
| Property | Value |
|---|---|
| Tensile Strength | 250 MPa min |
| Yield Strength (0.2%) | 110 MPa min |
| Elongation | 14% min |
| Brinell Hardness | 65 HB typical |
| Density | 8.83 g/cm³ |
International Equivalents of CuSn6Zn6Pb3
| Standard | Designation | Common Name |
|---|---|---|
| ISO 1338 | CuSn6Zn6Pb3 | Leaded Gunmetal |
| Europe – EN 1982 | CC481K | CuSn5Zn5Pb5 |
| UK – BS 1400 | LG2 | Ounce Metal |
| USA – UNS | C83600 | Ounce Metal / Red Brass |
| Germany – DIN | 2.1096 | CuSn5ZnPb |
| Japan – JIS H5111 | CAC406 | Gunmetal |
Typical Applications
CuSn6Zn6Pb3 bronze castings are used for: general engineering valve bodies and fittings, pump casings, marine hardware, water and steam pipe fittings, bearing housings, and low-pressure hydraulic components.