CAC406 Bronze Casting
CAC406 Bronze Casting is a gunmetal (leaded tin-zinc bronze) specified under JIS H 5111 CAC406 (formerly BC6), containing nominally 83% copper, 7% tin, 3% lead, and 7% zinc — the Japanese equivalent of the internationally popular leaded gunmetal. It combines good castability, pressure tightness, strength, and machinability. Indicative price: US$ 8.80/kilogram.
CAC406 Chemical Composition (JIS H 5111)
| Element |
Min % |
Max % |
| Copper (Cu) |
rem |
— |
| Tin (Sn) |
6.0 |
8.0 |
| Zinc (Zn) |
5.0 |
8.0 |
| Lead (Pb) |
2.0 |
5.0 |
| Nickel (Ni) |
— |
2.0 |
| Iron (Fe) |
— |
0.30 |
CAC406 Mechanical Properties (Sand Cast – JIS H 5111)
| Property |
Value |
| Tensile Strength |
245 MPa min |
| Yield Strength (0.2%) |
95 MPa min |
| Elongation |
15% min |
| Brinell Hardness |
65 HB typical |
| Density |
8.85 g/cm³ |
International Equivalents of CAC406
| Standard |
Designation |
Common Name |
| Japan – JIS H5111 |
CAC406 (formerly BC6) |
Gunmetal |
| ISO 1338 |
CuSn6Zn6Pb3 |
Leaded Gunmetal |
| Europe – EN 1982 |
CC482K |
CuSn7Zn2Pb3 |
| Germany – DIN |
2.1090 |
CuSn7ZnPb |
| UK – BS 1400 |
LG2 |
Ounce Metal |
| USA – UNS |
C92200 / C93200 |
Steam Bronze / Bearing Bronze |
Typical Applications
CAC406 gunmetal castings are used for: general engineering valve bodies, pump bodies and impellers, water and steam pipe fittings, marine hardware, bearing housings, pipe flanges, and general industrial castings for Japanese and international markets.
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