CuSn12 Bronze Casting
CuSn12 Bronze Casting is a high-tin bronze specified under ISO 1338 CuSn12, containing nominally 88% copper and 12% tin. CuSn12 is used where maximum hardness and wear resistance are required among standard ISO tin bronzes, particularly for heavy-duty worm gears and extreme-pressure bearings. Indicative price: US$ 11.00/kilogram.
CuSn12 Chemical Composition (ISO 1338)
| Element |
Min % |
Max % |
| Copper (Cu) |
rem |
— |
| Tin (Sn) |
11.0 |
13.0 |
| Phosphorus (P) |
0.01 |
0.40 |
| Lead (Pb) |
— |
0.10 |
| Zinc (Zn) |
— |
0.10 |
CuSn12 Mechanical Properties (Sand Cast – ISO 1338)
| Property |
Value |
| Tensile Strength |
280 MPa min |
| Yield Strength (0.2%) |
155 MPa min |
| Elongation |
5% min |
| Brinell Hardness |
92 HB typical |
| Density |
8.65 g/cm³ |
International Equivalents of CuSn12
| Standard |
Designation |
Common Name |
| ISO 1338 |
CuSn12 |
High Tin Bronze |
| Europe – EN 1982 |
CC492K |
CuSn11Pb2 |
| Germany – DIN |
2.1060 |
CuSn14 |
| UK – BS 1400 |
PB2 |
High Tin Phosphor Bronze |
| USA – UNS |
C91100 |
High Tin Bronze (84-16) |
| Japan – JIS H5111 |
CAC403 |
Tin Bronze |
Typical Applications
CuSn12 bronze castings are used for: heavy-duty worm gear wheels, maximum-load slow-speed bearings, bridge expansion plates, specialized wear parts in mining and steel industries, and high-pressure hydraulic pump components.
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