Characteristic
Tough and hard material with very high wear resistance, also suitable at high sliding speeds
and surface pressures. Good corrosion resistance, seawater-resistant, resistant to cavitation
stress, medium machinability. High-speed worm and helical wheel rims.
| Common name | Material description | World specifications: European | World specifications: British | World specifications: American |
| Tin bronze | CuSn12-C / CuSn12-B | CC484K / CC484K (EN 1982) | CT2 (BS 1400) | C91700 (ASTM B 427) |
Other name: JIS CIn2, ASTM C92500, SEA 640, CDA 925, GC-CuSn12Ni.
The equivalence between the standards is not absolute and some variations in composition can exist.
Similar or Equivalent Specifications
| UNS | ASTM | SAE | AMS | Federal | Military | Other |
| C91700 | B427 |
Chemical Composition
| Cu | Sn | Pb | Zn | Ni | Al | Fe | Mn | P | S | Si | Sb | |
| Min | 84.5 | 11.0 | – | – | 1.5 | – | – | – | 0.05 | – | – | – |
| Max | 87.5 | 13.0 | 0.3 | 0.4 | 2.5 | 0.01 | 0.2 | 0.2 | 0.4 | 0.05 | 0.01 | 0.1 |
Mechanical Properties
| Rm | Tensile strength min. | 300 N/mm2 |
| Rp0.2 | Proof Strength min. | 180 N/mm2 |
| A(50mm) | Elongation min. | 10% |
| HB | Brinell hardness min. | 95 HBW |
Properties:
- construction material with very good wear resistance;
- corrosion and sea water resistant.
Application:
- annular and tubular construction elements;
- nuts moved under load;
- high stress high- speed warm and helical wheel rims;
- automotive synchronizer rings.