C90300 Tin Bronze Casting
C90300 Tin Bronze Casting is a copper-tin-zinc alloy (UNS C90300) widely known as Navy G Bronze, containing nominally 88% copper, 8% tin, and 4% zinc. Electrical Accessories India manufactures C90300 sand castings, centrifugal castings, and continuous cast bars for bearings, bushings, pump components, and marine fittings. Indicative price: US$ 9.00/kilogram (subject to quantity and specification).
C90300 Chemical Composition
| Element |
Min % |
Max % |
| Copper (Cu) |
86.0 |
89.0 |
| Tin (Sn) |
7.5 |
9.0 |
| Zinc (Zn) |
3.0 |
5.0 |
| Lead (Pb) |
— |
0.30 |
| Nickel (Ni) |
— |
1.0 |
| Iron (Fe) |
— |
0.20 |
| Antimony (Sb) |
— |
0.20 |
| Phosphorus (P) |
— |
0.05 |
C90300 Mechanical Properties (Sand Cast – ASTM B584)
| Property |
Value |
| Tensile Strength |
310 MPa (45,000 psi) min |
| Yield Strength (0.5% ext.) |
152 MPa (22,000 psi) min |
| Elongation |
20% min |
| Brinell Hardness |
70 HB typical |
| Density |
8.77 g/cm³ |
| Melting Range |
854–1000°C (1570–1830°F) |
International Equivalents of C90300
| Standard |
Designation |
Nominal Composition |
| USA – UNS |
C90300 |
Cu-88, Sn-8, Zn-4 |
| USA – ASTM |
B584 Alloy 903 |
Navy G Bronze |
| UK – BS 1400 |
LG2 |
Cu-85, Sn-5, Pb-5, Zn-5 |
| Europe – EN 1982 |
CC480K |
CuSn3Zn8Pb5 |
| Germany – DIN |
2.1080 |
CuSn3ZnPb |
| ISO 1338 |
CuSn8 |
Cu-rem, Sn-8 |
| Japan – JIS H5111 |
CAC406 |
Cu-83, Sn-7, Pb-3, Zn-7 |
Casting Processes Available
- Sand Casting (ASTM B584)
- Centrifugal Casting (ASTM B271)
- Continuous Casting (ASTM B505)
- Investment Casting
Typical Applications
C90300 tin bronze castings are used for: bearings and bushings in pumps and motors, marine hardware and fittings, valve bodies and steam fittings, pump impellers and casings, gears and worm wheels, general engineering bushings, and low-pressure valves and pipe fittings.
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