LG4 Bronze Alloy Casting
LG4 Bronze Alloy Casting is a high-strength leaded gunmetal specified under BS 1400 LG4, containing nominally 86% copper, 8% tin, 4% lead, and 2% zinc. LG4 offers higher tin content than LG2, giving improved strength and hardness for more demanding bearing and structural casting applications. Indicative price: US$ 9.20/kilogram.
LG4 Chemical Composition (BS 1400)
| Element |
Min % |
Max % |
| Copper (Cu) |
84.0 |
88.0 |
| Tin (Sn) |
7.0 |
9.0 |
| Lead (Pb) |
3.0 |
5.0 |
| Zinc (Zn) |
1.0 |
3.0 |
| Nickel (Ni) |
— |
2.0 |
| Iron (Fe) |
— |
0.20 |
LG4 Mechanical Properties (Sand Cast – BS 1400)
| Property |
Value |
| Tensile Strength |
295 MPa min |
| Yield Strength |
140 MPa min |
| Elongation |
15% min |
| Brinell Hardness |
75 HB typical |
| Density |
8.77 g/cm³ |
International Equivalents of LG4 Bronze
| Standard |
Designation |
Common Name |
| UK – BS 1400 |
LG4 |
Leaded Gunmetal |
| USA – UNS |
C90500 |
Gun Metal |
| Europe – EN 1982 |
CC483K |
CuSn7Zn4Pb6 |
| Germany – DIN |
2.1093 |
CuSn7ZnPb |
| ISO 1338 |
CuSn8 |
Tin Bronze |
| Japan – JIS H5111 |
CAC407 |
Tin Bronze |
Typical Applications
LG4 bronze alloy castings are used for: high-strength bearings and bushings, marine propeller fittings, pump casings and impellers, valve bodies for high-pressure service, structural castings, and bridge bearings.
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