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Silicon bronze is a high-strength copper alloy containing silicon and small amounts of other alloying elements to enhance its mechanical properties and corrosion resistance. Known for its excellent resistance to seawater, chemicals, and atmospheric corrosion, silicon bronze is widely used in marine, architectural, electrical, and industrial applications. The alloy offers good wear resistance, low friction characteristics, excellent formability, and superior weldability. Silicon bronze components are commonly used in fasteners, marine hardware, bearings, bushings, valve stems, pump components, electrical connectors, and decorative architectural fittings where durability and corrosion resistance are critical.
| ISO Symbols | UNS | EN | BS | JIS | IS |
|---|---|---|---|---|---|
| CuSi3Mn1 | C65500 | CW111C | SB4 | C6551 | - |
| CuSi2Mn | C65100 | CW111A | - | C6511 | - |
| CuSi1.5Mn | C65200 | CW111B | - | C6521 | - |
| CuSi4Zn9Mn | C66100 | - | - | - | - |
| CuSi3Zn3Mn | C66200 | - | - | - | - |
| CuSi3Zn1 | C66300 | - | - | - | - |
| CuSi2.5Zn2Mn | C66400 | - | - | - | - |
| CuSi3 | C87300 | CC480K | LG2 Equivalent | - | - |
| CuSi4 | C87400 | CC481K | - | - | - |
| CuSi5Zn5Mn | C87500 | CC483K | - | - | - |
| CuSi6Zn6Mn | C87600 | CC484K | - | - | - |
| CuSi2Mn1 | C87850 | CC491K | - | - | - |
