CuSn5Zn5Pb5-C (CC491K)
2.1096Classic leaded gunmetal (Rotguss Rg5) — the universal copper casting alloy for bearings and fittings. 5% Sn + 5% Zn + 5% Pb provides good machinability, moderate strength, excellent corrosion resistance in fresh and sea water, and self-lubricating properties from lead phase. Used for plain bearings under low/medium loads, valve bodies, pump housings, pipe fittings, and general marine hardware. The economic workhorse of the bronze foundry. ASTM: C83600 (SAE 40), BS: LG2.
Chemical composition comparison (wt%)
Side-by-side: CuSn5Zn5Pb5-C (CC491K) (EN) (EN 1982) vs ASTM
| Element | CuSn5Zn5Pb5-C (CC491K) (EN) | ASTM | Overlap |
|---|---|---|---|
| Si | ≤ 0.01% | — | — |
| P | ≤ 0.1% | — | — |
| Ni | ≤ 2% | — | — |
| Cu | 83–87% | — | — |
| Al | ≤ 0.01% | — | — |
| Sn | 4–6% | — | — |
| Zn | 4–6% | — | — |
| Pb | 4–6% | — | — |
| Fe | ≤ 0.3% | — | — |
Mechanical properties
As-Cast (GC)
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 200–250 | MPa |
| Yield Strength | 90–110 | MPa |
| Elongation | 6–13 | % |
| Hardness HB | 60–65 | HB |
General
| Property | Value | Unit |
|---|---|---|
| Density | ≥ 8.9 | g/cm3 |
Related materials
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2.0321Lead-free alpha/alpha+beta brass (63% Cu, 37% Zn). Compromise between cold formability (CuZn35) and hot formability (CuZn40). The most widely used unleaded brass. Used for cartridge cases, radiator cores, lamp components, plumbing fixtures, and decorative hardware.
CuZn36Pb3
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CuSn6
CW452KPhosphor bronze with 6% tin — better cold formability than CuSn8 at slightly lower strength. Excellent spring properties and fatigue resistance. Used for electrical connectors, spring contacts, switch parts, bellows, bourdon tubes, and precision springs.
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