C85400 copper sheet is a high-performance cast tin bronze sheet renowned for its exceptional machinability and wear resistance. It contains approximately 5% tin, 5% zinc, and 5% lead. The lead particles act as lubricants and chip breakers during machining, significantly improving machining efficiency, extending tool life, and producing a smooth, finished surface. This is why it’s commonly known as “free-cutting brass.”
In addition, the tin in this alloy imparts high strength, hardness, and excellent corrosion resistance, enabling parts made from it to withstand high loads and severe friction and wear. Consequently, C85400 copper sheet is often used in the manufacture of critical components such as high-load gears, wear-resistant bushings, and pump and valve components in heavy machinery. It plays a vital role in industrial applications requiring complex shapes, wear resistance, durability, and efficient production.
| Property (& Unit) | Value | Condition / Note |
|---|---|---|
| Tensile Strength (MPa) | 480 – 550 | As Cast |
| Yield Strength (0.5% Ext) (MPa) | 170 – 220 | As Cast |
| Elongation (% in 2″) | 15 – 25 | As Cast |
| Hardness (Brinell) | 85 – 100 HB | As Cast |
| Modulus of Elasticity (GPa) | 96 | In Tension |
| Shear Modulus (GPa) | 36 | |
| Fatigue Strength (MPa) | ~ 125 |
