C18000 is an RWMA Class 3 copper alloy with high tensile strength, high wear resistance, good electrical conductivity, and good thermal conductivity. Its properties are very similar to those of C17510, except it’s beryllium-free. C18000 contains 1.8-3.0% nickel, 0.1-0.8% chromium, and 0.4-0.08% silicon.
This copper alloy meets the requirements of the AWS J1.3 standard, making it a particularly good choice for welding stainless steel and nickel alloys. C18000 copper can be machined at lower speeds and feeds than free-cutting mild steel, and its moderate corrosion resistance means it can be used in many industrial settings without a coating.
This grade is widely used in applications requiring strength and thermal conductivity, and where electrical conductivity is beneficial.
| Property | Value | Notes |
|---|---|---|
| Material Type | Copper nickel silicon chromium alloy | UNS C18000, beryllium-free |
| Density | 0.316 lb/in3 | |
| Melting Point | ~1,020-1,040 °C | ~1,868-1,904 °F |
| Hardness (Brinell) | ~180-185 | |
| Tensile Strength | ~586 MPa | ~85,000 psi |
| Yield Strength | ~483 MPa | ~70,100 psi |
| Elongation at Break | ~10% | |
| Modulus of Elasticity | ~114 GPa | ~16.5x106 psi |
| Corrosion Resistance | Moderate | Inferior to 316 stainless, but will resist atmospheric corrosion |
| Magnetism | Non-magnetic | |
| Heat Treatment | Yes; can be precipitation hardened | |
| Machinability | Poor in comparison to 1012 steel, but can be machined at low speeds | |
| Weldability | Good |
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