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| Property | Value |
|---|---|
| UNS Number | C18200 |
| ASTM Standard | ASTM B646 / B647 |
| Tensile Strength | 485–620 MPa (aged) |
| Yield Strength | 410–520 MPa (aged) |
| Density | 8.9 g/cm³ |
| Max Service Temp | 350°C |
| Element | Composition (%) |
|---|---|
| Cu | ≥98.0% |
| Cr | 0.6–1.2% |
| Fe | ≤0.10% |
| Si | ≤0.10% |
| Pb | ≤0.05% |
Chromium Copper C18200 derives its high performance from a controlled addition of 0.6–1.2% chromium to a copper base. This chromium content forms fine, coherent precipitates during aging heat treatment, significantly increasing strength and hardness while retaining excellent electrical and thermal conductivity. Minor amounts of silicon or other trace elements may be present to refine grain structure and improve hot workability. Unlike many copper alloys, C18200 achieves its strength primarily through precipitation hardening rather than solid solution or work hardening alone, giving it a unique balance of mechanical and physical properties rarely found together in copper-based materials.
This precipitation-hardened structure provides fasteners with high strength, good fatigue resistance, and outstanding thermal conductivity, making them ideal for applications requiring both mechanical integrity and heat dissipation. C18200 offers good resistance to atmospheric and industrial corrosion, along with excellent resistance to softening at elevated temperatures compared to standard copper alloys. Its combination of conductivity, strength, and thermal stability makes it well suited for fasteners used in electrical, resistance welding, and high-temperature industrial equipment, where both mechanical performance and thermal or electrical efficiency are essential.
Specifications
Chromium Copper C18200 Fasteners deliver a balanced combination of strength, conductivity, and wear resistance, with specifications defined by precise dimensions, mechanical properties, and technical data suited to demanding electrical and thermal applications. Conformance to applicable material standards ensures reliable performance in critical fastening service.
| Property | Value |
|---|---|
| Tensile Strength | 350–450 MPa |
| Yield Strength | 150–250 MPa |
| Elongation | 20–35% |
| Hardness | 60–75 HRB (annealed); 90–100 HRB (aged) |
| Modulus of Elasticity | 117–124 GPa |
| Thermal Conductivity | 320–340 W/m·K |
| Coefficient of Thermal Expansion | 17.6 x10⁻⁶/°C |
| Density | 8.9 g/cm³ |
| Melting Range | 1076–1080°C |
| Heat Treatment | Solution treat + age hardening |
| Max Service Temperature | 350°C |
| Specification | Detail |
|---|---|
| Bolt Standard | ASME B18.2.1, DIN 931/933 |
| Stud Bolt Standard | ASME B18.31, DIN 976 |
| Nut Standard | ASME B18.2.2, DIN 934 |
| Washer Standard | ASME B18.22.1, DIN 125 |
| Thread Form | UNC, UNF, Metric Coarse/Fine |
| Diameter Range | M3 – M64 / #4 – 2.5 inch |
| Length Range | 10mm – 300mm (customizable) |
| Available Forms | Bolts, Studs, Screws, Nuts, Washers |
| Custom Sizes | Available on request |
| Manufacturing Standard | ISO 9001, ASTM B646 |
| Inspection Standard | ASTM E8, ASTM E18, NACE MR0175 (optional) |
Applications
