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By adding Cr, Zr, and other trace elements to the copper matrix, C18140 exhibits excellent electrical, mechanical, and thermal properties, as well as resistance to high-temperature softening and stress relaxation.
It is widely used in vehicle terminals, relay movable pieces, PV terminals, fuses, sockets, EV, HV battery terminals, circuit breakers, and electrical and electronic components that generate heat due to miniaturization.、
| Grade | Chemical composition（%）≤ | Thickness (mm) |
||||
| GB | ASTM | Cu | Cr | Zr | Si | |
| TCr0.3-0.15-0.03 | C18140 | Balance | 0.15-0.45 | 0.05-0.25 | 0.005-0.05 | 0.06-5.0 |
| Physical properties | ||||||
| Density (g/cm³) |
Modulus of elasticity (GPa) |
Thermal expansion coefficient (×10-6/K) |
Electrical conductivity (%IACS) |
Thermal conductivity W(m·K) |
||
| 8.9 | 135 | 18.6 | 85 | 330 | ||
| Mechanical properties | Bend properties | |||||
| Temper | Hardness HV |
Tension test | 90°R/T(Thick＜0.5mm) | |||
| Tensile Strength Rm/MPa |
Yield Strength MPa |
Elongation % |
Good way | Bad way | ||
| R460 | 120-180 | 475-575 | 430-530 | ≥8 | 0 | 1 |
| R540 | 140-200 | 525-625 | 500-600 | ≥6 | 0 | 2 |
| R580 | 160-220 | 575-725 | 530-705 | ≥4 | – | – |
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