Copper-clad steel or copper-clad steel, also known by its acronym CCS (from copper-clad steel or copper-covered steel), is a bimetallic product widely used in the cable industry that combines the high mechanical strength of steel with the conductivity and corrosion resistance of copper. Its main purpose has been to use it as drop cables for telephone wires, and as an internal conductor for coaxial cables, including thin cables such as RG174 and television cable. The main producers are located in Argentina, Brazil and the United States.

Copper clad steel is produced by metallurgical bonding of copper with a steel wire core. The CCS encompasses the benefits of copper and steel, in a product with mechanical strength and resistance to corrosion. The temperature and pressure of the process ensure a uniformly bonded and firmly adherent copper coating.

There are many applications for this product where greater strength than solid copper is required, but the corrosion resistance of copper is also preferred. Industries that benefit from this material include telecommunications, automotive, military, utilities and geophysical... Some of the various applications include grounding conductors and antistatic mats, telephone or coaxial drop wire, electronic components, radio frequency shielding, building wire, winding wire, automotive wiring harnesses, coin manufacturing, etc.