Which material is commonly used for guy wires?

Steel is commonly used for guy wires primarily due to its remarkable strength and durability. Guy wires are tensioned cables that provide stability and support to towers, particularly tall structures like communication towers. The tensile strength of steel allows it to withstand significant loads and resist bending or breaking under tension, making it an ideal choice for this application.

Additionally, steel is resistant to environmental factors such as wind and weather conditions, which is crucial for maintaining the integrity of the tower structure over time. While other materials, such as aluminum and copper, possess certain benefits, they do not match the performance of steel in terms of tensile strength and overall robustness required for guy wires. Plastic is not suitable for this purpose at all, as it lacks the necessary strength and durability to support the loads involved.