Which material for pipes is most susceptible to damage from corrosion?

Steel is considered the material most susceptible to damage from corrosion among the options provided. This vulnerability is due to steel's iron content, which reacts with moisture and oxygen in the environment. When exposed to these elements, steel can develop rust, a process that deteriorates the integrity of the pipe over time. Factors such as the environment—particularly soil composition and the presence of electrolytes—can accelerate this corrosion process.

In contrast, plastic and PVC pipes are highly resistant to corrosion because they do not contain metal components that oxidize. Copper is also more resistant to corrosion than steel as it forms a protective patina (copper oxide) when exposed to the elements. However, it can still corrode under certain conditions, especially in acidic soils, but its susceptibility is significantly lower compared to steel. Hence, for durability in corrosive environments, materials like plastic and PVC are preferred, leaving steel at a higher risk for damage.