What Does Mortar Coated Steel Mean?
Mortar coated steel is a type of steel that has a cement-based protective coat that hardens and strengthens the steel's surface. It is typically employed for steel pipes that are buried underground for long periods.
Corrosionpedia Explains Mortar Coated Steel
Mortar coated steel has been used for many years as an efficiently protected material of choice for piping applications used to transport fluids. Its protective coat is equivalent to using a corrosion inhibitor on steel surfaces. It is however susceptible to damage due to sulfate and chloride infiltration.