Fe 550D: This grade of reinforcement steel is produced to be used in reinforced concrete structures. It holds very good ductility properties that contribute to durability, giving this steel a lot of possible usage in construction works. Fe 500D (CRS): It belongs to the Fe 500 category but with CRS content. This is a CR or corrosion-resistant steel as engineered to last longer where high corrosion conditions exist in environments. It is great in the use of structures especially with moisture and corrosive factors.