In GI Tubes, GI Means “galvanized iron.” Thus, GI Tubes and pipes are galvanized iron pipes or called coated iron Tubes and pipes in old terminology.
GI carbon steel tubes and GI pipes are immersed in a galvanic (zinc) bath. GI (Galvanized Iron) Pipes and tubes are classified into 3 grades based on their weight per meter and inner diameter thickness.
The more thickness means the better performance and Long durability. According to the IS 1239, each pipes and Tubes shall bear a color strip across the circumference for identifying the “class” of the GI pipes. These pipes are cheaper, of lightweight and easy to handle.