3 inch galvanized pipe or 100 square pipe. According to the material specifications and process requirements of the color steel shed, it can be seen that the color steel shed is 7 meters high and the column needs 3-inch galvanized pipe or 100 square pipe. Caigang shed is a new concept of environmental protection and economical house, with light steel H-beam and channel steel as skeleton, sandwich panel as wallboard material, standard module series, bolts or welded components in space combination.