In order to improve the corrosion resistance of steel pipes, the general steel pipes ( black pipes ) were galvanized. Galvanized steel pipes are divided into hot-dip galvanizing and electroplating zinc. The hot-dip galvanizing coating is thick and the cost of electroplating zinc is low.
Steel pipes for square pipes, rectangular pipes, cap pipes and empty rubber steel doors and windows welded by ordinary carbon structural steel and 16Mn steel strips are mainly used as agricultural machinery components and steel windows and doors.
