... -dipped galvanized square steel pipe Q235,Q195,Q345 size:OD 30-500mm wall thickness:3- ... pipehot-dipped galvanized square steel pipesquare steel pipe applications:1.The product uses fine welded pipe and advanced galvanizing epuipment and technique ... resistance.2.It is widely used in the construction, pipe of industrial,water pipe, plastic-steel doors and windows, fence equipment,telecommunication ...