In order to improve the corrosion resistance of the steel pipe, the general steel pipe is galvanized. Galvanized steel pipe is divided into hot galvanizing and galvanizing, hot galvanized layer thick, galvanizing cost is low, the surface is not very smooth. Oxygen blowing welding pipe: used as steel oxygen blowing pipe, generally with small diameter welded steel pipe, specifications from 3 / 8-2 inches eight. Made of the steel strip of 08,10,15,20 or 195-Q235, in order to prevent corrosion, some should be effectively infiltrated with aluminum treatment.