Welded steel pipe welded steel blanks is optional steel or steel, welding technology is not the same because it is divided into stove pipe, welded (ERW) pipe and active arc welded pipe. Because welding is not the same as two divided Longitudinal and spiral welded pipe. Its end shape is divided into circular pipe and shaped (square, flat, etc.) pipe. Pipe material and its use is not the same and is divided into the following varieties: GB / T3091-1993 (low pressure liquid delivery galvanized welded steel pipe). Mainly used for transporting water, gas, air, oil and heating hot water or steam is typically low pressure fluid and other useful tube. Which represents raw material Q235A grade steel. GB / T3092-1993 (low pressure liquid delivery galvanized welded steel pipe). Mainly used for transporting water, gas, air, oil and heating hot water or steam is typically low pressure fluids and other useful tube. Which represents raw material: Q235A grade steel. GB / T14291-1992 (mine fluid delivery welded steel pipe). Mainly used for mine air pressure, drainage, gas discharge shaft with a straight seam welded steel pipe. Which represents raw material Q235A, grade B steel. GB / T14980-1994 (low pressure fluid delivery with a large diameter welded steel pipe). Mainly used for transporting water, sewage, gas, air, steam heating and other low pressure fluids and other uses. Which represents raw material Q235A grade steel. Galvanized square pipe hot galvanized square pipe and galvanized square tube into two categories. Galvanized square tubes have wet, dry, lead and zinc method, redox method. The main difference between the different methods of hot-dip galvanized steel pickling cleansing in the rear tube, the method used to improve the activation of galvanized pipe surface quality. Production is now mainly dry method and redox square tube steel, its characteristics are shown in Table. Galvanized zinc coating surface is very smooth and dense, uniform organization; has good mechanical properties and corrosion resistance; zinc consumption 60% to 75% lower than the hot-dip galvanizing. Galvanized technically certain complexity weight per meter square tube, but one-sided coating, different coating thickness sided coating inner and outer surfaces, and thin-walled tube galvanized mused shall use this method. Hefei square tube, square tube size, exhibition of Commerce Bo (certified merchants) are provided by the Hefei exhibition Bo Trading Company. Hefei square tube, square tube size, exhibition of Commerce Bo (certified merchants) Hefei Show Bo Trading Company (www.hfzhanbo.com) (www.hfzhanbo.com) this year introduced a new upgrade, the above picture is for reference only, please call Tel or pictures on this page, for the latest information, contact: Mr. Huang.