... Section,10x10mm-400x400mm5) Rectangle Section,20x10mm-400x200mm6) Seamless pipe: from 1in to 12in7) Galvanized pipe,pre galvanized hot rolled or hot dipped Zinc ... -coated for round,equal,rectangle steel pipe.8) Producing: Seamless,Welded,hot rolled,pre glavanized hot rolled,hot dipped ... ~ 25mm9) Standard: GB/T6728, ASTM-A5310) Using: Structural Tubing,Forniture tube,For water,Gas Severage ...