... ) 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 ... GB/T6728, ASTM-A53 10) Using: Structural Tubing,Forniture tube,For water,Gas Severage composition ,100% maxCMnSiSPQ1950.06~0 ... 0.70.30.050.045 Furniture steel tube/pipe