galvanized steel pipe Material: Q235B, ASTM A53 Dimension:10*10-500*500mm Thickness:0.8-50mm Length:5800mm,6000mm etc. Hot dip galvanized square ... steel tubegood quality and low price1.Material: Q235B, ASTM A532 ... and pressured units,and can be used for ordinary pipeline for steam,water,gas and air.Main steel Grade: A ,B etc7 ...