... Material of pipe:Q195,Q235,Q345 etc Our factory:Tianjin Hengji Steel Co.,Ltd greenhouse pipeO.DO.D toleranceW.TThickness Tolerance20-219mm ... 30 Days .Company info.We ,Tianjin Dingchengli International Traing.,Ltd is a professional and reputed supplier, for carbon steel ... and galvanized steel pipes.We have our own factory"Tianjin Hengji Steel Co.,Ltd" galvanized erw steel pipe for building greenhouse