SQUARE STEEL TUBE 1.LENGTH: 2-12M 2.SIZE:15*15MM--1000*1000MM 3.THICKNESS:0.5-16MM 4.Q195, Q235, Q345, ECT COMPANY PROFILE Belong to TIANJIN YUANTAI DERUN PIPE GROUP, TIANJIN YUANTAI INDUSTRIAL& TRADE CO.,LTD is the leading manufacture of Pre-galvanized square tubes and hot-dip galvanzied pipes in china. we have 71 hot-diped square tubes production lines with the production capacity reach to 4, ...