... China including Steel pipes, square steelpipes, rectangular steel pipes, galvanized steel, galvanized square,rectangular tubes, spiral steel ... buildingmaterials, fence, heating facilities etc. hot galvanized square and rectangular tube High-frequency welded ERW galvanized steel ... 400mmWall thickness0.8mm-13.5mmLengthMax.14meters.by customer's requiremntsStandardBS,GB ,DIN,ASTM,JIS,Steel GradeQ195/Q215 ...