galvanized square steel pipe 1.Thickness:0.6 - 10 mm 2.Size:15*15-400*400mm 3.Grade:Q195,Q215,Q235,Q345 Square Steel ... ASTM,DIN,BS,GB and JIS requirements Applications:Widely used in construction structure ,machinery,container,furniture structure,electromechanical hardware,door ... ,hall structure, airport structure ,sports apparatus and automotive partsPacking :In square bundlesO,D.(mm)W,T.(mm)O.D.(mm)W ...