... 400*400mm 3.Grade:Q195,Q215,Q235,Q345 Square Steel PipeDimensions:15*15mm-400*400mm(1/ ... BS,GB and JIS requirements Applications:Widely used in construction structure ,machinery,container,furniture structure,electromechanical ... , airport structure ,sports apparatus and automotive partsPacking :In square bundlesO,D.(mm)W,T.(mm)O.D.(mm ... clients from all over the world in long run . black square steel tube