... 15*15-400*400mm 3.Grade:Q195,Q215,Q235,Q345 Square Steel PipeDimensions:15*15mm-400*400mm(1/2''*1/ ... and JIS requirements Applications:Widely used in construction structure ,machinery,container,furniture structure,electromechanical hardware,door and guardrail,plaza structure , ... hall structure, airport structure ,sports apparatus and automotive partsPacking :In square bundlesO,D.(mm)W,T.(mm)O.D.(mm)W ...