hollow rectangular steel iron tube manufacture price Q195-Q235,20#,45#,A53 etc. Size:20x20-400x400mm. TCT:0.3-12.0mm hollow rectangular steel iron ... tubeO.DW.T50*70---400*600mm1.5---25mmMaterialQ195,Q215, Q235,Q345, A53 (A,B)TechniqueHot rolled,cold rolled,cold ... )Package: In bundles or according to customers' requirements hollow rectangular steel iron tube