... & Rectangular Steel Pipe 1.round/square/rectangular 2.size:10*10*0.8-1.5~~500*500*10-25 Square & Rectangular Steel Pipe Square & Rectangular ... #.45#,A53,A106,A178,A315Q345,16Mn,Q390,ST52-3TechniqueHot rolled and cold drawn,ERWApplicationPetroleum,chemical,power,metallury ,shipbuilding,construction.Surface 1 ...