... *30mm-800*800mm WT: 3-40mm Square steel pipeSpecification: 30-800mm thickness: 3-40mm material: Q235, Q345, 20#, ST44,ST52, STKR490, ASTM ... : 30*30mm-800*800mm, Thickness: 3-40mm Length: <13m2) Material: Q235, Q345, 20#, ST37, ST44, ST52, ASTM A53, ASTM A106,STKR4903 ... so on.5) Packing: square shape bundles wrapped with strong steel strip or according to customers' requests6) Surface: oiled or black ...