... : 20mm~1000mm Thickness: 2mm~100mm Length: <=14m Big size Square or rectangle steel tube with good quality and reasonable price , specifications range ... Material: Q235, Q345, 20#, ST37,ST44,ST52.,ASTM A53, ASTM A 106, STKR4903) Standards: JIS G 3466 , DIN EN 10210, DIN ... structure, shipbuilding, automotive parts and so on.5) Packing: Square shape bundles wrapped with strong steel strip or according to ...