... 15mm-400*400mmWall thickness0.45mm-12mm(welded); 2mm-30mm(seamless)Steel GradeQ195-Q345, st37-2, SS400, ASTM.A53, 20#, ... you request.DETAIL PRODUCT DESCRIPTION: black square pipe/carbon steel tube/welded pipe NAME OF PRODUCTSquare tube,Rectangular tube ... days after deposit Other productsWelded steel pipe,square/rectangular hollow section,seamless steel pipe, steel strip, steel coil, square bar,flat bar ...