Rectangular Hollow Section Steel Tube Size: OD: 20mm*10mm ~ 400mm*300mm Pipe Standard:ASTM A53, ASTM A500,BS EN 10219,JIS G 3466, ASTM A513, ASTM A36;S235JR,S355JR,Q235,St37,St37-2,St52,SS400, STK500, Furface:Black bared ,can be galvanized,oiled,painted,powdered. Packing:Waterproof plastic bag,bundle with strip Application:Widely used in