... : Hengji Steel suppplying square hollow pipe :1.OD: 15*15mm-400*400mm, WT: 0 ... , ASTM, BS, JIS square pipe1.Item: Square hollow section, square pipe, square tube2.Standard: GB, ... B4.Specification: OD: 15*15mm-400*400mm, WT: 0.6mm-12mm 1. Commodity specificationsSquare hollow section2. Process methodCold ... supply of ERW pipe, seamless steel pipe, hollow section, galvanized steel coins, steel plate, stc ...