... steel tube for construction O.D:21.3-219mm T.W:2.5-7.5mm certificate:ISO9001-2008 API ... steel tube for constructionO.D:21.3-219mmT.W:2.5-7.5mmcertificate:ISO9001-2008 API 5lASTM ... -7.5mm StandardASTM A 53 / BS 1387/GB/T 3091-2001Material08,10,15,20,195-Q235PackagingBundle,bulk in ... rangeliquid delivery, construction, communication, gas,etcPayment terms 30%T/T or L/C Delivery time(15-20 days)According to ...