... Month Specifications 1) OD: 13-508mm2) THK: 1.2mm-120mm3) Steel grade : grade B , 20# , Q235 , ST 52 , ST374) Standards : ... :S1-6mmDeliveryconditions BK ,BKS, NBK ,BKW GBKApplicationStructure,transport gas and oil, making machine part,extCertificationISO9001-2008,API Spec 5CTPackingBundles or seaworthy ... I am looking forward to building business relationship with you. cold rolled seamless steel pipe