name: steel pipe material: carbon steel A234 WPB ANSI B16.9 standard: ASTM, ASME, GB, JIS, ... , BS ISO9001/9002 ASTM A106/A53 Gr.B Seamless Carbon Steel Pipe OD 21.3-1220mm (1/2”-48”)WT2.11-59 ... ,BS Grade10#,20#,45#,A53,A106,A312Surface treatmentblack rust-proof oil, transparent oil, hot galvanizing, 3PE,epoxy coatingEndsplain or threaded with socket ...