1)O.D: 1/2''-12'' 2)WT: 0.8mm-12mm 3)Length: 3-12m 4)Standard: ASTM, BS, EN, JIS, DIN, API, AS 5)Certificate:CE, UL, FM, 1. Brief Introduction:We can produce and supply to you various steel pipes according to international standard. Black steel pipes are used in the following fields, steel structure, build structure, transportation of low pressure liquid and gas etc. Our products are exported to ...