... '' 2)WT: 0.8mm-12mm 3)Length: 3-12m 4)Standard: ASTM, BS, EN, JIS, DIN, API, AS 5)Certificate:CE ... and supply to you various steel pipes according to international standard. Black steel pipes are used in the following fields, steel structure ... many customers since our good quality and service. 2. Production standard: ASTM A53, BS1387, EN10255, EN10240, EN10220, EN10219, EN39, JIS3. Section ...