... 12mm 3)Length: 3-12m 4)Standard: ASTM, BS, EN, JIS, DIN, API, AS 5)Certificate:CE, UL, FM, ISO ... to you various steel pipes according to international standard. Black steel pipes are used in the following ... customers since our good quality and service. 2. Production standard: ASTM A53, BS1387, EN10255, EN10240, EN10220, EN10219, EN39, ... :packed by steel strips3,woven cloth with 7 slats4,as per to clients ...