... 3)Length: 3-12m 4)Standard: ASTM, BS, EN, JIS, DIN, API, AS 5)Certificate:CE, UL, FM, ISO ... standard. Black steel pipes are used in the following fields, steel structure, build structure, transportation of low pressure liquid ... since our good quality and service. 2. Production standard: ASTM A53, BS1387, EN10255, EN10240, EN10220, EN10219, EN393. ... strips3,woven cloth with 7 slats4,as per to clients