... 5L1,5L2, API 5CT, GBT/ 9711.1 GBT/9711.2 EN10217,EN10219 1.Commodity NameERW carbon steel pipe / line ... , API 5L1,5L2, API 5CT, GBT/ 9711.1 GBT/9711.2 EN10217,EN102193.Outer Diameter21.3-457. ... , Belgium, etc13.CertificatesAPI 5L PSL1,PSL2 , API 5CT, ISO ,CE1.Commodity NameERW carbon steel pipe / line pipe2.Standard, ... , API 5L1,5L2, API 5CT, GBT/ 9711.1 GBT/9711.2 EN10217,EN102193.Outer Diameter21.3-457. ...