... x42 1.Suitable for conveyance of gas, petroleum, liquid, and electricity; 2. OD: 21.3-457.2mm api 5l line pipe x421 ... carbon steel pipe / line pipe2.Standard,ASTMA252, ASTM A53, API 5L1,5L2, API 5CT, GBT/ 9711.1 GBT/9711.2 EN10217,EN102193 ... , Spain, Italy, France, England, Belgium, etc13.CertificatesAPI 5L PSL1,PSL2 , API 5CT, ISO ,CE