API 5L 7 Unprimed internal fusion bonded epoxy coating of line pipe Standard: ASTM,JIS,EN,ISO,BS,GOST ... API 5L 7 Unprimed internal fusion bonded epoxy coating of line pipe ASTM A519 50B40 50B44 50B46 50B50 50B60 ... STKM19A, STKM19C,STKM20AJIS G3454 STPG 38, STPG 42JIS G3455 STS 38, STS 42, STS 49JIS G3456 STPT 38, STPT 42, STPT 49JIS ... API 5L 7 Unprimed internal fusion bonded epoxy coating of line pipe