... 3.hot selling 4.Standard:API 5CT&ISO9001:2000 type of casing pipe thread Standard GradeChemical compositionCSiMnPSCrNiCuMoVA1sAPI SPEC5CTJ55K55(37Mn50. ... :as customers’ requestsPort:TIANJIN , SHANGHAI , AND SO ON Usage:petroleum, chemical industry, electricity, boiler, construction ,and ... so on Payment:30%T/T in advance,the balance against B/L copySection shape:roundCertification:ISO API type of casing ...