... Casing and Tubing pipe 1.Grade: J55,K55,N80,L80,P110 2.Thread: STC ... ,BTC,LTC, 3.Standard: API API seamless steel Grade J55 Casing and Tubing pipe----------------------------------------------------------------------------------------------------Specification API Casing and ... of oil casing, tubing, casing coupling, pup joint, reducer union, drill pipe coupling and also can process the special ...