... API 5CT, API 5L .GB, DIN ,JIS ,Etc Grade : J55,K55,P110,N80,L80 T95.M65.ST52.ST42 Commodites: API 5 Line Pipe or API 5CT oil ... casing pipeStandard: API 5L,API 5 CT.GB,DIN. JIS ..EctGrade : ... Used in the oil casing, natural gas .fertilizer,boiler ,power station ,ship millitary ,chemical industry ,food industry and so API 5L Line Pipe