... cold call is made. Seamless steel pipe with a hollow cross section, a large number of channels for transporting fluids, ... so on.Product NameGradeStandardVisual and Dimensional ApplicationCasing and TubingJ55,K55,N80,L80,C90,C95,P110API SPEC 5CT,ISO1196060.23-508.00*4.24- ... gas, oil and gas wells for wellbore casing.LinepipeA,B,X42,X46,X52,X56,X60,X65,X70,X80 API SPEC 5L,GB/T9711.1,GB/T9711.232-1240 ...