Detailed Product Description Oil Casing and Tubing in Oil Wells :Standard : API 5CT, Grade: J55, K55, N80, L80, C90, C95, P110Oil Tube Size: 1.9"--4.5"Casing Size: 4.5"--20"Line Pipes used for oil and natural gas industry: Standards: API 5LGrade: A, B, X42, X46, X52, X60, X70, X80Size: 2 3/8"--70"Seamless steel tubes for high pressure chemical fertilizer processing equipment GB6479Seamless steel ...