Do you always not clear about api 5l pipe and api 5ct pipe, read this message, you will get clear about them.
一API 5L Covers Seamless and Welded Steel Line Pipe. It provide specification for pipe used in conveying gas, water, and oil in both the oil and natural gas industries.
Steel grades covered by API 5L are A25 ,A ,B (and the following "X" Grades), X42, X46, X52, X56, X60, X65, X70, X80. The two digit number following the "X" indicates the Minimum Yield Strength (in 000's psi) of pipe produced to this grade.
一API 5CT, Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries. Steel pipes for use as casing or tubing for wells.
API 5CT steel grades are namely H-40, J-55, K-55, N-80, L-80, C-90, T-95, P-110, Q-125.Steel grade H, J, K, N in the first group are of relatively low strength. Grade L, C, T represent restricted-yield casing and tubing which are normally anti-sulfur and anti-corrosive. P-110 in the third group is a high strength steel grade.Grade Q-125 is for high strength.