API5CT Casing Pipe Overview

API5CT casing pipe can be divided into seamless steel pipe and welded steel pipe, welded steel pipe mainly refers to straight seam steel pipe, and large diameter oil casing is generally submerged arc welded straight seam steel pipe. The main application countries of this product are mainly distributed in the Middle East, Europe and America. API5CT oil casings can be divided into R-1, R-2 and R-3 according to their length. The main materials are B, X42, X46, X56, X65, X70 and so on. In extreme high temperature and high pressure environments, oil casing materials have their own unique natural advantages. API5CT oil casings shall be subjected to flattening test, tensile test, impact test, tensile test and other related inspection tests from raw materials to products.

What is the difference between API5CT and API5B and API5L? What are the standards for oil casing, oil pipe and line pipe?

They are similar but different tubes of the American Petroleum Institute standards.

The standard objects are:
API5CT oil casing
Processing, inspection and measurement of API5B tubing, casing and line pipe threads
API5L line pipe

The standards for oil casing, oil pipe and line pipe are as follows:
Oil casing: API5CT, GB/T19830, SY/T6194, etc.
Tubing: API5B, GB/T19830, SY/T6194, etc.
Line pipe: API5B, GB/T9711.2.2.3, SY/T5037, etc.