The main difference between API 5L X52 and ISO 3183 L360 is their standard sources and yield strength expression methods.
Both API 5L X52 and ISO 3183 L360 are used to indicate the steel grade of pipeline steel pipe, but they belong to different standard systems. API 5L is the standard of the American Petroleum Institute, while ISO 3183 is the standard of the International Organization for Standardization (ISO). API 5L X52 and ISO 3183 L360 differ in the steel grade expression: API 5L X52: In the API 5L standard, the steel grade is indicated by "X" followed by a number, such as X52, which means the minimum yield strength is 52,000 psi (about 355 MPa). ISO 3183 L360: In the ISO 3183 standard, the steel grade is indicated by "L" followed by a number, such as L360, which means the minimum yield strength is 360 MPa.
In addition, API 5L and ISO 3183 also differ in standard content and scope of application:
API 5L: Applicable to pipeline steel pipes used in the oil and gas industry, including seamless steel pipes and welded steel pipes, suitable for onshore and submarine pipelines.
ISO 3183: Also applicable to pipeline steel pipes used in the oil and gas industry, but mainly used for pipeline steel pipes in offshore and sour environments.
API 5L X52 large diameter steel piping
