According to the correspondence between API 5L and different national standards, the equivalent materials of API 5L X52N are as follows:
1. Chinese national standard (GB/T 9711)
L360N:
Characteristics of steel grade: It matches the mechanical properties (e.g. yield strength, tensile strength) and chemical composition of X52N, and is suitable for oil and gas pipeline projects.
Process requirements: 'L' in the national standard stands for pipeline steel, 'N' indicates the normalised heat treatment state, which is consistent with the process requirements of API 5L X52N. 2. Correspondence in other international standards
2. Correspondence in other international standards
ISO 3183:
L360N: In the pipe line steel standard of International Organisation for Standardisation (ISO), the chemical composition, mechanical properties and applications of L360N and API 5L X52N are the same.
Comparison of key parameters
| Standard | material | yield strength(MPa) | tensile strength(MPa) | heat treatment state |
|---|---|---|---|---|
| API 5L | X52N | 360–530 | 460–760 | normalizing (N) |
| GB/T 9711 | L360N | ≥360 | ≥460 | normalizing (N) |
