Where it fits
Oil and gas gathering, transmission pipelines, station piping and high-pressure process lines where the design specifies L360/X52 PSL2.
API 5L · PSL2 · seamless
API 5L X52 PSL2 seamless line pipe
L360 / X52 is a grade-specific reference for engineering selection and RFQ preparation. HONGFENG verifies grade suffix, dimensions, connection, test requirements and documents for each order.
Updated 13 November 2026 · HEBEI HONGFENG IMPORT & EXPORT CO.,LTD
Mechanical reference
How to read L360 / X52
PSL2 seamless; normalized N or quenched-and-tempered Q suffix must be stated.
What not to assume
X52 is not freely interchangeable with ASTM A106 Grade B. API 5L is a line-pipe system requirement; the standard, design code, toughness and inspection scope must remain with the line.
Mechanical snapshotReference values; project and MTC govern
| Property | Reference |
|---|---|
| Yield strength | 360–530 MPa |
| Tensile strength range | 460–760 MPa |
| Max. Rt0.5/Rm | 0.93 |
| Delivery condition | PSL2 seamless; normalized N or quenched-and-tempered Q suffix must be stated. |
PSL2 seamless chemistry reference
| Condition | C % | Si % | Mn % | P % | S % | CEIIW | CEpcm |
|---|---|---|---|---|---|---|---|
| X52 (N / Q) | 0.24 / 0.18 | 0.45 | 1.40 / 1.50 | 0.025 | 0.015 | 0.43 | 0.25 |
The values are maximum mass fractions for seamless pipe at t ≤25 mm. Element footnotes, carbon-to-manganese adjustment, CE rules and t >20 mm agreements remain applicable.
CVN
X52 PSL2 minimum full-size Charpy energy
The applicable value depends on outside diameter and grade band. The order must also state test temperature, specimen orientation, specimen size and any HAZ requirements.
| OD mm | ≤X60 | >X60–≤X65 | >X65–≤X70 | >X70–≤X80 | >X80–≤X90 | >X90–≤X100 | >X100–≤X120 |
|---|---|---|---|---|---|---|---|
| ≤508 | 27 | 27 | 27 | 40 | 40 | 40 | 40 |
| >508–≤762 | 27 | 27 | 27 | 27 | 40 | 40 | 40 |
| >762–≤914 | 40 | 40 | 40 | 40 | 40 | 54 | 54 |
| >914–≤1219 | 40 | 40 | 40 | 40 | 40 | 54 | 68 |
| >1219–≤1422 | 40 | 54 | 54 | 54 | 54 | 68 | 81 |
| >1422–≤2134 | 40 | 54 | 68 | 68 | 81 | 95 | 108 |
X52: 27 / 27 / 40 / 40 / 40 / 40 J across the OD bands shown above.
RFQ data
What to send for X52
- Standard edition, grade and delivery suffix
- Product form and outside diameter
- Wall thickness or weight and length range
- Connection, coupling, thread or end preparation
- CVN temperature, energy or project testing
- Quantity, inspection scope, destination and date
Send the grade, dimensions and test requirements
Availability, delivery condition, test regime and documents are confirmed for the exact order. The signed contract and final MTC govern acceptance.
Related grade pages
Grade-specific technical pages
FAQ
L360 / X52
What is API 5L X52 PSL2 yield and tensile range?
For the L360/X52 pipe body, the reference range is 360–530 MPa yield and 460–760 MPa tensile, with a maximum yield-to-tensile ratio of 0.93.
Should X52 be supplied as X52N or X52Q?
The delivery-condition suffix must follow the purchase specification. This reference lists L360N/X52N and L360Q/X52Q; the suffix changes chemistry and processing and cannot be left unspecified.
What CVN value applies to X52 PSL2?
The minimum full-size CVN energy changes with outside diameter: 27 J through 762 mm and 40 J for most larger OD bands shown in the API 5L reference table. The required test temperature must also be stated.