Where it fits
High-pressure oil and gas transmission, offshore-adjacent or project lines requiring higher strength with controlled toughness and dimensional verification.
API 5L · PSL2 · seamless
API 5L X65 PSL2 seamless line pipe
L450 / X65 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 L450 / X65
PSL2 seamless X65Q is the referenced quenched-and-tempered condition; confirm the exact suffix and project testing.
What not to assume
X65 is a specific PSL2 grade, not a generic upgrade to X60. Higher strength changes welding, fracture-control and inspection requirements, and should not be substituted without design approval.
Mechanical snapshotReference values; project and MTC govern
| Property | Reference |
|---|---|
| Yield strength | 450–600 MPa |
| Tensile strength range | 535–760 MPa |
| Max. Rt0.5/Rm | 0.93 |
| Delivery condition | PSL2 seamless X65Q is the referenced quenched-and-tempered condition; confirm the exact suffix and project testing. |
PSL2 seamless chemistry reference
| Condition | C % | Si % | Mn % | P % | S % | CEIIW | CEpcm |
|---|---|---|---|---|---|---|---|
| X65 (Q) | 0.18 | 0.45 | 1.70 | 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
X65 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 |
X65: 27 / 27 / 40 / 40 / 54 / 54 J across the OD bands shown above.
RFQ data
What to send for X65
- 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
L450 / X65
What is the yield strength of API 5L X65 PSL2?
L450/X65 has a specified pipe-body yield range of 450–600 MPa, tensile 535–760 MPa and maximum yield-to-tensile ratio 0.93.
What Charpy energy applies to X65 PSL2?
The full-size minimum is 27 J up to 762 mm outside diameter, 40 J from above 762 to 1219 mm and 54 J for larger OD bands shown in the API 5L table.
Can X65Q be used without impact testing?
No final claim should be made from the grade alone. PSL2 CVN requirements, test temperature, specimen size and any project supplementary requirements must be stated and verified on the MTC.