Where it fits
High-strength transmission lines and project piping where the engineering design specifically requires L485/X70 and a controlled PSL2 test regime.
API 5L · PSL2 · seamless
API 5L X70 PSL2 seamless line pipe
L485 / X70 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 L485 / X70
PSL2 seamless X70Q is the referenced quenched-and-tempered condition; welding and toughness procedure must be project-specific.
What not to assume
X70 is not the same as API 5L X70M welded product. For seamless pipe, X70Q is the referenced condition; the M suffix belongs to thermomechanically rolled welded pipe.
Mechanical snapshotReference values; project and MTC govern
| Property | Reference |
|---|---|
| Yield strength | 485–635 MPa |
| Tensile strength range | 570–760 MPa |
| Max. Rt0.5/Rm | 0.93 |
| Delivery condition | PSL2 seamless X70Q is the referenced quenched-and-tempered condition; welding and toughness procedure must be project-specific. |
PSL2 seamless chemistry reference
| Condition | C % | Si % | Mn % | P % | S % | CEIIW | CEpcm |
|---|---|---|---|---|---|---|---|
| X70 (Q) | 0.18 | 0.45 | 1.80 | 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
X70 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 |
X70: 27 / 27 / 40 / 40 / 54 / 68 J across the OD bands shown above.
RFQ data
What to send for X70
- 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
L485 / X70
What is API 5L X70 PSL2 tensile strength?
L485/X70 has a reference yield range of 485–635 MPa and tensile range of 570–760 MPa, with maximum yield-to-tensile ratio 0.93.
Is API 5L X70M suitable for seamless pipe?
M identifies thermomechanically rolled welded product in the referenced API 5L data. It should not be presented as a seamless delivery condition; verify X70Q or the exact project suffix.
Which X70 CVN row applies to large pipe?
For X70 PSL2, the reference minimum reaches 54 J above 1219 mm OD and 68 J above 1422 mm OD, while smaller sizes can be lower. The project temperature and supplementary requirements remain mandatory.