X52 / L360 | PSL1 & PSL2 | API SPEC 5L, 47TH EDITION (2026)
HIGHER-STRENGTH PIPELINE MATERIAL / X52 - L360
Source API 5L X52 / L360 steel line pipe for energy and industrial transmission projects. Specify PSL, delivery condition, manufacturing route, outside diameter, wall thickness and testing in your RFQ so your material quotation is aligned with the project requisition.
Review X52 technical requirements ↓Use a complete material requisition. X52 alone does not identify the PSL, manufacturing route or delivery condition.
| Parameter | Purchase requirement |
|---|---|
| Grade | API 5L X52 / L360; match the full order designation |
| Product standard | API Specification 5L, 47th edition published June 2026; enter the contractual edition and applicable amendments |
| Product specification level | PSL1 or PSL2; include permissible delivery-condition suffix for PSL2 where required |
| Manufacturing method | Seamless (SMLS), high-frequency welded (HFW / ERW), submerged-arc welded (SAW), subject to approved mill, size and grade route |
| Pipe dimension | Actual outside diameter (OD) × specified wall thickness (WT); NPS / Schedule only when requested as a reference |
| Length | Random or fixed length as agreed, with length tolerance and handling requirements |
| Pipe ends | Plain, beveled or project-specified weld preparation; protect during transport |
| Surface protection | Black / mill finish, temporary rust protection or contracted external coating |
| Inspection package | Heat analysis, tensile, hydrostatic, NDE, toughness and other agreed project-specific tests |
| Documents | MTC, pipe traceability, test reports, mill route and required third-party release |
| Supply | Individual line items by OD × WT, PSL, length and tonnage; production and stock to be confirmed |
For X52, PSL1 and PSL2 have different control frameworks and may involve different permitted manufacturing and delivery conditions.
Order the X52 minimum-strength class under the specified API 5L edition, with process, pipe geometry, tensile requirements and inspection expressly identified.
PSL2 grades often carry delivery-condition suffixes. Requirements include additional chemistry, tensile ranges and testing conditions that depend on the edition, pipe size and manufacturing route.
These tables support early grade comparison. Acceptance is determined by the agreed API edition, PSL and manufacture / delivery condition.
| Property | X52 purchasing reference |
|---|---|
| Minimum yield strength, common X52 reference | 360 MPa / 52,200 psi |
| Minimum tensile strength, common X52 reference | 460 MPa / 66,700 psi |
| PSL1 reference | 360 MPa minimum yield and 460 MPa minimum tensile; confirm ordered edition |
| PSL2 X52N / X52Q / X52M historical yield range | 360–530 MPa; edition, size and testing rules govern |
| PSL2 historical tensile range | 460–760 MPa; edition, size and testing rules govern |
| PSL2 historical yield-to-tensile ratio | Typically ≤0.93 where applicable; applicability may depend on OD |
| Elongation | Calculated / specified by the standard test specimen and relevant edition |
| Weld-seam performance | Weld-seam tensile acceptance and qualification depend on the welded process |
Historical PSL2 values are provided for estimating and technical discussion. For API Spec 5L 47th edition, request the relevant current tables from the certified mill and confirm the MTC.
| Grade / condition | Older edition illustrative limit |
|---|---|
| X52N / L360N (historic PSL2 reference) | C ≤0.24%; Mn ≤1.40%; Si ≤0.45% |
| X52Q / L360Q (historic PSL2 reference) | C ≤0.18%; Mn ≤1.50%; Si ≤0.45% |
| X52M / L360M (historic PSL2 reference) | C ≤0.22%; Mn ≤1.40%; Si ≤0.45% |
| P / S (older PSL2 references) | P ≤0.025%; S ≤0.015% |
| Microalloying additions | V, Nb, Ti subject to process-specific individual / combined limits |
| Carbon equivalent | CEIIW / CEPcm per chemistry, wall and specification; verify calculation |
| Heat / product chemistry | Require heat and product analyses and MTC matching your purchase order |
Do not treat these values as guaranteed chemistry for every X52 pipe. Actual maximum levels, footnotes and carbon equivalent requirements vary by specification edition, PSL, thickness and processing route.
Manufacturing process affects pipe size availability, weld inspection, delivery condition and pipe-mill qualification.
Without a longitudinal weld seam. Confirm that the approved pipe mill can supply the specified X52 grade, pipe dimensions and heat-treated condition, together with required body inspection.
Formed strip with a longitudinal high-frequency weld. Specify seam treatment, permissible delivery state, weld NDE and the project's pipe mill qualification.
May be used for larger diameter line-pipe orders. Agree weld configuration, mechanical testing, body and weld NDE, dimensional control and mill approvals.
NPS and Schedule are useful size references, but for an API 5L material requisition state the specified OD × WT and tolerances.
| Nominal size | OD (mm) | SCH 40 WT (mm) | SCH 80 WT (mm) |
|---|---|---|---|
| NPS 1/2 | 21.3 | 2.77 | 3.73 |
| NPS 1 | 33.4 | 3.38 | 4.55 |
| NPS 2 | 60.3 | 3.91 | 5.54 |
| NPS 4 | 114.3 | 6.02 | 8.56 |
| NPS 6 | 168.3 | 7.11 | 10.97 |
| NPS 8 | 219.1 | 8.18 | 12.70 |
The schedule table is a dimensional aid and does not establish availability, allowable pressure, or project suitability.
A clear ITP reduces ambiguity between mill capabilities, project requirements and material release documentation.
Heat / product analysis, tensile values, Y/T ratio when applicable and traceability to grade and PSL.
Agree pressure, calibration, duration and reporting per the ordered API specification and contract.
Select body and weld-seam examination scope to match process, defect acceptance and project rules.
Charpy, DWTT, HIC, SSC or CO₂-service provisions only when required by the applicable specification and project.
Our quotation review can address testing, documentation and third-party witnessing before ordering.
Higher minimum yield strength can support a particular pipeline design, but operating environment, code, toughness and welding criteria govern material selection.
Pipelines carrying specified oil and natural gas streams under approved design and operating conditions.
Line pipe for gathering, transfer and process interfaces where the engineered specification calls for X52.
Pipeline-grade material for industrial energy networks where project codes accept the API 5L product.
Cut-to-length pipe and prepared ends for fabricated spools, tie-in work and associated weld procedures.
Bulk orders requiring traceable lots, consistent wall specification and planned export logistics.
Potential applications only after the relevant design, service assessment, supplements and material testing are agreed.
Provide the pipeline material specification, service description, route, diameter, wall design and required inspections. X52 can be assessed against those defined requirements; its grade name alone is not a service-life or corrosion guarantee.
Estimate bare-steel line-pipe mass using specified OD, wall thickness, pipe length and piece count. Schedule presets are included as dimensional references.
Calculation uses a nominal steel density of 7,850 kg/m³ and the annular pipe cross-section. The result excludes coatings, couplings, end caps, seawater contents and shipping materials.
Nominal bare-steel estimate; confirm actual net weight and mill tolerances.
Consistent grade control comes from the approved process, documented welding / heat treatment and traceability for every accepted pipe lot.
Manufacturing sequences vary by HFW, SAW and seamless route. Request the relevant mill qualification, certificates and inspection records rather than assuming all production methods are identical.
Explore Manufacturing →Support for line-pipe buyers who need clear technical correspondence, itemized quotations and documented export coordination.
Company-wide annual steel production of 8 million MT and reported regular stock of 1 million MT across all steel categories; X52 availability is checked per order.
Review the product level, X52 delivery condition, pipe dimensions, manufacturing route and inspection plan together.
Include testing, traceability, third-party witnessing and documentation requirements in your purchase specification.
Coordinate batch schedules, packing, markings, pipe-end protection and shipment documents for the destination.
Confirm the actual heat, pipe lot, test data and signed certificate requirements before shipment.
Pipe preparation requirements can affect the scope of the supply quotation, delivery lead time and export packing.
PSL, diameter and process requirements determine sourcing options. Every offer needs confirmation against the itemized material requisition.
Submit your X52 pipeline material schedule with requested pipe lengths, quantity by diameter and wall, mill route, PSL2 suffix and the required ITP. Quotations can then identify relevant stock or production conditions.
Bundle and handling arrangements should match the pipe diameter, wall thickness, protective coating and discharge conditions.
Strength values support initial screening. Material substitution requires full review of product standard, PSL, welding and pipeline design conditions.
| Pipe grade | Common minimum yield reference | Material selection note |
|---|---|---|
| API 5L Grade B / L245 | 245 MPa | Lower minimum yield class; use when design and procurement specification require Grade B |
| API 5L X52 / L360 | 360 MPa | This page: X52 strength class; specify PSL and approved delivery condition |
| API 5L X60 / L415 | 415 MPa | Next higher line-pipe class requiring design / welding / specification review |
| API 5L X65 / L450 | 450 MPa | Higher yield class with edition-specific chemistry and manufacturing limits |
| API 5L X70 / L485 | 485 MPa | Higher line-pipe grade specified by engineering design and material qualification |
| ASTM A106 Grade B | 240 MPa | High-temperature seamless process pipe; different product acceptance standard |
| ASTM A333 Grade 6 | 240 MPa | Low-temperature pipe with notch toughness criteria under its separate standard |
Compare grades for the next bill of materials or review alternative pipe standards required by your projects.
Answers to frequent technical and sourcing questions about X52/L360, PSL2, pipe dimensions, test records and quotations.
X52 and L360 identify the widely used minimum-yield class of about 360 MPa under API 5L. Procurement must also identify PSL, manufacturing process, any delivery suffix and acceptance tests.
API announced Specification 5L, 47th edition on June 2, 2026. Include the required edition and any project amendments in your purchase order.
Common X52 reference minimums are 360 MPa yield and 460 MPa tensile. PSL2 historically also sets upper limits; the ordered specification edition, pipe diameter and test conditions control actual acceptance.
PSL2 generally has additional grade/delivery designations, chemistry controls, tensile ranges and tougher inspection provisions. State the applicable edition and exact delivery-condition suffix when required.
These common PSL2 suffixes relate to delivery condition. Their eligibility, chemical composition and manufacturing route must be checked against the contracted edition and approved mill.
The standard covers permitted seamless and welded processes. Availability depends on the approved mill, OD, WT, delivery condition and project technical requirements.
They are useful dimension references, but your material requisition should state the actual outside diameter, specified wall thickness, length, tolerances and quantity.
No. Sour-gas suitability requires specific materials engineering, applicable API requirements and any HIC, SSC, toughness or corrosion-service testing requested by the project.
That depends on fluid composition, design pressure, impurities, moisture, corrosion controls, toughness and project codes. The 47th edition contains CO₂-related updates, but grade alone is not approval for a service.
Typically request the MTC, chemistry, tensile results, hydrostatic and NDE reports, dimensional measurements and heat traceability; add impact tests, ITP witness points or special tests as required.
It calculates the annulus cross-section from OD and wall thickness using nominal density 7,850 kg/m³, then multiplies by pipe length and count. Coatings, caps and packaging are excluded.
Send API edition, PSL, delivery suffix, OD × WT, pipe length and tonnage, manufacturing route, coating, end finish, test plan, MTC requirements, destination and target delivery date.
Send your X52 / L360 bill of materials, PSL, OD × WT, length and quantity. Include permitted mill route, end condition, coating and ITP requirements so the quotation can be matched to your project.
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Send your required grade, dimensions, quantity and destination. Our team will review the inquiry.
