Seamless Line Pipe
High-strength API 5L line pipes for oil and gas transmission. Seamless types — certified for critical pipeline projects worldwide.
API 5L PSL1/PSL2
X42–X80
GB/T 9711
ISO 3183
Seamless (SMLS)
Seamless Line Pipe
Line pipe is specifically designed and manufactured to API 5L standard for transporting oil, natural gas, and water in onshore and offshore pipeline systems. CREATEEL supplies seamless API 5L line pipe — pierced from solid billet with no longitudinal weld seam — in both PSL1 and PSL2 product specification levels across all standard grades from X42 through X80. Ideal for small-to-medium diameter high-pressure applications requiring maximum integrity.
- OD Range: 21.3mm – 711mm (1/2″ – 28″)
- Wall Thickness: 2.77mm – 50.8mm
- Grade: B, X42, X46, X52, X56, X60, X65, X70, X80
- PSL Level: PSL1 and PSL2
- Standard: API 5L, ISO 3183, GB/T 9711, DNV-OS-F101
Technical Specifications
Standards
Seamless line pipe standards and grades supplied by CREATEEL for oil & gas transmission.
| Standard | Available Steel Grades | Description |
|---|---|---|
| API 5L | Gr.B, X42, X52, X60, X65, X70 | Seamless line pipe for oil & gas transmission (PSL1 / PSL2) |
| GB/T 9711 | L245-L485 (Gr.B-X70) | Chinese national standard for seamless steel pipelines |
| EN ISO 3183 | L245-L485 | European / international standard for pipeline steel pipes |
| ISO 3183 | L245-L485 | International standard for seamless pipeline pipes |
Seamless Line Pipe Dimensions (OD × Wall Thickness, NPS)
Wall thickness in mm per ASME B36.10M, for API 5L PSL1/PSL2 seamless line pipe. – = not a standard schedule for that size. OD up to 720 mm on request.
| DN | NPS (in) | OD (mm) | SCH10 | SCH20 | STD | SCH40 | XS | SCH80 | SCH160 |
|---|---|---|---|---|---|---|---|---|---|
| 15 | 1/2 | 21.3 | 1.65 | – | 2.77 | 2.77 | 3.73 | 3.73 | 4.78 |
| 20 | 3/4 | 26.7 | 2.11 | – | 2.87 | 2.87 | 3.91 | 3.91 | 5.56 |
| 25 | 1 | 33.4 | 2.77 | – | 3.38 | 3.38 | 4.55 | 4.55 | 6.35 |
| 32 | 1-1/4 | 42.2 | 2.77 | – | 3.56 | 3.56 | 4.85 | 4.85 | 6.35 |
| 40 | 1-1/2 | 48.3 | 2.77 | – | 3.68 | 3.68 | 5.08 | 5.08 | 7.14 |
| 50 | 2 | 60.3 | 2.77 | – | 3.91 | 3.91 | 5.54 | 5.54 | 8.74 |
| 65 | 2-1/2 | 73.0 | 3.05 | – | 5.16 | 5.16 | 7.01 | 7.01 | 9.53 |
| 80 | 3 | 88.9 | 3.05 | – | 5.49 | 5.49 | 7.62 | 7.62 | 11.13 |
| 100 | 4 | 114.3 | 3.05 | – | 6.02 | 6.02 | 8.56 | 8.56 | 13.49 |
| 125 | 5 | 141.3 | 3.4 | – | 6.55 | 6.55 | 9.53 | 9.53 | 15.88 |
| 150 | 6 | 168.3 | 3.4 | – | 7.11 | 7.11 | 10.97 | 10.97 | 18.26 |
| 200 | 8 | 219.1 | 3.76 | 6.35 | 8.18 | 8.18 | 12.7 | 18.26 | 23.01 |
| 250 | 10 | 273.0 | 4.19 | 6.35 | 9.27 | 15.09 | 12.7 | 20.62 | 28.26 |
| 300 | 12 | 323.9 | 4.57 | 6.35 | 9.53 | 14.27 | 12.7 | 21.44 | 33.32 |
| 350 | 14 | 355.6 | 4.78 | 7.92 | 9.53 | – | 12.7 | 23.83 | – |
| 400 | 16 | 406.4 | 4.78 | 7.92 | 9.53 | – | 12.7 | 21.44 | – |
| 450 | 18 | 457.0 | 4.78 | 7.92 | 9.53 | – | 12.7 | 23.83 | – |
| 500 | 20 | 508.0 | 4.78 | 7.92 | 9.53 | – | 12.7 | 20.62 | – |
| 600 | 24 | 610.0 | – | – | 9.53 | – | 12.7 | 17.02 | – |
Chemical Composition (%) — API 5L
| Grade | C (max) | Mn (max) | Si (max) | P (max) | S (max) | CE (max) |
|---|---|---|---|---|---|---|
| Gr. B PSL1 | ≤0.28 | ≤1.20 | ≤0.45 | ≤0.030 | ≤0.030 | — |
| X42 PSL1 | ≤0.28 | ≤1.30 | ≤0.45 | ≤0.030 | ≤0.030 | — |
| X52 PSL1 | ≤0.28 | ≤1.40 | ≤0.45 | ≤0.030 | ≤0.030 | — |
| X60 PSL1 | ≤0.28 | ≤1.60 | ≤0.45 | ≤0.030 | ≤0.030 | — |
| Gr. B PSL2 | ≤0.22 | ≤1.20 | ≤0.45 | ≤0.025 | ≤0.015 | ≤0.15 |
| X42 PSL2 | ≤0.22 | ≤1.30 | ≤0.45 | ≤0.025 | ≤0.015 | ≤0.15 |
| X52 PSL2 | ≤0.22 | ≤1.40 | ≤0.45 | ≤0.025 | ≤0.015 | ≤0.25 |
| X60 PSL2 | ≤0.22 | ≤1.60 | ≤0.45 | ≤0.025 | ≤0.015 | ≤0.25 |
| X65 PSL2 | ≤0.22 | ≤1.60 | ≤0.45 | ≤0.025 | ≤0.015 | ≤0.25 |
| X70 PSL2 | ≤0.22 | ≤1.70 | ≤0.45 | ≤0.020 | ≤0.010 | ≤0.25 |
| X80 PSL2 | ≤0.18 | ≤1.90 | ≤0.45 | ≤0.020 | ≤0.010 | ≤0.25 |
CE = Carbon Equivalent = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15. Values apply to pipe body.
Mechanical Properties — PSL1
PSL1: Basic testing requirements. No impact testing required. Suitable for standard oil and gas service at ambient to moderate temperature.
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation | CVN Impact |
|---|---|---|---|---|
| Gr. B | 415–758 | 245–450 | ≥23 | — |
| X42 | 415–758 | 290–495 | ≥23 | — |
| X46 | 434–758 | 317–524 | ≥22 | — |
| X52 | 455–758 | 359–531 | ≥22 | — |
| X56 | 490–758 | 386–544 | ≥21 | — |
| X60 | 517–758 | 414–565 | ≥21 | — |
| X65 | 531–758 | 448–600 | ≥21 | — |
| X70 | 565–758 | 483–621 | ≥19 | — |
| X80 | 621–827 | 552–690 | ≥18 | — |
Mechanical Properties — PSL2
PSL2: Enhanced testing. Mandatory Charpy impact testing. Stricter chemistry. Suitable for sour service (HIC/SSC), offshore, and high-pressure transmission. HIC/SSC tests per NACE TM0284/TM0177 on request.
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation | CVN Impact (min.) |
|---|---|---|---|---|
| Gr. B PSL2 | 415–758 | 245–450 | ≥23 | 27 J @ 0°C |
| X42 PSL2 | 415–758 | 290–495 | ≥23 | 27 J @ 0°C |
| X52 PSL2 | 455–758 | 359–531 | ≥22 | 27 J @ −10°C |
| X60 PSL2 | 517–758 | 414–565 | ≥21 | 27 J @ −20°C |
| X65 PSL2 | 531–758 | 448–600 | ≥21 | 40 J @ −20°C |
| X70 PSL2 | 565–827 | 483–621 | ≥19 | 40 J @ −20°C |
| X80 PSL2 | 621–827 | 552–690 | ≥18 | 40 J @ −20°C |
Pipe Manufacturing Types
Standard Testing Requirements (API 5L)
Manufacturing Process
Our seamless steel pipes are manufactured through a rigorously controlled 12-step hot rolling process — from billet heating to final inspection — ensuring uniform mechanical properties, precise dimensions, and defect-free surfaces.
Billet Inspection & Cutting
Continuous-cast round billets are ultrasonically tested for internal defects, then cut to required lengths by abrasive sawing or shearing.
Rotary Hearth Heating
Billets are heated uniformly to 1200–1280°C in a rotary hearth furnace to achieve optimal plasticity for piercing while preventing overheating or decarburization.
Mannesmann Piercing
The heated billet is pierced over a pointed mandrel between two skewed rolls to form a hollow shell (mother tube), typically achieving a 3–4:1 elongation ratio.
Mandrel Mill Rolling
The hollow shell is rolled over a retained mandrel through a 5–8 stand continuous mandrel mill to reduce wall thickness and achieve uniform OD/WT dimensions.
Mandrel Extraction & Reheating
The mandrel is stripped from the shell; the shell is then reheated to ~950°C in an induction furnace before entering the stretch-reducing mill.
Stretch Reducing / Sizing
The pipe passes through 20–24 stands of stretch-reducing mill to achieve the final OD with tight tolerance (±0.5% OD) and uniform wall thickness, without an internal mandrel.
Cooling Bed Cooling
Pipes are transferred to a walking-beam cooling bed for slow, uniform air cooling to prevent bending and residual stress buildup.
Hot/Cold Straightening
Pipes are straightened by multi-roll cross-roll straighteners (6-roll or 10-roll) to achieve straightness ≤1 mm/m and eliminate ovality.
Cutting & End Facing
Pipes are cut to commercial lengths (5.8m/6m/11.8m/random) and both ends are faced and beveled (30°+5°) for welding, with burrs removed.
NDT & Hydrostatic Testing
100% ultrasonic testing for wall thickness and laminations, eddy current testing for surface cracks, and hydrostatic pressure testing to API/GB standards.
Surface Inspection & Marking
Visual and dimensional inspection of OD, WT, length, and surface quality; stenciling grade, heat number, OD×WT, standard, and manufacturer mark.
Final Packaging & Shipping
Pipes are bundled with steel strips, end-protected with plastic caps or bevel protectors, slung with lifting tags, and loaded for shipment with mill test certificates.
Applications
Where our products deliver proven performance across industries worldwide.
High-Pressure Gas Transmission
Seamless line pipe eliminates the weld seam entirely for the highest-pressure gas transmission segments, tie-ins, and compressor station piping where weld inspection burden must be minimized.
✓ API 5L PSL2 X42–X70
Sour Service Gathering Systems
Seamless PSL2 in restricted chemistries with HIC/SSC qualification handles raw sour gas gathering where wet H2S attacks weld seams first.
✓ NACE MR0175 / ISO 15156
Offshore Riser & Platform Piping
Platform piping, flexible-joint spools, and short offshore crossings use seamless for reliability and code acceptance in critical, hard-to-repair service.
✓ DNV / API RP 1111 options
Wellhead & Flowline Tie-Ins
Seamless flowlines and wellhead tie-ins handle high pressure, temperature cycling, and mechanical loads close to the wellbore.
✓ API 5L / 5CT transition sizes
City Gate & Distribution Interconnects
High-pressure city gate stations and distribution interconnects use seamless for valve manifolds and sections where radiography of welds is impractical.
✓ ASME B31.8 locations classes
Arctic & Seismic Zones
Charpy-tested low-temperature seamless grades handle arctic construction and high-seismicity routes where strain demand exceeds welded-pipe capability.
✓ CVN tested to -45°C
Frequently Asked Questions
What is seamless line pipe?＋
Line pipe made by piercing and rolling a solid billet — no longitudinal weld — specified for the highest pressures and most critical service segments per API 5L.
What sizes are available in seamless line pipe?＋
Typically ½" to 24" OD (up to 28" on request), wall to 60 mm, in PSL2 Gr. B–X70 and above.
When is seamless preferred over welded line pipe?＋
For the highest pressure classes, sour service, thick walls, short critical segments, arctic toughness demands, and locations where weld inspection logistics are prohibitive.
What standards and grades do you offer?＋
API 5L PSL1/PSL2 Gr. B–X80, ISO 3183, GB/T 9711, with sour service (NACE MR0175) and low-temperature Charpy options.
How is seamless line pipe tested?＋
Hydrostatic testing of every length, 100% ultrasonic body and end inspection, eddy current on small sizes, plus tensile, Charpy, and flatten tests per lot.
What is the difference between PSL1 and PSL2 seamless?＋
PSL2 adds Charpy impact requirements, tighter chemistry limits, a capped yield-to-tensile ratio (≤ 0.92 for X42–X70), and mandatory CVN at design temperature.
Do you provide seamless line pipe with coatings?＋
Yes — FBE, dual-FBE, 3PE/3PP and internal epoxy, applied with single-source responsibility and coating QC documentation.
What is the minimum order quantity and lead time?＋
Stock sizes from 5–10 tons; produced sizes typically 6–10 weeks depending on grade and testing. Contact us for a firm quotation.
What documentation is provided?＋
EN 10204 3.1 MTCs with heat traceability, full NDT/hydro records, CVN and chemistry reports; 3.2 third-party certification on request.
Can seamless line pipe be used for sour gas?＋
Yes, when manufactured to restricted chemistries and tested for HIC/SSC per NACE MR0175 / ISO 15156 — we supply fully qualified sour-service material.
Ready to Order Seamless Line Pipes?
Get competitive pricing on API 5L / ASTM A106 / ASTM A53 seamless line pipes for high-pressure oil, gas, and petrochemical applications. Full traceability and MTRs provided.
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