Product Basic Information
Product Name: MS Seamless Pipe API 5L
Other Name: API 5L Carbon Steel Seamless Pipe, API 5L Line Pipe
Material: Carbon Steel
Process: Hot Rolled / Cold Drawn Seamless
Standard: API 5L
End Type: Plain End / Beveled End / Threaded End
Surface Treatment: Black Varnish, Anti-rust Oil, Galvanized, 3PE / FBE Coating
Packing: Bundled with Steel Strips, Wooden Case, or as Customer's Request
Brand: Customizable (OEM & ODM Available)
Place of Origin: China
Trade Term: FOB, CFR, CIF, DDP, DDU
Payment Term: T/T, L/C, Western Union
Delivery Time: 7–25 working days, depends on order quantity
MOQ: 1 Ton
Certificates: ISO 9001, API 5L Certificate, Mill Test Certificate (MTC)
Specifications
| Outside Diameter: 21.3mm – 610mm |
| Wall Thickness: 2.11mm – 22.2mm |
| Length: Random Length 5.8m / 6m, Fixed Length 11.8m / 12m, or Custom Length |
| Grade: API 5L Gr.B, X42, X46, X52, X56, X60, X65, X70, X80 |
| PSL Level: PSL1, PSL2 |
Note: PSL2 has stricter requirements on chemical composition, mechanical properties and impact test compared with PSL1.
Material Standard
API 5L is the American Petroleum Institute specification for line pipe, covering seamless and welded steel pipes used for oil, gas and fluid transmission pipeline systems. Our MS seamless pipe strictly complies with API 5L standard, including PSL1 and PSL2 requirements. All raw materials are sourced from qualified steel mills, full traceability for each heat number and batch.
Chemical Composition (Typical, wt%)
| Grade | C ≤ | Mn ≤ | P ≤ | S ≤ | Si |
| Gr.B | 0.24 | 1.2 | 0.03 | 0.03 | 0.40 max |
| X42 | 0.24 | 1.3 | 0.03 | 0.03 | 0.40 max |
| X52 | 0.24 | 1.4 | 0.025 | 0.025 | 0.40 max |
| X60 | 0.24 | 1.5 | 0.025 | 0.025 | 0.40 max |
| X65 | 0.24 | 1.6 | 0.025 | 0.025 | 0.40 max |
| X70 | 0.24 | 1.65 | 0.02 | 0.02 | 0.40 max |
Remark: Exact chemical data follows official API 5L standard and MTC.
Mechanical Properties
| Grade | Minimum Yield Strength (MPa) | Minimum Tensile Strength (MPa) | Elongation Min (%) |
| Gr.B | 241 | 415 | 21 |
| X42 | 290 | 415 | 21 |
| X52 | 359 | 455 | 20 |
| X60 | 414 | 517 | 18 |
| X65 | 448 | 531 | 18 |
| X70 | 483 | 565 | 17 |
Additional test for PSL2: Charpy V-notch impact test at required temperature.
Production Process
Raw Steel Billet Inspection → Heating → Piercing → Hot Rolling / Cold Drawing → Sizing & Straightening → Cooling → Cutting to Length → Visual Inspection → NDT / Hydrostatic Test → Surface Treatment → Marking → Packing → Shipment
| Billet incoming inspection: check heat number, chemical report, surface defect |
| High temperature piercing to form hollow tube shell |
| Precision rolling to control OD & wall thickness tolerance |
| Straightening to guarantee straightness |
| Cutting according to customer required length |
| Non-destructive testing and hydro test |
| Mark pipe info: standard, grade, heat no., size, PSL, manufacturer |
| Anti-rust treatment and packing |
Application
| Oil & natural gas transmission pipelines (onshore & offshore) |
| Crude oil, natural gas, water and slurry transportation |
| Pipeline project for petroleum industry |
| Refinery and petrochemical plant piping |
| City gas distribution network |
| Low and medium pressure fluid conveying system |
| Pipeline for power station and water treatment project |
Product Advantages
✅ Strictly follow API 5L standard, PSL1 & PSL2 available.
✅ Stable dimension tolerance, uniform wall thickness.
✅ Excellent pressure resistance and impact toughness.
✅ Complete test records and traceable MTC for every batch.
✅ Multiple anti-corrosion coating options (3PE, FBE, black paint).
✅ Fast production & flexible delivery schedule.
✅ Professional export packaging to avoid damage during sea transport.
✅ Support third-party inspection: SGS, BV, TÜV.
✅ Competitive factory direct price, no middleman.
✅ Technical support for pipeline project selection.
✅ Custom end machining, length and marking service.
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