Oil & Gas Transmission
Long-distance natural gas and crude oil pipelines, sour service lines, submarine pipelines, refined-product lines and city gas networks.
API 5L · ISO 3183 · DNVGL-ST-F101 · NACE MR0175/ISO 15156
Factory-direct LSAW Steel Pipe Manufacturer for Oil, Gas, Refining and New Energy Pipelines
Two JCOE production lines with a combined diameter range of Ø406.4 – Ø1422.4 mm, wall thickness 6.35 – 52.37 mm and grades from L245 / Gr.B to L555 / X80. Every pipe passes 11 × 100% in-process inspections and is tested in a CNAS-accredited laboratory.
API SPEC 5L / ISO 3183 PSL2
DNVGL-ST-F101
NACE MR0175 / ISO 15156
ASME B31.12 (H₂)
CNAS Laboratory
FOB · CFR · CIF · DAP
Long-distance transmission · Submarine pipelines · Sour service · Hydrogen · Supercritical CO₂ · Bimetallic clad pipe
Factory-direct · established 2013
13 years in steel pipeØ406–1422 mmL245–L555 / X80Seamless 1/2"–24"11 × 100% inspectionCNAS laboratory24 h quotation
Product Range
Six application lines from two JCOE workshops
Tell us the medium, design pressure, temperature and installation method — we will confirm grade, wall thickness, coating and test programme.
Refining & Chemical Process Pipe
Piping carrying high-temperature, high-pressure and low-temperature liquid or gas media in refineries and chemical plants.
GB/T 9711 · API 5L · ASTM A671 / A672 / A691
Coated Anti-Corrosion Pipe
External FBE, 2LPE, 3LPE, 2LPP and 3LPP systems plus internal epoxy and drag-reducing epoxy lining for buried and wet service.
ISO 21809 · DIN 30670 · CSA Z245.21
Hydrogen & CO₂ Transmission
Pipe developed for hydrogen embrittlement, hydrogen corrosion and leakage risk, and for supercritical CO₂ service where low-temperature toughness is critical.
ASME B31.12 · CGA G-5.6 · AIGA 033/14
High-end Structure Pipe
Structural pipe for high strength, high toughness and good weldability in weather-exposed and marine conditions, with tolerances tighter than line pipe.
ASTM A252 GR.3 · EN 10219 S355J2H
Bimetallic Cladding Pipe
Stainless or alloy liner metallurgically bonded to a carbon steel body: corrosion resistance of the liner with the strength and cost of carbon steel.
JCO cladding plate process · TIG internal welding
Workshop 1 — Oil & Gas Line Pipe
API SPEC 5L / ISO 3183 PSL2- Outside diameter
- Ø508 – Ø1422 mm (20" – 56")
- Wall thickness
- 7.92 – 52.37 mm
- Steel grade
- Gr.B/L245 – X80/L555
- Pipe length
- 6 – 12 m, fixed length available
Gr.B / L245X42 / L290X46 / L320X52 / L360
X60 / L415X65 / L450X70 / L485X80 / L555
Workshop 2 — New Energy Line Pipe
API SPEC 5L / ISO 3183 PSL2- Outside diameter
- Ø406 – Ø1016 mm (16" – 40")
- Wall thickness
- 6.35 – 35.71 mm
- Steel grade
- Gr.B/L245 – X80/L555
- Focus
- Hydrogen, CO₂ and new-energy transmission
Gr.B / L245X42 / L290X52 / L360X65 / L450X80 / L555
View the full product catalogue → Size & wall-thickness capability tables →
Seamless Steel Pipe
Seamless, alloy, stainless and boiler pipe — sourced to your specification
Alongside the large-diameter LSAW line pipe, we supply seamless steel pipe for oil & gas, water, boiler, heat-exchanger and process duty. Send us the standard, grade, size and quantity — we source it in Hebei and come back with a firm quotation within 24 hours.
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Size range
OD 1/2"–24" (to 26" on request), wall thickness 3–25 mm, heavy wall up to 60 mm; random 6 m / 12 m or fixed length. Sizes outside this range are sourced on request.
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Standards & grades
API 5L Gr.B–X70 · ASTM A106 Gr.B/C · A53 · A333 Gr.1 / 3 / 6 / 8 · A335 P1–P92 · A213 · A312 · API 5CT. Other standards and grades sourced on request.
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Documents
Mill test certificate to EN 10204 3.1, dimensional records, third-party inspection (SGS / BV / Intertek / TÜV) arranged on request, packing list and a full set of export documents.
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Ends & surface
Plain, bevelled, threaded or capped ends; black, pickled, oiled or galvanised finish as required.
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Packing
Hexagonal bundles, steel strapping, plastic end caps and moisture protection — loaded loose or in containers.
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Delivery terms
FOB, CFR, CIF and DAP terms are confirmed in the signed contract.
Ready stock — seamless pipe held in Hebei
Standard sizes are held in stock, stored indoors with end protection and stencilled with grade, size and heat number. Supplied to ASTM A106 / A53 or API 5L as required, with EN 10204 3.1 certificates.
| OD (mm) | Size | Wall thickness (mm) | Schedule |
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| 33.4 | 1″ | 3.38 | SCH40 |
| 48.3 | 1½″ | 3.68 | SCH40 |
| 60.3 | 2″ | 3.91 / 5.54 | SCH40 / SCH80 |
| 76.0 | 76 mm (metric) | 4.00 / 5.16 | — |
| 88.9 | 3″ | 7.62 | SCH80 |
| 114.3 | 4″ | 5.00 / 6.02 / 8.56 | — / SCH40 / SCH80 |
| 141.3 | 5″ | 9.53 | SCH80 |
| 168.3 | 6″ | 7.11 / 10.97 | SCH40 / SCH80 |
| 219.1 | 8″ | 6.35 / 8.18 / 12.70 | — / SCH40 / SCH80 |
| 273.1 | 10″ | 6.35 | — |
Heavy wall in stock (6–12 m): 89 × 12 / 16 / 20 / 25 mm · 102 × 8 / 10 / 12 / 20 / 25 mm · 114 × 12 / 16 mm
Sizes not in stock are produced on short lead time — send the outside diameter × wall thickness and quantity, and we confirm availability the same day.
Manufacturing Capability
Why JCOE forming matters for your project
LSAW pipe is made from a single plate or uncoiled plate, formed by J-C-O or U-O bending, welded inside and outside by submerged arc welding, then cold-expanded online to remove internal stress.
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JCOE forming
Few moulds, wide diameter coverage, high wall-thickness limit, fast changeover — small batches stay economical.
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Robotised line
Robot cutting of run-on/run-off plates, robot marking, unmanned pre-bending and centralised welding control save about 30% of labour.
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Digital welding
All-digital welding machines with a centralised welding control system deliver a 99% welding pass rate.
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100% expansion
The full pipe body is mechanically expanded, giving high ovality and straightness accuracy and evenly distributed residual stress.
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Two phased-array UT sets
Weld flaw detection before and after the hydrostatic test, so both as-welded and expanded conditions are verified.
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Double-station X-ray
Online radiographic inspection on two stations with imported flat panels for clear static and dynamic imaging.
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Full traceability
Automated line control with full-process information management and digital quality traceability, plate to finished pipe.
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Sour & low temperature
Chemistry, rolling and heat treatment tuned for HIC/SSC service and for low-temperature impact requirements.
Quality Control
Eleven × 100% inspections on every pipe
Not a sample. Not a batch. Every plate and every pipe goes through the full programme below.
Plate stage
- 100% plate appearance inspection
- 100% automatic ultrasonic testing of steel plate
Pipe body & weld
- 100% inner weld appearance inspection
- 100% X-ray industrial TV inspection of the weld before expansion
- 100% X-ray industrial TV inspection of the weld after expansion
- 100% phased-array ultrasonic testing of the weld after expansion
- 100% online automatic detection of full pipe body expansion
- 100% hydrostatic test
- 100% pipe appearance & dimensional inspection
Pipe end
- 100% digital X-ray image examination of the pipe end
- 100% manual ultrasonic inspection of the pipe end
Our CNAS-accredited laboratory
All experimental work is carried out in a national CNAS-accredited laboratory, so results are produced and traceable in-house rather than being outsourced.
- Raw material inspection
- In-process inspection
- Laboratory re-testing
- Final inspection & document filing
Coating tests — impact, tensile strength, holiday (spark), peel strength, cathodic disbondment and indentation — are completed in the same laboratory.
Packing & Loading
Bundled, protected and loaded — how your pipe travels
Pipe ends are protected and every bundle is ratchet-strapped before it leaves the works. Pipe is stored indoors until loading, then supervised into the container or onto the vessel — and photographs of the loaded consignment are issued to you before departure.
Service
Support that continues after the vessel sails
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Customised solution
The pipe specification is designed around three inputs — your use requirement, the engineering site conditions and your cost budget — and issued as an exclusive solution rather than a catalogue page.
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Documentation
EN 10204 3.1 mill certificates, dimensional records, hydrostatic and NDT reports, coating DFT and holiday reports, packing list, invoice, bill of lading and certificate of origin.
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Export logistics
FOB, CFR, CIF and DAP terms; end protection, strapping and loading photographs issued before departure; experience with West Africa, North Africa, the Middle East and Southeast Asia.
Quality Concept
Four principles behind every pipe
Careful planning
Plan carefully and implement the quality management system conscientiously, so control works in practice rather than on paper.
Fine management
Fine-grained management of product characteristics — the gap between good pipe and zero-defect pipe is closed by detail.
Accurate positioning
Accurate positioning and clear communication, specifying and supplying to the actual project and market requirement.
Continuous innovation
Continuous improvement and dependable service, with the aim of being a world-class pipeline supply partner.
Factory-Direct Supply
Factory-direct: one team from specification to loading
Thirteen years in the steel pipe business (established 2013) — you deal with the export team that sits next to the production line, and the price you receive is the production price plus export service, not a re-traded price.
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Technical review before pricing
Your line list, piping class or tender document is reviewed against the standard — grade, wall thickness, impact temperature and delivery risk are flagged before you commit.
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Factory-direct pricing
Quotations come from the production cost of the line the pipe is rolled on, with the export service included — not a re-traded price.
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Inspection in-house
The 11 × 100% in-process inspection programme runs on our line, and third-party attendance (SGS, BV, Intertek, TÜV or your nominated inspector) is arranged before loading.
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Document package
MTC to EN 10204 3.1, test and inspection records, coating DFT and holiday reports, packing list and certificate of origin in one set.
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Packing & loading
End protection, strapping and loading supervision, with photographs issued before the vessel departs.
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Logistics & after-sales
FOB / CFR / CIF / DAP shipments and after-sales handling, with technical attendance arranged within 48 hours at home and 96 hours overseas.
Catalogue
Seven product families — one page each, no duplication
- 1 · LSAW Line Pipe (Oil & Gas Transmission)API 5L PSL2 · ISO 3183 · DNVGL-ST-F101 · Ø406–1422 mm · to X80
- 2 · Seamless Steel PipeAPI 5L · A106 · A53 · A333 · A335 P1–P92 · A213 · A312 · API 5CT · precision tube
- 3 · Process & Alloy Steel PipeASTM A671 / A672 / A691 · 2¼Cr CL32 · 09MnNiDR to −70 °C
- 4 · Anti-Corrosion Coated PipeFBE · 2LPE · 3LPE · 2LPP · 3LPP · internal epoxy / drag reducing
- 5 · Hydrogen & CO₂ Transmission PipeASME B31.12 · CGA G-5.6 · AIGA 033/14
- 6 · High-end Structural Steel PipeASTM A252 GR.3 · EN 10219 S355J2H
- 7 · Bimetallic Cladding PipeStainless / alloy liner + carbon steel body
Export Markets
Supplying pipelines across the Middle East, Africa, Southeast Asia and beyond
With Ø406–1422 mm and grades to X80 / L555 we cover the large-diameter transmission projects that dominate these markets. Tell us the destination port and we will quote FOB, CFR, CIF or DAP.
13+Years in steel pipe supply
Ø406–1422mm outside diameter
to X80L555 steel grade
24 hQuotation response
Middle East
UAE · Saudi Arabia · Kuwait · Iraq — line pipe and coated pipe for oil, gas and water transmission.
Southeast Asia
Vietnam · Indonesia · Malaysia · Philippines — transmission, process and structural pipe.
North & West Africa
Oil, gas and water lines, served in French, Arabic and English.
Southern Africa
Angola · Mozambique · Namibia — served in Portuguese, with FBE / 3LPE coated line pipe for water, oil and gas projects.
Europe & Russia / CIS
Pipeline and process pipe to EN, ISO and API standards.
Australia
New-energy and process pipe, including hydrogen service piping.
Americas
North and South American projects — line pipe and clad pipe.
FAQ
Questions project buyers ask
What is the minimum order quantity for LSAW pipe?
Because JCOE forming covers a wide diameter range with few moulds and fast changeover, small batches are practical as well as volume orders — typically from one container equivalent, and project quantities from a few hundred tonnes upwards.
Which standards can you produce to?
API SPEC 5L / ISO 3183 PSL1 & PSL2, GB/T 9711, DNVGL-ST-F101 for submarine pipelines, NACE MR0175 / ISO 15156 for sour service, ASTM A671 / A672 / A691 for process pipe, ASME B31.12 and CGA G-5.6 for hydrogen service, ASTM A252 and EN 10219 for structural pipe.
What inspection documentation comes with the pipe?
EN 10204 3.1 mill test certificates plus the results of the 11 × 100% in-process inspections: plate appearance and ultrasonic testing, inner weld appearance, X-ray before and after expansion, phased-array ultrasonic testing, full-body expansion monitoring, hydrostatic test, dimensional inspection, and pipe-end digital X-ray and manual ultrasonic testing. Third-party inspection (SGS, BV, TÜV) can be organised.
Can you supply coated pipe and sour-service pipe?
Yes. FBE, 2LPE, 3LPE, 2LPP and 3LPP external coating with internal epoxy or drag-reducing lining; sour service to NACE MR0175 / ISO 15156 with agreed HIC and SSC acceptance criteria.
What is the lead time and payment term?
Typically 25–45 days after deposit, depending on size, grade and quantity. Payment is normally T/T 30% deposit with 70% against copy of B/L, or 100% irrevocable L/C at sight.
Do you supply fittings and prefabricated spools?
Bends, tees, reducers and prefabricated pipe spools can be supplied together with the pipe, so the site does not have to match materials from different suppliers.
Request a Quotation
Send your line list — firm quotation within 24 hours
Send the standard, outside diameter, wall thickness, grade, quantity and destination port. If you only have a tender document or a piping class, send that instead — we will read it and come back with the pipe specification.
| Sales email | export@steegaoyangtrde.com |
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| Contact | ✉️ Email us |
| Working hours | Monday–Saturday, 08:30–20:00 (GMT+8) — Email monitored outside hours |
We speak your language
English · Français · العربية · Português
The same engineer follows your project from quotation through to loading. Write to us in English, French, Arabic or Portuguese.
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Français
Fabricant et exportateur de tuyaux LSAW (JCOE) pour pipelines pétroliers et gaziers et le raffinage : Ø406–1422 mm, épaisseur 6,35–52,37 mm. Pour l'hydrogène et le CO₂ : Ø406–1016 mm, épaisseur 6,35–35,71 mm. Nuances L245 à L555 / X80, revêtement FBE / 3LPE.
Certificats EN 10204 3.1, laboratoire CNAS, contrôle par tiers (SGS/BV), livraison FOB/CIF. Devis ferme sous 24 heures.
Voir la page française
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العربية
مصنّع ومصدّر لـأنابيب LSAW (JCOE) لخطوط النفط والغاز والتكرير: القطر 406–1422 مم، السماكة 6.35–52.37 مم. للهيدروجين وثاني أكسيد الكربون: القطر 406–1016 مم، السماكة 6.35–35.71 مم. الدرجات L245 حتى L555 / X80، مع طلاء FBE / 3LPE.
شهادات EN 10204 3.1، مختبر CNAS، تفتيش طرف ثالث (SGS/BV)، شحن FOB/CIF. عرض سعر ثابت خلال 24 ساعة.
الصفحة العربية
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Português — Angola
Fabricante e exportador de tubos de aço LSAW (JCOE) para gasodutos e oleodutos e refinação: Ø406–1422 mm, espessura 6,35–52,37 mm. Para hidrogénio e CO₂: Ø406–1016 mm, espessura 6,35–35,71 mm. Classes L245 a L555 / X80, revestimento FBE / 3LPE.
Certificados EN 10204 3.1, laboratório CNAS, inspeção por terceiros (SGS/BV), entrega FOB / CIF. Orçamento firme em 24 horas.
Página em portuguêsHave a tender document or line list?
Send it as it is. You will receive the material confirmation, weight calculation and price.