API 5L Line Pipe Manufacturer & Supplier in China
Sino East Steel Group manufactures API 5L line pipes (Grade B, X42 to X70 in PSL1 & PSL2) in Tianjin for oil, natural gas, and petrochemical pipeline projects across the GCC, Africa, and Southeast Asia.
Real Production, Warehouse & Seaworthy Export Packaging
Why Procure Direct from Sino East Steel Group
💰 Direct Mill Pricing
Eliminate intermediate trading markups with transparent factory FOB/CIF pricing and flexible payment terms for volume contracts.
🛡️ Certified EN 10204 3.1 MTC
Full heat-number traceability, guaranteed mechanical/chemical tolerances, and complete third-party inspection (SGS/BV) compliance.
🚢 1x20GP Mixed Cargo Support
Consolidate various sizes, specifications, and hardware fasteners into single 25-ton container loads to minimize inventory overhead.
Manufacturing Specifications & Technical Range
| Standard & Grades | API 5L PSL1 / PSL2 (Gr.B, X42, X46, X52, X56, X60, X65, X70), ISO 3183, NACE MR0175 |
|---|---|
| Outer Diameter | Seamless: 1/2″ to 28″ (21.3mm – 711mm) | ERW/LSAW: 4″ to 48″ (114mm – 1219mm) |
| Wall Thickness | SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, SCH XXS (2.0mm – 50.0mm) |
| Length | SRL (5.8m – 6.0m), DRL (11.8m – 12.0m), Triple Random Lengths |
| Surface & Coating | Bare, Black Varnish, Anti-Rust Oil, 3LPE, 3LPP, FBE, Liquid Epoxy |
| Testing & Inspection | 100% Hydrostatic, Ultrasonic (UT), Eddy Current, MTC EN 10204 3.1 & 3.2 |
Ready to Procure Direct from Tianjin Steel Manufacturer?
Contact our senior sales engineers with your required size, grade, and destination port. We provide official CIF quotations and MTC samples within 15 minutes.
Complete Oilfield Drilling & Heavy Industrial Piping Portals
In addition to API Spec 5L line pipes, Sino East Steel supplies fully certified casing, production tubing, and heavy-wall seamless boiler pipes for complex energy infrastructure:
🛢️ API 5CT OCTG Casing & Tubing
J55, N80, L80 (H2S sour service), P110 casing (4-1/2″ to 20″) and tubing with BTC, LTC & Premium gas-tight connections.
🏭 Seamless Carbon Steel Pipes
ASTM A106 Gr.B, ASTM A53, ASTM A333 Grade 6 low-temp pipes from SCH 20 to SCH 160 & XXS for high-pressure boilers & refineries.
From Coil to Pipeline: Inside Our API 5L Production Line
Our API 5L line pipe is produced on dedicated ERW and LSAW lines in the Tianjin plant, fed by hot-rolled coils and plates from the same steelmaking group. The production route for every pipe is documented from the coil certificate to the final hydrostatic test, which is why we can issue a full EN 10204 3.1 certificate with heat numbers on every shipment.
The ERW line forms pipe in diameters from 1/2 inch to 24 inch, with weld integrity verified by 100 percent eddy-current testing and a hydrostatic test on every single pipe. Larger diameters up to 48 inch are produced on the LSAW (submerged arc) line, with both longitudinal and spiral options available for the pipeline and water transmission projects that dominate Gulf infrastructure spending.
Testing Before It Leaves the Mill
- Hydrostatic testing - every pipe is pressure-tested to the level required by the specification, with test certificates per pipe
- Eddy current / ultrasonic testing - 100 percent weld inspection on ERW production
- Mechanical testing - yield, tensile and elongation samples from every heat, plus impact testing for PSL2 grades
- Dimensional audit - outside diameter, wall thickness, ovality and end bevel checked against the standard
Because the plant is the manufacturer rather than a trader, we can adjust production to project requirements: PSL2 chemistry, impact testing at specified temperatures, custom bevel ends, and third-party witness testing by SGS, Bureau Veritas or TUV arranged before loading at the port.