Seamless Line Pipes

1. Raw Material Preparation: 

Selection of high-quality steel billets (carbon/alloy/stainless steel) based on material grade and application requirements.

2. Piercing: 

Heating steel billets to high temperatures and piercing to form a hollow shell using a mandrel mill, ensuring uniform wall thickness.

3. Rolling: 

Precision rolling of the hollow shell to achieve the desired outer diameter and wall thickness, maintaining strict dimensional tolerances.

4. Sizing & Straightening: 

Calibrating the pipe to meet ASME B36.10 standards for roundness and straightness, ensuring easy on-site installation.

5. Heat Treatment: 

Annealing, quenching, or tempering (depending on grade) to enhance strength, toughness, and high-temperature resistance—critical for alloy steel variants.

6. Surface Treatment: 

Pickling and passivation (for stainless steel), or anti-corrosion coating (3PE/FBE) to withstand harsh environmental conditions.

7. Testing & Inspection: 

Comprehensive non-destructive testing (NDT) including ultrasonic (UT), hydrostatic, and eddy current testing; mechanical tests (tensile, hardness, Charpy V-notch impact).

8. Packaging: 

Preparation for global shipping with protective materials.

Superior Strength & Durability: 

No welded seams eliminate weak points, ensuring reliability in high-pressure oil&gas transmission and industrial applications.

High Pressure & Temperature Resistance: 

Handles extreme pressure (API 5L PSL2) and temperatures up to 1000°C (alloy steel), suitable for power plants and petrochemical systems.

Corrosion Resistance: 

Stainless steel (TP304/316) and coated carbon steel variants resist coastal salt spray, sour gas (NACE MR0175 compliant), and chemical erosion.

Efficient Flow: 

Smooth internal surface reduces fluid friction and scaling, improving transmission efficiency for oil, gas, and water.

Leak-Proof Reliability: 

No weld defects minimize leakage risks, ensuring long-term safety in critical fluid transport.

Climate Adaptability: 

Performs reliably in desert heat, tropical humidity, and extreme temperature fluctuations across global regions.

Our Seamless Line Pipes comply with international and regional standards for global project approval:

• International Standards: API 5L (PSL1/PSL2), ASTM A106, ASTM A53, ASME B36.10, ISO 3183
• Special Certifications: ISO 9001, PED 2014/68/EU, NACE MR0175 (sour service compliance)
• Regional Compliance: SASO (Middle East), SONCAP (Africa), SNI (Indonesia), TIS (Thailand), BIS (India)
• All orders include material test certificates (MTC), NDT reports, and compliance documents for customs clearance.

Packaging

• Pipes are fitted with plastic caps on both ends to prevent rust, dust, and damage.
• Bundled with high-strength steel straps, wrapped in moisture-proof film for humid regions and anti-corrosion paper for deserts.
• Large-diameter pipes (OD ≥16") are shipped individually with protective steel brackets to avoid deformation.
• Placed on ISPM 15-certified wooden pallets for international shipping compliance.
• Clear English labeling includes product name, grade, OD/WT/length, batch number, and handling instructions.

Shipping

• Lead Time: Standard orders (≤150 tons): 18-28 working days; Bulk orders (＞150 tons): 28-40 working days; Custom grades/lengths: 22-35 working days.
• Logistics Partners: Maersk, CMA CGM, Aramex, and regional carriers for inland delivery to construction/industrial sites.
• Delivery Coverage: Port-to-port, door-to-door for major cities, and tailored solutions for remote offshore/onshore project locations.
• Global Reach: Supply to all regions except Europe and the US, with optimized shipping routes for each market.

RFQ Question: Do your API 5L X70 seamless line pipes resist coastal salt spray for offshore oil&gas use? What’s the delivery time?

Answer: Yes, our API 5L X70 PSL2 pipes come with 3PE anti-corrosion coating, resisting coastal salt spray.

RFQ Question: Need high-temperature seamless pipes for power plant boiler tubes—what grade do you recommend?

Answer: We recommend ASTM A335 P22 alloy pipes, designed for high temperatures up to 1000°C.

RFQ Question: What’s the warranty for API 5L X52 seamless pipes used in water mains? Lead time for bulk orders?

Answer: Our API 5L X52 pipes come with a 5-year warranty against manufacturing defects. For bulk orders (＞150 tons), lead time is 25-35 working days.

RFQ Question: Are your seamless line pipes compatible with sour gas transmission? Are they easy to weld?

Answer: Yes, our NACE MR0175-compliant pipes are suitable for sour gas transmission. They feature beveled ends for easy on-site welding.

RFQ Question: Can your seamless pipes handle extreme desert heat for onshore oil pipelines?

Answer: Our API 5L X65 pipes withstand extreme desert heat (up to 55°C) and high pressure. They meet API 5L PSL2 standards with hydrostatic test reports included.