Description
Factory-direct seamless pipe supply — ASTM A106 and API 5L grades rolled, tested, and shipped from our own mill with full heat-level traceability documentation.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A106 / API 5L Seamless Carbon Steel Pipe (20# / 45#) |
| Product Type | Seamless Steel Pipe |
| Steel Grade | 20#, 45#, ASTM A106 Gr.A / Gr.B, API 5CT, API 5L |
| Standard | ASTM A106, API 5CT, API 5L, BS, JIS, DIN, ISO 9001 |
| Section Shape | Round |
| Size Range (OD) | 10 – 609 mm |
| Wall Thickness | 1.65 – 59.54 mm |
| Length | 5.8 – 14 m (standard export length) |
| Technique | Hot Rolled / Cold Rolled / Cold Drawn |
| Surface Treatment | Hot Rolled, Oiled / Non-oiled |
| Tolerance | ±5% / ±1% |
| Ends | Plain / Beveled (per standard) |
| Application | Fluid Pipe, Boiler Pipe, Drill Pipe, Hydraulic Pipe, Gas Pipe, Oil Pipe, Chemical Fertilizer Pipe, Structure Pipe, Fluid Transportation, Machinery Parts, High-Stress Components |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas (EPC) | API 5L line pipe for gas transmission, drill pipe, downhole casing |
| Power & Industrial | High-pressure boiler tubes, chemical fertilizer plant piping, steam lines |
| Machinery & Hydraulic | Hydraulic cylinder barrels, mechanical parts, load-bearing structural pipe |
| Infrastructure | Fluid transportation networks, water supply mains, structural columns |
What Wall-Thickness Tolerance Costs on a Seamless Pipe Order
Negative tolerance beyond standard limits is the single most expensive mistake in overseas pipe procurement.
I once loaded a container of thick-wall pipe for a Middle East client. The wall thickness ran well below the acceptable negative tolerance band. Their third-party inspector rejected the entire lot at the destination port — the whole container came back for re-rolling, and the freight penalty alone ran into tens of thousands. Since then, every batch of 20# and 45# pipe that leaves our facility gets personally measured on the ultrasonic gauge before packing. [NEED_CITE: ASTM A106 dimensional tolerance requirements for seamless pipe]
When you source an ASTM A106 API 5L seamless carbon steel pipe supplier from China, the distance between your spec sheet and the actual product on the dock is where projects bleed money. Material certificates that don’t match the heat number, coating thickness that fades during ocean transit, and shop drawings that never align with as-fabricated dimensions — these are not rare exceptions. They are the default experience when procurement is fragmented across trading companies and unverified workshops.
Matching Grade and Process to Pressure and Structural Demands
The 10–609 mm OD and 1.65–59.54 mm WT range of our ASTM A106 API 5L seamless carbon steel pipe supplier inventory covers everything from thin-wall fluid lines in chemical plants to heavy-wall pressure vessels and drill string components. Hot-rolled 20# pipe serves general fluid transport where formability matters more than ultimate strength, while cold-drawn 45# delivers the tighter dimensional control and higher yield needed for hydraulic cylinders and machined mechanical parts. API 5L grades move directly into EPC energy projects without secondary certification, because the material chain — from our own steel mill through final inspection — never breaks.
Engineering Compliance and Certification Pathways
Seamless carbon steel pipe for pressure service must satisfy both dimensional standards and material verification requirements simultaneously. ASTM A106 governs high-temperature service in North American projects, while API 5L applies to pipeline transport in oil and gas EPC scopes. European and Middle Eastern tenders often cross-reference EN standards alongside ASTM, requiring dual documentation. [NEED_CITE: ASTM A106 vs API 5L material specification comparison] Our mill test certificates carry full chemical composition and mechanical property data per heat number, and third-party inspection through SGS, BV, or Lloyds is available at the buyer’s request before shipment. For projects requiring beveled ends, specific cut-to-length, or bending to radius, all processing happens in-house — eliminating the risk of mixed batches from secondary workshops.
How Steel Grade and Manufacturing Process Define Performance
The 20# grade (equivalent to ASTM A106 Gr.B in many applications) offers balanced strength and weldability for general pressure and fluid service. The 45# grade delivers higher carbon content, yielding greater tensile strength and hardness — suitable for machined components and high-stress structural applications where fatigue resistance matters. Hot-rolled pipe retains a mill scale surface and is typically supplied oiled for short-term corrosion protection; cold-drawn pipe achieves tighter OD and WT tolerances (±1% versus ±5%) with a smoother finish, at the cost of reduced ductility. For API 5L line pipe applications, the seamless manufacturing process eliminates the weld seam entirely, removing the weakest point under internal pressure and cyclic loading. [NEED_CITE: seamless vs ERW pipe performance under internal pressure]
The Hidden Cost of Unverified Material Sources
Pricing that looks attractive on paper often reflects corners cut elsewhere: steel sourced from non-certified melt shops, wall thickness pushed to the extreme negative tolerance, or MTCs generated without corresponding physical test data. The consequences surface at the worst possible moments — customs holds due to missing certification, on-site weld failures traced to incorrect carbon equivalent, or structural rejection after the pipe has already been cut and fitted. [NEED_CITE: material traceability requirements in international steel procurement] An ASTM A106 API 5L seamless carbon steel pipe supplier that controls the full chain from raw slab to finished, inspected pipe eliminates these gaps by design.
Why Procurement Teams Return to XJY Structure
Our vertical integration means the same facility that produces the raw steel tube also performs cutting, welding, bending, and surface treatment — so every operation stays under one quality system and one point of accountability. The mill maintains over 2,800 specifications in stock, covering the full OD and WT range listed above, which eliminates the typical 4–6 week wait for non-standard sizes. Every heat carries a unique identification number traceable from the melt shop through final packaging, and our internal laboratory issues MTCs conforming to EN 10204 3.1/3.2 format. Third-party inspection agencies are welcomed on-site without restriction. For oversized or heavy-wall shipments, our loading team designs custom lashing plans to prevent transit damage — a detail that matters when a 59 mm WT pipe arrives at site with dented ends and rejected weld preparations.
Documentation & Compliance
- Mill Test Certificate documenting 20# and 45# chemical composition (C, Si, Mn, P, S) and mechanical properties per ASTM A106 or API 5L, issued per heat number
- API certification for API 5L and API 5CT grades, valid for oil and gas pipeline and drilling applications
- ISO 9001 quality management system certificate covering the full production and inspection process
- SGS / BV / Lloyds third-party inspection report available per heat, covering dimensional checks, NDT, and coating thickness
- Material traceability report linking each pipe to its original heat number, melt shop batch, and rolling schedule
- Export documentation package: commercial invoice, packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Oiled seamless pipes bundled with steel strips and protected by edge guards to prevent surface scratching and corrosion during ocean transit
- Beveled-end pipes fitted with plastic caps on both ends to preserve weld preparation geometry through handling and shipping
- Cut-to-length pipes (5.8 m or custom) packed in seaworthy bundles sized for 20ft and 40ft container optimization, maximizing payload per shipment
- Heavy-wall pipes (WT above 20 mm) loaded with custom timber cradles and steel wire lashing to prevent shifting in rough sea conditions
- Each bundle tagged with heat number, steel grade (20# / 45# / API 5L), OD × WT, and length for immediate site identification
- Shipping terms FOB / CIF / DDP available with full export documentation and container tracking until port discharge
Start Your Procurement with Drawings and Specifications
Submit your project drawings (PDF or DWG), required steel grades, OD and WT specifications, applicable standards, and destination port. Our engineering team responds within 24 hours with a detailed quotation covering material, fabrication, coating, packing, and freight — along with a shop drawing timeline and production schedule. For API 5L line pipe or custom cut-to-length requirements, we confirm material availability and third-party inspection scheduling before contract signing.
Frequently Asked Questions
Q: What is the difference between ASTM A106 and API 5L seamless pipe, and which should I specify?
A: ASTM A106 covers seamless carbon steel pipe for high-temperature service in industrial and power applications, while API 5L governs line pipe for oil and gas pipeline transport. The choice depends on your project specification — EPC energy projects typically require API 5L, while boiler and process piping calls for ASTM A106. Both grades (20# and 45#) are available from our mill with full MTC documentation.
Q: Can you provide MTC and third-party inspection (SGS/BV) for each heat?
A: Yes. Every heat receives a Mill Test Certificate documenting chemical composition and mechanical properties per the applicable standard. Third-party inspection through SGS, BV, or Lloyds is available at the buyer’s request and can be scheduled before shipment.
Q: What is the MOQ for custom OD/WT combinations and cut-to-length services?
A: MOQ depends on the specific OD and WT combination and whether the size is held in our 2,800+ specification inventory. Standard sizes have no minimum beyond one bundle. Custom sizes and cut-to-length services are quoted per inquiry based on production scheduling.
Q: How do you ensure material traceability from raw steel to finished pipe?
A: Each pipe carries a unique heat number from our own steel mill through rolling, inspection, and packaging. The MTC links every pipe to its original melt batch, and our internal laboratory maintains full records for audit and third-party verification.
Q: What surface treatment and end finishes are available?
A: Hot-rolled pipes are supplied oiled or non-oiled. End finishes include plain end or beveled per the applicable standard. Additional processing — cutting, welding, bending, and punching — is performed in-house to your drawing specifications.
Request Your ASTM A106 API 5L Seamless Pipe Quotation Today
Send your specifications, drawings, and destination port to receive a detailed quote with mill test certificate confirmation and production timeline.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
