Description
Factory-Direct Mill Supply — Every ASTM A106 Grade B and API 5CT N80 pipe ships with in-house lab test reports and full heat-level traceability, cutting out trading margins.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A106 Grade B / API 5CT N80 Carbon Seamless Steel Pipe |
| Product Type | Seamless Steel Pipe |
| Steel Grade | ASTM A106 Grade B, API 5CT N80 |
| Standard | ASTM A106, API 5CT, JIS, ISO 9001 |
| Section Shape | Round |
| Size Range | Wall Thickness 2–70 mm |
| Length | 6 m / 6.4 m / 12 m (Customer’s Request) |
| Technique | Seamless (Hot Rolled / Cold Rolled) |
| Surface Treatment | Slightly Oiled |
| Tolerance | ±1% |
| Ends | Plain / Beveled / Threaded (Welding, Punching, Cutting, Bending) |
| Application | Oil drilling, Fluid transport, Boiler, Gas pipeline, Hydraulic system, Chemical fertilizer industry, Structural application |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas Extraction | Casing, tubing, and drill pipe for onshore and offshore drilling operations |
| Power Generation | High-temperature boiler tubes and superheater pipelines |
| Petrochemical Processing | Pressure-rated process piping for chemical fertilizer and refinery plants |
| Industrial Fluid Transport | Hydraulic systems and high-pressure gas transmission lines |
| Structural Engineering | Load-bearing columns and mechanical fabrication components |
Where Certification Gaps Turn a Seamless Pipe Order into a Port Detention
Paper-clean mill certificates mean nothing if the heat number does not match the physical pipe on the dock.
I watched a 30-inch casing shipment get held at Jebel Ali because wall thickness on multiple joints fell below API tolerance — despite spotless third-party paperwork. The entire batch was detained, delaying an offshore drilling schedule by two weeks. When procurement teams source ASTM A106 Grade B API 5CT N80 carbon seamless steel pipe supplier orders from fragmented channels, they inherit exactly this risk: inconsistent material traceability, missing chemical composition data, and no independent lab verification before loading. [NEED_CITE: API 5CT casing and tubing inspection requirements]
Matching Wall Thickness and Steel Grade to Downhole Pressure Environments
Oil drilling casing and tubing face extreme internal pressure, corrosive H₂S exposure, and cyclic thermal loading. API 5CT N80 delivers the higher yield strength required for deep well casing, while ASTM A106 Grade B serves high-temperature boiler and fluid transport lines where sustained heat resistance matters more than ultimate tensile capacity. Our hot-rolled and cold-rolled ASTM A106 Grade B API 5CT N80 carbon seamless steel pipe supplier production covers 2–70 mm wall thickness with ±1% tolerance, allowing engineers to spec precisely for pressure rating without over-ordering weight.
Engineering Compliance and Site Processing Requirements
Seamless carbon pipes for pressure service must conform to ASTM A106 for high-temperature applications and API 5CT for oilfield casing — each standard governs different chemical composition limits and mechanical test frequencies. [NEED_CITE: ASTM A106 high-temperature service material requirements] End finishing — plain, beveled, or threaded — must match the field joining method, whether API buttress thread for casing or bevel-prep for butt-welded process lines. Our in-house cutting, punching, and bending services deliver ready-to-install lengths of 6 m, 6.4 m, or 12 m, reducing secondary fabrication at the rig site or pipe rack.
Hot Rolled vs. Cold Rolled: Dimensional Accuracy and Cost Trade-offs
Hot-rolled seamless pipes suit standard pressure applications where nominal wall thickness and general dimensional tolerance are acceptable — the process offers lower cost and longer single-length availability. Cold-rolled seamless pipes achieve tighter outer diameter and wall thickness control, critical for hydraulic systems and precision mechanical applications where ±1% tolerance must hold across every meter. Both processes start from solid billet piercing, eliminating the weld seam that becomes a failure point under cyclic pressure in oil drilling and boiler service. The slightly oiled surface treatment provides short-term corrosion protection during ocean transit without interfering with field welding or NDT inspection.
The Hidden Cost of Specifying the Wrong Grade or Accepting Negative Tolerance Abuse
Ordering API 5CT N80 but receiving material that tests as lower-grade J55 creates a catastrophic mismatch — the pipe may pass visual inspection but fail under downhole pressure, triggering well control incidents and regulatory investigation. Similarly, wall thickness that drifts beyond the −12.5% allowance permitted by ASTM A106 reduces burst pressure capacity and voids engineering sign-off. [NEED_CITE: ASTM A106 dimensional tolerance and wall thickness allowance] Customs authorities in the EU and Middle East routinely detain seamless pipe shipments lacking proper MTC traceability or third-party inspection stamps, turning a cost-saving purchase into weeks of demurrage and re-export expense.
Why Engineering Procurement Teams Consolidate Seamless Pipe Orders Here
Our mill operates three dedicated seamless pipe production lines with in-house physical and chemical laboratories — every heat undergoes incoming billet inspection, in-process dimensional checks, and final mechanical testing before release. We hold ISO 9001:2015 certification and supply state-owned energy contractors across 50+ countries, meaning our ASTM A106 Grade B API 5CT N80 carbon seamless steel pipe supplier documentation meets the audit requirements of international EPC projects. Custom non-standard lengths and wall thicknesses are available against MOQ of just 1 Ton, and our professional loading team optimizes container stowage for heavy seamless pipe — a capability that prevents transit damage and reduces freight cost per ton.
Documentation & Compliance
- Mill Test Certificate documenting ASTM A106 Grade B and API 5CT N80 chemical composition (C, Mn, Si, S, P) and mechanical properties per heat number
- API 5CT certification confirming N80 grade compliance for oilfield casing and tubing applications
- ISO 9001:2015 quality management system certificate covering the full seamless pipe production process
- SGS or BV third-party inspection report available upon request for pre-shipment verification
- Material traceability report linking each pipe to its heat number, billet batch, and test results
- Customs documentation package including packing list, Bill of Lading, and Certificate of Origin
Packaging, Loading & Delivery
- Slightly oiled ASTM A106 Grade B and API 5CT N80 pipes bundled with steel strips and edge protectors to preserve surface treatment during ocean transit
- Seamless pipes in 2–70 mm wall thickness range loaded with optimized container stowage plans to maximize payload and prevent shifting
- Custom cut-to-length service available for 6 m, 6.4 m, and 12 m requirements, with length tolerance marked on each pipe end
- Heat number, steel grade, and standard clearly stenciled on every pipe for site traceability and inspection verification
- FOB, CIF, and DDP shipping terms supported with professional port coordination at Qingdao and other major Chinese ports
- Door-to-door logistics coordination for project sites across the Middle East, Southeast Asia, and Africa
Start Your ASTM A106 Grade B API 5CT N80 Carbon Seamless Steel Pipe Supplier Inquiry
Submit your required steel grade, wall thickness, length, quantity, and destination port — our team responds within 12 hours with a detailed quotation including unit price, production lead time, payment terms, and applicable certification scope. Request material samples and original Mill Test Certificates before committing to production, and confirm end finishing, surface treatment, and third-party inspection requirements in your initial inquiry.
Request Factory-Direct Pricing and Mill Test Certificates
Send your specifications to admin@sdxjysteel.com or reach us via WhatsApp at +86 188 5315 7756 for a detailed quotation and certification package within 12 hours.
