Description
Factory-Direct Welded Pipe Supply — Full inventory of SS400 and S235JR welded circular steel pipes in OD 10–1000mm, shipped directly from our Jinan production lines with original mill test certificates on every order.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | SS400 / S235JR Welded Circular Steel Pipe |
| Product Type | Welded Steel Pipe / Circular Steel Pipe |
| Steel Grade | SS400, S235JR, S235GR2, Q195, Q235A-B, Q345A-E, ASTM A53, ASTM A36, ASTM A500, ASTM A106, St37, St52, S355TRH |
| Standard | GB/T 3091-2001, GB/T 13912-2002, BS 1387, ASTM F1083, ASTM A53, ASTM A500, ASTM A106 |
| Section Shape | Round |
| Size Range | OD 10–1000 mm |
| Wall Thickness | 1–80 mm |
| Length | 1–12 m |
| Technique | Hot Rolled / Welded |
| Surface Treatment | Black Painting / Oiled / Non-oiled |
| Tolerance | ±1% |
| Ends | Plain / Beveled per requirement |
| Application | Fluid delivery, construction, structural, machinery, boiler, hydraulic, oil and chemical pipelines |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, fence posts, greenhouse structures, curtain wall supports |
| Fluid & Energy Transport | Water supply lines, gas distribution, pump well casing, oil pipelines |
| Machinery & Industrial Equipment | Boiler tubes, drill pipes, hydraulic cylinders, conveyor rollers |
| Agricultural Structures | Greenhouse framing, irrigation pipe networks, equipment support posts |
What Negative Tolerance Costs on a Welded Circular Steel Pipe Order
A wall thickness that passes on paper but fails SGS inspection at the destination port turns a profitable shipment into a loss.
I watched an entire container of welded circular steel pipe sit at Apapa port for two weeks because the wall thickness negative tolerance hit the critical line. The client’s SGS re-inspection flagged it. Rework and reshipment ate every cent of margin. Since then, I check tolerance specs before I check price. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
When procurement teams source SS400 S235JR welded circular steel pipe from multiple suppliers without verified mill certificates, the risk compounds. One batch arrives with incomplete chemical composition reports. Another has surface treatment that doesn’t match the order. Customs holds the cargo. The project timeline slips. These are not hypothetical scenarios — they happen on real projects across West Africa, Southeast Asia, and South America every quarter.
How Diameter and Thickness Range Serve Structural and Fluid Applications
The OD 10–1000mm and WT 1–80mm range covers everything from small-bore hydraulic lines to large-diameter structural columns. For greenhouse framing and fence posts, the lower diameter range with standard wall thickness provides adequate load-bearing capacity at minimal material cost. When the same SS400 S235JR welded circular steel pipe moves into fluid transport — water mains, gas distribution, pump well casing — the thicker wall options handle internal pressure while the welded seam maintains structural continuity. Our production lines run all three size segments simultaneously, so a single order can consolidate structural pipes and fluid pipes into one container without splitting shipments across different factories.
Engineering Compliance and Certification Requirements
Structural applications in the EU require CE certification under EN 10210 or EN 10219, and customs authorities at major ports increasingly request these documents before release. [NEED_CITE: CE marking requirements for structural hollow sections under EN 10210] For North American projects, ASTM A53 and ASTM A500 compliance determines whether the pipe passes engineering specification review. The SS400 and S235JR grades meet JIS G3466 and EN 10025 equivalence respectively, but the mill test certificate must explicitly document chemical composition and mechanical properties per the target standard. Our in-house lab conducts three-stage inspection on every batch, and SGS or BV third-party inspection is available for projects requiring independent verification. Custom lengths up to 12m reduce on-site welding joints, and beveled ends arrive ready for field connection.
Steel Grade Selection and Welding Process Fundamentals
SS400, S235JR, and Q235 represent equivalent yield strength tiers across Japanese, European, and Chinese standards — all suitable for general structural and low-pressure fluid applications. [NEED_CITE: steel grade equivalence between JIS SS400, EN S235JR, and GB Q235] When the design calls for higher load capacity, Q345 and S355TRH provide increased yield strength for heavier structural frames and pressure-containing applications. The welded manufacturing process creates a longitudinal seam that, when properly controlled, delivers consistent mechanical properties across the full cross-section. Surface treatment selection depends on the operating environment: black painting suits indoor structural use, oiled finish provides temporary corrosion protection during transit and storage, and non-oiled condition works for applications requiring subsequent galvanizing or coating. The ±1% tolerance on wall thickness ensures that theoretical weight calculations match actual delivered weight, preventing cost overruns on tonnage-based contracts.
Hidden Costs of Incorrect Grade or Missing Certification
Ordering SS400 when the engineering spec calls for S355TRH means the pipe fails load testing and requires complete replacement — not just a discount negotiation. Missing mill test certificates cause customs delays that can stretch into weeks, with demurrage charges accumulating daily. [NEED_CITE: customs documentation requirements for steel pipe imports] Negative tolerance that exceeds the standard limit reduces actual load-bearing capacity below design requirements, creating structural safety risks that only surface during inspection or, worse, during service. The cost of getting it right upfront — verified grade, complete documentation, controlled tolerance — is always lower than the cost of failure at the destination.
Why Procurement Teams Source Welded Circular Steel Pipe From Us
We operate three production lines in Jinan running simultaneously, producing over 20,000 tons monthly across all major steel product categories. Every batch of SS400 S235JR welded circular steel pipe ships with original mill test certificates documenting chemical composition and mechanical properties. Our inventory covers 2,800+ specifications, so standard sizes ship immediately while custom orders complete within typical production lead times. Factory-direct pricing eliminates middleman markups, and volume discount programs reward long-term procurement partnerships. We handle consolidated multi-product container loading — combining welded pipes with plates, beams, and fabrication in one shipment — reducing logistics coordination from multiple suppliers to a single point of contact. Professional export documentation and customs clearance support prevent port delays, and dedicated account managers provide ongoing order tracking and after-sales service.
Documentation & Compliance
- Mill test certificate documenting SS400 and S235JR chemical composition, yield strength, and tensile properties per GB/T 3091 and ASTM A53
- CE certificate covering EN 10210 and EN 10219 compliance for structural hollow sections exported to European markets
- ISO 9001:2015 quality management certification covering full production and inspection processes
- SGS or BV third-party inspection report available upon request for projects requiring independent quality verification
- Material traceability by heat number linking each pipe to its production batch and test results
- Complete customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Black painted welded circular steel pipes bundled with steel strips and edge protectors to prevent surface damage during ocean transit
- Oiled finish pipes wrapped in waterproof paper to maintain corrosion protection through humidity and salt air exposure
- Container loading optimized for OD 10–1000mm diameter range, maximizing cubic utilization across mixed-size shipments
- Custom cutting to 1–12m lengths reduces on-site welding requirements and minimizes material waste at the project location
- Heat number and steel grade markings stenciled on each pipe for site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with professional logistics coordination from Jinan to destination port
Start Your Welded Circular Steel Pipe Inquiry
Submit your specifications — diameter, wall thickness, steel grade, quantity, and destination port — and receive a competitive bulk quotation within 12 hours. Request mill test certificates and third-party inspection options upfront to confirm compliance before production begins. Our export team handles documentation, container loading optimization, and customs clearance to ensure on-time delivery.
Request Factory-Direct Pricing and Mill Test Certificates
Send your SS400 S235JR welded circular steel pipe requirements via email or WhatsApp for immediate quotation and technical documentation.
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxinjiyuan.com
