Description
Factory-direct ERW round pipe supply — Q235 and Q345 grades rolled in-house with full API and JIS mill test certificates, shipped without broker markups.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235/Q345 ERW Round Steel Pipe |
| Product Type | ERW Round Steel Pipe |
| Steel Grade | Q195, Q235, Q345, S235JR, S275JR, S355JR |
| Standard | JIS, API |
| Section Shape | Round |
| Outer Diameter | 9 inch (approx. 219.1 mm) |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Cold Rolled / Black Painted |
| Tolerance | ±1% |
| Length | 1–12 m |
| Ends | Plain (default) |
| Application | Fluid Pipe, Boiler Pipe, Drill Pipe, Hydraulic Pipe, Gas Pipe, Oil Pipe, Chemical Fertilizer Pipe, Structure Pipe, EMT Pipe |
| MOQ | 20 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Transmission pipelines, wellhead casing, gas distribution networks |
| Industrial Manufacturing | Hydraulic cylinder barrels, conveyor roller tubes, drilling equipment frames |
| EPC & Infrastructure | Structural columns, pipe rack supports, bridge handrail posts |
| Chemical & Fertilizer | Process piping, fertilizer plant conveyance lines, boiler feed tubes |
Where Missing Mill Certificates Stall Customs for an API ASTM ERW round steel pipe supplier
A heat number without traceable chemistry is a container stuck at the port.
Procurement teams ordering fluid or structural pipe for EU or Middle East projects routinely face customs holds when mill test certificates lack EN 10204 3.1 formatting or omit chemical composition per heat. I have watched full 40HC loads of 9 inch ERW pipe sit in Jebel Ali for eleven days because the supplier’s MTC listed only “equivalent grade” without actual test values. [NEED_CITE: EN 10204 inspection document types for metallic products] Beyond customs, engineers cannot sign off on structural frames without verified yield and tensile data tied to the specific heat. Fragmented sourcing across multiple mills multiplies this risk — each batch arrives with a different certificate format, and the site inspector rejects the lot.
Matching 9 Inch ERW Pipe to Structural and Fluid Conveyance Demands
A 219.1 mm OD ERW round pipe in Q345 or S355JR serves load-bearing columns and hydraulic lines where wall-thickness consistency directly affects weld fit-up. The ±1% tolerance on this API ASTM ERW round steel pipe supplier product keeps bevel preparation predictable across 12 m lengths, reducing on-site rework. Cold-rolled black painted finish provides baseline corrosion protection for indoor structural frames while remaining weldable without surface grinding. Our in-house lab tests every heat for chemical composition and mechanical behavior before the pipe leaves the mill, so the MTC you receive matches the steel on the truck.
Engineering Compliance and Certification Pathways
Structural applications under EN 1993 or AISC require documented conformity — the API ASTM ERW round steel pipe supplier must provide certificates that reference the specific standard the project engineer specified. For EU-bound orders, CE marking under EN 10210 or EN 10219 is non-negotiable; for North American EPC projects, API 5L or ASTM A53 equivalence must be stated on the MTC. [NEED_CITE: structural hollow section compliance EN 10210 vs ASTM A500] Corrosion environments dictate surface treatment: black painted suits dry indoor structures, while offshore or chemical plant orders may require additional external coating. Plain ends arrive ready for site welding, but our cutting and punching services deliver pre-fabricated lengths that reduce yard work.
Steel Grade Selection and ERW Process Fundamentals
Q235 and Q345 belong to the Chinese GB/T 700 and GB/T 1591 system, roughly corresponding to S235JR and S355JR in the EN framework — the S-series grades carry guaranteed impact energy at sub-zero temperatures, which matters for cold-climate structural work. ERW welding forms the longitudinal seam by passing current through the heated strip edges under pressure, producing a weld zone that is narrower and more consistent than SSAW spiral seams on the same diameter. [NEED_CITE: ERW versus seamless pipe manufacturing process comparison] Cold rolling after forming tightens the outer diameter tolerance to ±1%, which is critical when the pipe must slide into a sleeve or mate with a flanged connection. Black paint applied over the cold-rolled surface adds a thin barrier against handling corrosion during transit without interfering with subsequent welding or coating. Wall thickness tolerance directly affects theoretical weight: a pipe rolled to the negative edge of the standard saves material cost but reduces the safety margin the structural engineer calculated.
The Hidden Cost of Tolerance Drift and Certificate Gaps
Ordering Q345 ERW pipe that arrives with actual wall thickness below the specified tolerance means the structural frame carries less load than the engineer designed for — a failure that surfaces only during load testing or, worse, under service conditions. Missing or non-conforming MTCs trigger customs rejection in the EU and GCC, where import authorities cross-check heat numbers against submitted certificates. [NEED_CITE: customs documentation requirements for steel pipe imports] Replacing a rejected container costs freight, duties, and weeks of delay — far more than the per-ton savings from choosing an unverified supplier.
Why Procurement Teams Source This API ASTM ERW round steel pipe supplier From Us
We roll Q235 and Q345 ERW round pipe on dedicated lines with in-line ultrasonic weld inspection, and our physical and chemical lab tests every heat before release — the MTC you receive is generated from actual test data, not a template. Our catalog covers over 2,800 specifications, so a project needing 9 inch round pipe alongside rectangular hollow sections and H-beams sources from a single mill, cutting coordination overhead. We hold CE certification under EN 10210 and EN 10219, ISO 9001:2015, and Singapore FPC, with SGS and BV third-party inspection available on request. Custom lengths from 1 to 12 m, plus cutting, punching, and bending services, arrive pre-processed to your drawing. Professional loading plans optimize container fill for 9 inch OD pipe, and we handle FOB, CIF, and DDP shipments to over 50 countries with full documentation packages.
Documentation & Compliance
- Mill test certificate documenting Q235 and Q345 chemical composition, yield strength, and tensile properties per heat number, formatted to EN 10204 3.1
- CE certificate covering EN 10210 hot-finished and EN 10219 cold-formed hollow sections for EU project compliance
- ISO 9001:2015 quality management certificate covering the full ERW pipe production process
- SGS or BV third-party inspection report available for pre-shipment verification of dimensions, surface, and mechanical properties
- Material traceability linking each pipe to its heat number, with stamping on the outer surface
- Full customs documentation set including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Q235 and Q345 ERW round pipes bundled with steel strips and edge protectors to prevent surface damage to the cold-rolled black painted finish during ocean transit
- 9 inch OD pipes loaded in nested or cradled arrangements to maximize 40HC container fill and minimize movement
- Plain ends capped with plastic protectors to keep debris out of the bore before site welding
- Custom cut lengths from 1 to 12 m bundled separately with heat number and steel grade stenciled on each bundle
- FOB Jinan or Qingdao port, with CIF and DDP options to EU, North America, Middle East, and Southeast Asia destinations
- Full documentation pack sealed in waterproof envelope and attached to the container door
Request a Quote With Full Mill Test Documentation
Submit your specification sheet — OD, wall thickness, length, steel grade, quantity, and destination port — and receive a detailed quotation with delivery timeline and applicable certification within twelve hours. We will include a sample MTC format for your engineer’s review and confirm third-party inspection availability if required.
Get Your API ASTM ERW Round Pipe Quotation
Send your requirements to admin@sdxjysteel.com or reach us on WhatsApp at +86 188 5315 7756 for pricing, mill test certificates, and loading plans.
Frequently Asked Questions
Q: What is the difference between API and JIS standards for ERW round pipes?
A: API standards such as API 5L focus on line pipe for oil and gas transmission, specifying requirements for pressure containment and weld integrity. JIS G3466 and JIS G3452 cover general structural and ordinary piping applications with dimensional and chemical requirements. We produce to both standards and clearly mark the applicable specification on the mill test certificate.
Q: Can you provide third-party inspection reports for customs clearance?
A: Yes. SGS and BV third-party inspection is available for pre-shipment verification of dimensions, surface quality, wall thickness, and mechanical properties. The inspection report is issued independently and accepted by customs authorities in the EU, Middle East, and Southeast Asia.
Q: What is the MOQ for custom lengths and non-standard diameters?
A: The standard MOQ is 20 tons. Custom lengths within the 1–12 m range and non-standard diameters are available subject to production scheduling. Please submit your full specification for a tailored quotation.
Q: How do you ensure consistent wall thickness tolerance across batches?
A: Our ERW production lines use in-line ultrasonic measurement and our in-house physical lab conducts dimensional checks on every heat. The ±1% tolerance on OD and wall thickness is verified before the pipe is released for packaging.
Q: Do you offer DDP shipping to EU and North America with full documentation?
A: Yes. We handle FOB, CIF, and DDP shipments to over 50 countries. The documentation package includes the mill test certificate, packing list, bill of lading, certificate of origin, and CE certificate where required for EU delivery.
