Description
Factory-Direct ERW Round Steel Pipe — Every Q235 ERW round steel pipe rolls off our own production lines in Jinan, shipped with in-house lab data and full mill traceability, no trading markup.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 ERW Round Steel Pipe |
| Product Type | Round Steel Pipe (ERW Welded) |
| Steel Grade | Q195, Q235, Q345, S235JR, S275JR, S355JR |
| Standard | JIS, API, CE, ISO 9001 |
| Section Shape | Round |
| Outer Diameter | Customization |
| Wall Thickness | Customization |
| Length | 1–12 m (standard 6 m / 6.4 m / 12 m) |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Cold Rolled, Black Painted |
| Tolerance | ±1% |
| Ends | Plain (default) |
| Oiled or Non-oiled | Non-oiled |
| Invoicing | By Theoretical Weight |
| Application | Fluid Pipe, Boiler Pipe, Drill Pipe, Hydraulic Pipe, Gas Pipe, Oil Pipe, Chemical Fertilizer Pipe, Structure Pipe |
| MOQ | 20 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors | Structural columns and truss members for industrial plant frames |
| Construction Companies | Scaffolding uprights, handrail posts, and building support frames |
| Machinery Manufacturers | Conveyor roller shafts, hydraulic cylinder housings, equipment bases |
| Petrochemical & Energy | Gas distribution lines, chemical fertilizer feed pipes, low-pressure oil transport |
| Infrastructure Developers | Bridge parapet railings, drainage culvert supports, utility pole foundations |
What Missing Mill Test Certificates Cost on a JIS-Grade Pipe Order
A rejected container at destination port costs more than the pipe itself.
Buyers sourcing ERW round steel pipe supplier JIS standard products from fragmented suppliers often discover too late that the mill test certificate does not match the heat number stamped on the pipe, or that the declared steel grade was never verified by an independent lab. We have seen entire shipments held at customs because the CE documentation listed a different standard than what the project engineer specified. When wall thickness tolerance drifts beyond ±1%, the theoretical weight invoiced no longer reflects what actually arrives on site — and the project absorbs the loss. [NEED_CITE: EN 10219 dimensional tolerance requirements for cold-formed hollow sections]
Matching Wall Thickness and Length to Structural Load Paths
Every Q235 ERW round steel pipe we produce is sized to the exact outer diameter and wall thickness your structural engineer specifies, cut to the定尺 length that minimizes on-site welding joints. For conveyor structures and scaffolding frames, the ±1% tolerance ensures that connection plates and gussets fit without field reaming. Our in-house physical and chemical laboratory tests every heat before the pipe leaves the mill, so the Q235 or S235JR grade you ordered is the grade that ships — verified by chemistry and mechanical data, not just a label.
Engineering Compliance and Certification Alignment
Structural frames designed to EN 1993 require hollow sections that conform to EN 10210 or EN 10219, and EU customs will not clear the shipment without a valid CE certificate referencing the correct standard. For projects in Southeast Asia and the Middle East, JIS G3466 and API specifications govern fluid and gas transport lines, and the mill test certificate must explicitly state compliance. We produce Q235 ERW round steel pipe to JIS, API, and CE standards simultaneously across our lines, so a single order can serve mixed-destination projects without splitting procurement. The black painted or cold rolled surface arrives non-oiled and ready for field coating or direct welding. [NEED_CITE: steel grade equivalence mapping between GB/T, JIS, and EN standards]
Steel Grade Selection and ERW Weld Integrity
Q195, Q235, and Q345 represent the Chinese GB/T carbon structural steel series, where the number indicates the minimum yield strength in MPa — Q235 delivers sufficient strength for most structural and low-pressure fluid applications at a lower cost than seamless alternatives. S235JR, S275JR, and S355JR are the European EN equivalents, with the “JR” suffix confirming room-temperature impact toughness. ERW welding produces a longitudinal seam with uniform grain structure across the weld zone, making it suitable for pressures and diameters where seamless pipe offers no structural advantage. The cold rolled surface finish provides a smooth exterior for aesthetic applications or further coating, while black painted protection prevents transit corrosion without interfering with subsequent galvanizing or 3PE wrapping. Wall thickness tolerance held at ±1% means the actual load-bearing cross-section matches the engineer’s calculation — a margin that matters when negative tolerance drifts accumulate across hundreds of tons. [NEED_CITE: ERW versus seamless pipe application range and pressure rating comparison]
The Hidden Price of Tolerance Drift and Grade Substitution
Ordering Q235 ERW round steel pipe at a price that seems too good often means the supplier is shipping material at the lower edge of negative tolerance — or substituting Q195 and calling it Q235. The project does not discover this until the third-party inspector arrives, the structural engineer rejects the batch, or the pipe fails a hydrostatic test at the commissioning stage. Rework, delay penalties, and air-freight replacement costs dwarf the original unit price saving. We control tolerance at the rolling stage, not the inspection stage, because our理化 lab measures every coil before it enters the ERW line. [NEED_CITE: consequences of negative tolerance excess in structural steel procurement]
Why Engineering Procurement Teams Source ERW Round Steel Pipe Here
Our Jinan facility operates three dedicated ERW and forming lines covering over 2,800 specifications in round, square, and rectangular profiles — meaning your Q235 ERW round steel pipe rolls on the same floor as your S355JR structural tube, under one quality system. Every heat is tested in our own physical and chemical laboratory before welding begins, and the mill test certificate travels with the shipment, not as an afterthought. We hold CE certification under EN 10210 and EN 10219, ISO 9001:2015 registration, and factory production control approval from Lloyd’s Register — documents that EU and Singapore port authorities accept without additional notarization. Custom outer diameter, non-standard wall thickness, and cut-to-length up to 12 m are standard practice, not special orders. Our loading team plans every container to maximize payload while protecting the black painted surface from transit damage, and we coordinate FOB, CIF, and DDP shipments to over 50 countries with real-time tracking.
Documentation & Compliance
- Mill test certificate documenting Q235 chemical composition and yield strength per JIS G3466, linked to the heat number stamped on each pipe end
- CE certificate of conformity under EN 10210 and EN 10219 for structural hollow sections destined for EU member states
- ISO 9001:2015 quality management system certificate covering the full ERW production and inspection process
- SGS or BV third-party inspection report available upon request, covering dimensional check, visual weld inspection, and chemistry verification
- Full material traceability from steel coil heat number through ERW welding, cutting, and final bundling
- Customs document package including packing list, ocean bill of lading, and certificate of origin formatted for the destination port
Packaging, Loading & Delivery
- Black painted Q235 ERW round steel pipes bundled with steel strips and edge protectors to prevent coating abrasion during ocean transit
- Non-oiled surface finish allows direct welding or field coating upon arrival, with no degreasing required before fabrication
- Container loading plan optimized for 6 m and 12 m定尺 lengths to maximize payload per 20-foot and 40-foot high-cube unit
- Heat number and steel grade stenciled on each pipe end for on-site traceability and third-party inspection verification
- FOB Jinan/Qingdao, CIF destination port, or DDP door-to-door delivery coordinated with forwarders experienced in heavy steel cargo
- Cut-to-length service available for 1–12 m requirements, reducing on-site cutting waste for scaffolding and structural frame projects
Getting Your Q235 ERW Round Steel Pipe Quotation Started
Send your outer diameter, wall thickness, length, steel grade, and destination port — we return a detailed quotation within 12 hours, including unit price, production lead time, applicable certification, and mill test certificate scope. For non-standard dimensions or mixed-grade orders, we provide a custom fabrication plan before you commit to a deposit.
Request Factory-Direct Pricing and Mill Test Certificate
Submit your specification sheet via email or WhatsApp to receive a quotation with full documentation scope and container loading plan.
Contact Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile / WhatsApp / WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
Website: www.sdxjysteel.com
