Description
Factory-Direct ERW Round Pipe — Every Q235B ERW welded round steel pipe batch is measured in our in-house lab before leaving Jinan, matching the mill cert to what is actually loaded.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235B ERW Welded Round Steel Pipe |
| Product Type | ERW Welded Steel Pipe (Round) |
| Steel Grade | Q195, Q215, Q235, Q235B, Q345, #20, #45, S275, S275JR, A53, ST37 |
| Standard | ASTM, EN, BS, JIS, API |
| Section Shape | Round |
| Size Range | OD 10 – 3048 mm |
| Wall Thickness | 0.8 – 12.75 mm |
| Length | 1 – 12 m (customizable) |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Cold Rolled / Oiled / Non-oiled / Customized |
| Tolerance | ±1% |
| Ends | Plain / Customized |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Application | Fluid transport, structure pipe, building construction, greenhouse, fence post, machinery |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors & Construction | Building frames, bridge handrails, scaffolding uprights, infrastructure support columns |
| Machinery Manufacturers | Hydraulic cylinders, fluid conveyance lines, conveyor roller shafts |
| Industrial & Agricultural | Greenhouse arches, fence posts, agricultural equipment frames, warehouse racking |
Where Negative Tolerance Turns a Cheap Pipe into an Expensive Rejection
A wall-thickness reading below spec does not just fail an inspector — it halts an entire site pour.
I have watched two containers of 6-meter ERW round pipe sit at Jebel Ali because the third-party inspector pulled a caliper and found minus 8% on wall thickness. The mill cert said one thing; the steel said another. Rework was not an option, and the client’s project timeline absorbed every day of delay. When sourcing a Q235B ERW welded round steel pipe supplier, the gap between paperwork and actual product is where budgets disappear. [NEED_CITE: EN 10219 dimensional tolerance requirements for cold-formed welded hollow sections]
Matching Wall Thickness and Diameter to Structural Load Paths
A Q235B ERW welded round steel pipe in OD 10–3048 mm and WT 0.8–12.75 mm covers everything from thin-wall greenhouse arches to heavy-duty structural columns. The ERW process produces a continuous longitudinal weld seam with a smooth exterior finish, making these pipes suitable for applications where surface quality matters — visible architectural members, conveyor frames, and fluid transport lines alike. Our in-house physical and chemical laboratory tests every heat before shipment, so the tolerance of ±1% is not a catalog claim but a verified measurement.
Engineering Compliance Across EN, ASTM, and JIS Frameworks
Structural projects in Europe require conformity with EN 10210 or EN 10219, while North American EPCs typically specify ASTM A53 or A500. The Q235B grade maps closely to S235JR under EN standards and offers comparable yield behavior for non-critical structural members. For pressure-containing applications, #20 and #45 grades provide higher carbon content suited to machining and moderate-pressure fluid conveyance. Third-party inspection through SGS or BV is arranged on request, and Lloyd’s Register EU CE certification under EN 10210/10219 is available for shipments entering European customs. [NEED_CITE: steel grade equivalence between GB Q series and EN S series structural steels]
Understanding the Q235B Grade and ERW Process
Q235B is a Chinese standard carbon structural steel where “Q” denotes yield strength and “235” indicates the minimum yield value in MPa; the “B” grade specifies room-temperature impact testing. Across international equivalents, S275JR under EN 10025 offers a higher yield tier for load-bearing frames, while ASTM A53 Grade B serves similar structural and fluid applications in North American specifications. The ERW welding process forms the pipe by rolling a steel strip into a cylindrical shape and fusing the seam through electric resistance heating — no filler metal is added, which keeps the weld zone narrow and the dimensional consistency tight. Surface treatment options include cold-rolled finish for a smooth appearance, oiled coating for short-term corrosion protection during transit, or non-oiled for applications where downstream painting or galvanizing is planned. [NEED_CITE: ERW welded pipe manufacturing process and weld seam quality characteristics]
The Hidden Cost of Skipping Mill Verification
Accepting a Q235B ERW welded round steel pipe supplier without verified mill test certificates invites three categories of loss: customs rejection at destination port due to missing or non-conforming EN/ASTM documentation, on-site failure when inspector calipers reveal wall thickness outside tolerance, and project delays when replacement material must be sourced and shipped internationally. Engineering specifications for structural hollow sections reference EN 10219 for cold-formed welded profiles and EN 10210 for hot-finished profiles — both demand traceable chemical composition and mechanical test data by heat number. [NEED_CITE: EN 10219 cold-formed welded structural hollow sections documentation requirements]
Why SD XJY Steel Earns Repeat Orders from EPC Procurement Teams
Every Q235B ERW welded round steel pipe we ship is measured in our own physical and chemical laboratory before it leaves Jinan — the same lab that catches tolerance drift before it becomes a customs problem. We hold 41 invention patents and produce across 2,800+ specifications, meaning non-standard OD or WT combinations do not require you to source from a second supplier. Lloyd’s Register EU CE certification under EN 10210/10219, ISO 9001:2015, and Singapore FPC clear the certification requirements for EU, Southeast Asian, and Middle Eastern projects. Our professional loading team optimizes container stowage for round pipes across the full 1–12 m length range, reducing freight cost per ton. Exports to 50+ countries include handling the full documentation package — mill certificates, packing lists, bills of lading, and certificates of origin — so your customs broker receives a complete set on day one.
Documentation & Compliance
- Mill Test Certificate documenting Q235B chemical composition and mechanical properties per GB/T 700, with heat number traceability
- Lloyd’s Register EU CE certificate conforming to EN 10210/EN 10219 for European market customs clearance
- ISO 9001:2015 quality management system certificate covering the full ERW welded round pipe production line
- SGS or BV third-party inspection report available for independent verification of dimensional tolerance and surface quality
- Material traceability by heat number linking each pipe to its original steel coil and production batch record
- Complete customs document package: packing list, bill of lading, certificate of origin, and commercial invoice
Packaging, Loading & Delivery
- ERW welded round pipes bundled with steel strips and edge protectors to prevent surface damage to the cold-rolled or oiled finish during ocean transit
- Oiled surface treatment applied before bundling to provide short-term corrosion protection for Q235B and S275JR grades during extended sea freight
- Container loading optimized for OD 10–3048 mm round sections, with nested smaller diameters inside larger pipes to maximize payload per 20ft or 40ft container
- Custom cutting to site-specific lengths within the 1–12 m range, reducing on-site waste and welding joints for scaffolding and greenhouse applications
- Heat number and steel grade stenciled on each pipe end for immediate site identification and traceability verification by inspectors
- FOB, CIF, and DDP shipping terms available with door-to-door logistics coordination to ports across the EU, Middle East, Southeast Asia, and North America
Request a Quote with Mill Test Documentation
Submit your specification sheet — OD, wall thickness, length, steel grade, and destination port — and receive a detailed quotation including unit price, production lead time, applicable certifications, and a sample mill test certificate for Q235B within 12 hours. For non-standard dimensions outside the 10–3048 mm OD range, our engineering team will confirm feasibility and tooling requirements before you commit to a deposit.
Get Your Q235B ERW Round Pipe Quote and Mill Cert
Send your specifications via email or WhatsApp to receive pricing, certification details, and a sample mill test certificate.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjysteel.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
Frequently Asked Questions
Q: How does Q235B compare to S275JR and ASTM A53 across international standards?
A: Q235B is a Chinese GB/T 700 carbon structural steel with minimum yield strength of 235 MPa. It maps closely to S235JR under EN 10025 for European structural applications. ASTM A53 Grade B serves a similar role in North American specifications for structural and fluid conveyance use. For higher load requirements, S275JR offers increased yield strength under EN standards. We supply all these grades from the same ERW welded round pipe production line, with mill test certificates clearly identifying the grade and standard for each shipment.
Q: Can you provide mill test certificates and arrange third-party inspection?
A: Yes. Every shipment of Q235B ERW welded round steel pipe includes an original mill test certificate documenting chemical composition and mechanical properties by heat number. Third-party inspection through SGS or BV can be arranged before shipment for independent verification of wall thickness, OD tolerance, and surface quality. Lloyd’s Register EU CE certification under EN 10210/10219 is also available for projects requiring European market compliance.
Q: What is the MOQ for non-standard sizes and custom lengths?
A: The standard MOQ is 1 Ton. For non-standard outer diameters or wall thicknesses outside the regular 10–3048 mm OD and 0.8–12.75 mm WT range, we will confirm tooling availability and minimum quantity based on your specific requirements. Custom lengths within the 1–12 m range are available with no additional MOQ increase for standard sizes.
Q: What surface treatment options are available for ERW round pipes?
A: We offer cold-rolled finish for a smooth surface suitable for visible architectural applications, oiled coating for short-term corrosion protection during storage and transit, and non-oiled finish for projects where downstream galvanizing or painting is planned. For long-term corrosion resistance in outdoor or marine environments, hot-dip galvanizing or 3PE coating can be arranged as a secondary processing service.
Q: Do your CE certificates comply with EN 10210/10219 for European customs?
A: Yes. Our Lloyd’s Register EU CE certification covers EN 10210 for hot-finished structural hollow sections and EN 10219 for cold-formed welded hollow sections. This certification is recognized at EU customs and satisfies the declaration of performance requirements for structural steel products entering the European market. The CE certificate, along with the mill test certificate and certificate of origin, is included in the standard documentation package for every European shipment.
