Description
Factory-direct ERW pipe supply — We roll and ship Q235 ERW welded steel pipe from our own mill inventory, cutting out trading margins on orders from 5 tons upward.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 ERW Welded Steel Pipe |
| Product Type | ERW Welded Steel Pipe |
| Steel Grade | Q195, Q235, Q355, 10#, 20#, 45#, 16Mn, A53, A36, ST35, ST52, S355 |
| Standard | API 5L, ASTM A53, ASTM A252, ASTM A671, ASTM A450, ASME B36.10M, BS EN10219, BS EN10296, GB/T 3091, GB/T 13793, GB/T 9711 |
| Section Shape | Round |
| Size Range | Outer Diameter 6 – 1820 mm |
| Wall Thickness | Cold rolled 1 – 4.0 mm / Hot rolled 4 – 20 mm |
| Length | 1 – 12 m |
| Technique | ERW (Electric Resistance Welded) / Hot Rolled Based |
| Surface Treatment | Hot Rolled / Slightly Oiled |
| Tolerance | ±1% |
| Ends | Plain / Beveled (per customer requirement) |
| Application | Fluid transport, Boiler, Gas pipeline, Oil pipeline, Hydraulic systems, Chemical fertilizer industry, Construction, Machinery, Building industry |
| MOQ | 5 Tons |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas Pipeline | Low-pressure gas distribution lines, crude oil gathering pipelines, API 5L compliant transport systems |
| Construction & Building | Structural columns, scaffolding uprights, purlin supports, building frame bracing |
| Boiler & Pressure Systems | Feedwater lines, low-pressure steam conduits, heat exchanger shells |
| Machinery & Equipment | Hydraulic cylinder barrels, conveyor roller tubes, machine frame members |
| Chemical Fertilizer | Process fluid transfer lines, cooling water circuits, slurry transport pipes |
When Wall-Thickness Tolerance Decides Whether Your Pipeline Passes Inspection
A ±1% tolerance on Q235 ERW welded steel pipe means the difference between passing hydrostatic test and ripping out 200 meters of installed line.
Procurement teams routinely discover — after the pipe reaches site — that wall thickness deviates beyond acceptable limits, causing weld joint misalignment and hydrostatic test failures. Missing mill test certificates compound the problem: without traceable heat numbers, inspectors reject the entire batch regardless of actual material quality. [NEED_CITE: ERW pipe wall thickness tolerance standards for pressure applications]
Matching OD Range and Wall Thickness to Pipeline Pressure Requirements
Our Q235 ERW welded steel pipe covers outer diameters from 6 mm to 1820 mm, letting you source both small-bore instrument lines and large-diameter transmission pipes from a single purchase order. The cold-rolled wall range (1–4.0 mm) serves low-pressure fluid transfer and structural applications, while hot-rolled walls (4–20 mm) handle higher-pressure gas and oil pipeline duties. We supply slightly oiled surface treatment as standard, protecting the pipe during ocean transit without interfering with field welding or coating application.
Engineering Compliance and Certification Pathways
Q235 ERW welded steel pipe manufactured to GB/T 3091 and GB/T 9711 meets Chinese structural and pipeline standards, while ASTM A53 and API 5L grades open North American and international oilfield markets. For European projects, BS EN10219 and BS EN10296 compliance ensures the pipe satisfies cold-formed hollow section requirements for structural welding and load-bearing applications. [NEED_CITE: EN 10219 structural hollow section dimensional tolerances] Third-party inspection through SGS or BV provides independent verification for projects requiring certified documentation beyond mill-issued certificates.
Understanding ERW Process and Steel Grade Selection
Electric Resistance Welding fuses the pipe seam through electrical current and pressure without filler metal, producing a clean weld suitable for low-to-medium pressure applications. The hot-rolled coil base material ensures consistent mechanical properties along the pipe length, while the slight oiling prevents surface rust during storage and transit. Q235 offers balanced strength and weldability for general structural use, while Q355 provides higher yield strength for load-critical applications. ASTM A53 Grade B serves American-standard projects, and ST35/ST52 DIN grades meet European machinery and hydraulic system requirements. [NEED_CITE: ERW versus seamless pipe application range comparison]
The Hidden Cost of Unverified Mill Certificates and Negative Tolerance
Pipes with forged or missing MTC documents face customs rejection and project delays, regardless of actual material quality. Negative tolerance abuse — where actual wall thickness falls below the specified minimum — creates structural safety risks and forces costly on-site rework when inspectors discover the discrepancy during ultrasonic testing. [NEED_CITE: steel pipe mill test certificate verification procedures]
Why Project Teams Source Q235 ERW Welded Steel Pipe Through XJY Plate
We maintain ready stock across the full OD range (6–1820 mm) and wall thickness options, eliminating the long lead times typical of made-to-order pipe purchases. Every shipment includes original mill test certificates with heat number traceability, chemical composition, and mechanical properties — verified against our in-house testing equipment before dispatch. Custom cutting to your specified lengths (1–12 m range) reduces on-site waste and welding time. Our logistics team handles heavy cargo loading with flatbed and open-top container expertise, preventing pipe damage and overweight penalties during transit. ISO 9001:2015 and CE certification back our quality system, while SGS/BV third-party inspection remains available for projects requiring independent verification.
Documentation & Compliance
- Mill test certificate documenting Q235 chemical composition and yield strength per GB/T 3091, with heat number traceability
- API 5L certification for oil and gas pipeline applications, confirming compliance with GB/T 9711 requirements
- ISO 9001:2015 quality management certificate covering ERW pipe production and inspection processes
- SGS or BV third-party inspection report available for projects requiring independent dimensional and mechanical verification
- Material traceability documentation linking each pipe to its original heat number and mill test certificate
- Complete customs documentation including packing list, bill of lading, and certificate of origin for smooth port clearance
Packaging, Loading & Delivery
- Q235 ERW welded steel pipe bundled with steel strips and edge protectors to prevent surface damage to the oiled finish during ocean transit
- Slight oil coating applied before packaging to prevent rust formation on hot-rolled surfaces during storage and shipping
- Container loading optimized for 1–12 m lengths, with wooden cradles preventing pipe-to-pipe contact and ovality deformation
- Custom cutting available to your specified lengths within the 1–12 m range, reducing on-site cutting waste and welding time
- Heat number and steel grade stenciled on each pipe end for easy identification and traceability verification at site
- FOB, CIF, and DDP shipping terms available, with professional flatbed and open-top container loading for heavy-wall pipe
Getting Your Q235 ERW Welded Steel Pipe Quote Started
Send us your specifications — outer diameter, wall thickness, length, steel grade, quantity, and destination port — and we respond within 12 hours with a detailed quote including material cost, cutting fees (if applicable), and shipping terms. We provide original mill test certificates before or with shipment for your quality verification, and our team handles custom cutting, beveling, and logistics planning for your project timeline.
Frequently Asked Questions
Q: How do Q235, A36, and S235JR compare across GB, ASTM, and EN standards?
A: These grades represent equivalent carbon structural steel in different standard systems. Q235 (GB/T 700) is the Chinese standard, A36 (ASTM A36) serves American projects, and S235JR (EN 10025) meets European requirements. All three offer similar yield strength and weldability for general structural applications. We provide cross-standard equivalence guidance to help you select the correct grade for your project specifications.
Q: Can you provide original MTC with heat number and third-party inspection (SGS/BV)?
A: Yes. Every shipment includes original mill test certificates documenting chemical composition and mechanical properties, with heat number traceability linking each pipe to its production batch. Third-party inspection through SGS or BV is available for projects requiring independent verification beyond mill-issued documentation.
Q: What is the minimum order for cut-to-size ERW pipe, and can you supply non-standard lengths?
A: Our minimum order quantity is 5 tons. We offer custom cutting within the 1–12 m length range to your specified dimensions, reducing on-site waste and welding time. Non-standard lengths are available subject to production feasibility and order volume.
Q: What is the difference between hot-rolled, oiled, and galvanized ERW pipe for my application?
A: Hot-rolled ERW pipe features a mill scale surface suitable for applications where surface appearance is not critical. Slight oiling provides temporary rust protection during transit and storage without interfering with welding or coating application. Galvanized coating offers long-term corrosion resistance for outdoor or corrosive environment applications. We supply hot-rolled and slightly oiled conditions as standard for Q235 ERW welded steel pipe.
Q: How are heavy round pipes loaded into containers, and do you handle FOB/CIF/DDP terms?
A: We use wooden cradles and edge protectors to prevent pipe-to-pipe contact and surface damage during container loading. Our logistics team specializes in heavy cargo handling with flatbed, open-top container, and break-bulk shipping experience. We offer FOB, CIF, and DDP shipping terms with complete export documentation and tracking until arrival at your destination port.
Request Your Q235 ERW Welded Steel Pipe Quote Today
Send your specifications — OD, wall thickness, length, grade, quantity, and destination — to receive a detailed quote with mill test certificates within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjyplate.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjyplate.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
