Description
Direct Mill Supply — Full Traceability from Q195 to S355JR Grades
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ERW Cold Rolled Carbon Steel Welded Pipe |
| Product Type | Round Steel Pipe / ERW Welded Steel Pipe |
| Steel Grade | Q195, Q235, Q345, S235JR, S275JR, S355JR |
| Standard | API, CE, JIS, ISO 9001 |
| Section Shape | Round |
| Outer Diameter | 9 Inch (approx. 219.1 mm) |
| Length | 1–12 m |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Cold Rolled, Black Painted |
| Tolerance | ±1% |
| Oiled or Non-oiled | Non-oiled |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Application | Fluid Pipe, Boiler Pipe, Drill Pipe, Hydraulic Pipe, Gas Pipe, Oil Pipe, Chemical Fertilizer Pipe, Structure Pipe |
| MOQ | 20 Tons |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Fluid transport lines, gas distribution networks, drill pipe casings |
| Industrial Construction | Load-bearing structural frames, conveyor supports, scaffolding uprights |
| Pressure Systems | Boiler feed lines, high-temperature process piping, chemical fertilizer plant circuits |
| Infrastructure | Bridge handrails, highway signpost columns, utility pole foundations |
What Wall-Thickness Tolerance Costs on a Structural Frame Order
A ±1% tolerance on ERW cold rolled carbon steel welded pipe prevents rejection at third-party inspection.
Buyers sourcing round welded pipe for structural or pressure applications frequently encounter wall thickness deviations that exceed project specifications. When actual measurements fall below design minimums, engineers must either reject the entire batch or request costly re-engineering approvals. Inconsistent tolerances also create welding fit-up problems on site, where mismatched wall thicknesses between adjacent joints compromise weld integrity. [NEED_CITE: EN 10219 dimensional tolerance requirements for cold-formed welded hollow sections]
How This Pipe Matches Oil & Gas and Structural Engineering Requirements
The ERW cold rolled carbon steel welded pipe in Q235 and S355JR grades delivers the dimensional consistency required for pressurized fluid transport and load-bearing frames. Cold rolled surface treatment combined with black painted coating provides baseline corrosion protection during transit and installation, while the ±1% tolerance ensures uniform wall thickness across the full 1–12 m length range. For oil & gas pipeline projects, API certification supports customs clearance and regulatory compliance in destination markets. Our loading teams calculate weight distribution per container to avoid overweight penalties at port scales — a lesson learned after a 20-foot container to Santos was flagged for exceeding gross weight limits.
Engineering Compliance and Certification Pathways
Structural applications governed by EN 1993 or AISC specifications require documented proof that steel grades meet minimum yield strength and chemical composition thresholds. The S235JR, S275JR, and S355JR grades in this product line conform to European standard frameworks, while Q235 and Q345 align with Chinese GB standards commonly specified in Southeast Asian and African infrastructure projects. CE certification supports EU market entry, and JIS compliance addresses Japanese-standard specifications for industrial plant construction. Third-party inspection via SGS or BV provides independent verification of mechanical properties and dimensional accuracy before shipment. [NEED_CITE: steel grade equivalence mapping between GB, EN, and ASTM systems]
Steel Grade Selection and ERW Process Fundamentals
Carbon steel grades Q195 through Q345 represent the Chinese GB standard system, with yield strength increasing progressively across the range. Q195 suits light structural applications where formability matters more than load capacity, while Q345 delivers higher strength for pressure vessel and boiler piping. The S-series grades (S235JR, S275JR, S355JR) follow European EN standards, with JR designation indicating room-temperature impact testing requirements. ERW (Electric Resistance Welded) process creates a longitudinal weld seam through resistive heating without filler metal, producing a cost-effective alternative to seamless pipe for low-to-medium pressure applications. Cold rolling after welding improves surface finish and dimensional accuracy compared to hot-rolled alternatives, though it limits maximum wall thickness availability. Black painted coating provides short-term rust prevention during storage and transit but requires additional protection for long-term outdoor exposure or corrosive environments.
Hidden Costs of Incorrect Grade Selection and Missing Documentation
Specifying Q235 when project drawings call for S235JR creates compliance gaps that surface during engineer approval or customs inspection. Material substitution without documented equivalence approval triggers rejection at site, forcing either air freight replacement or project delay while new material ships. Missing mill test certificates with heat number traceability prevent verification that chemical composition matches the specified grade, leaving structural engineers unable to certify load calculations. Negative tolerance practices that push actual wall thickness below nominal values reduce pressure rating safety margins and may violate ASME or EN code requirements for boiler and pressure vessel applications. [NEED_CITE: pressure vessel code requirements for material traceability and test certification]
Why Source ERW Cold Rolled Carbon Steel Welded Pipe from XJY Plate
We operate as a dedicated plate and coil division under Shandong Xin Jiyuan Special Steel Tube Co., Ltd, giving you direct mill access without trading company markups. Every shipment includes original mill test certificates showing heat number, chemical composition, and mechanical properties — no photocopies or reissued documents. Our inventory spans Q195 through S355JR grades in common outer diameters and wall thicknesses, reducing lead times for urgent project requirements. Custom cutting to exact project lengths eliminates on-site waste and reduces freight costs by maximizing container payload. Professional heavy cargo loading teams prepare detailed stowage plans for 12 m long pipes, preventing damage during ocean transit and avoiding port rejection for improper weight distribution. ISO 9001:2015 certification and CE marking support international project compliance, while SGS/BV third-party inspection provides independent quality verification for risk-averse buyers.
Documentation & Compliance
- Mill test certificate documenting Q235/S355JR chemical composition and mechanical properties per applicable standard, with heat number traceability
- CE certificate confirming compliance with European pressure equipment or structural steel directives for EU market customs clearance
- ISO 9001:2015 quality management system certificate covering production process and inspection procedures
- SGS or BV third-party inspection report verifying dimensional accuracy, surface quality, and mechanical test results upon request
- Material traceability documentation linking each pipe to specific heat number and mill production batch
- Export customs documents including packing list, bill of lading, and certificate of origin for destination port clearance
Packaging, Loading & Delivery
- ERW cold rolled carbon steel welded pipe bundled with steel strips and edge protectors to preserve black painted surface during ocean transit
- 12 m length pipes loaded in 20-foot or 40-foot open-top containers with detailed stowage plan showing weight distribution to avoid overweight penalties
- Custom cutting service available to produce exact project lengths from 1–12 m range, reducing on-site cutting waste and freight costs
- Heat number and steel grade stenciled on each pipe end for site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with professional heavy cargo logistics team experienced in flatbed and break-bulk shipping
- Non-oiled surface condition ready for immediate painting or coating application upon arrival at project site
Getting Your ERW Cold Rolled Carbon Steel Welded Pipe Quote
Submit your specification sheet showing steel grade, outer diameter, wall thickness, length, and quantity to receive a detailed quotation within 12 hours. Include destination port or project site address for accurate freight calculation and delivery timeline. We provide mill test certificate samples and third-party inspection options before contract signing to confirm material compliance with your project requirements.
Request Specification Matching and Mill Test Certificate
Send your ERW cold rolled carbon steel welded pipe requirements with steel grade, dimensions, quantity, and destination to receive pricing and original mill test certificate documentation.
Contact:
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjyplate.com
Website: www.xjyplate.com
