Description
Vertically Integrated ERW Pipe Mill — Own steel production facility supplies raw material directly to ERW round pipe fabrication, eliminating trading company markups and ensuring full heat-level traceability from slab to finished pipe.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 Q345 SS400 A36 S235JR Round ERW Welded Steel Pipe |
| Product Type | Round ERW Welded Steel Pipe |
| Steel Grade | Q235, Q345, SS400, A36, A572, S235JR, S355J2 |
| Standard | JIS, ASTM, ISO 9001, CE |
| Section Shape | Round |
| Outer Diameter | 10–2000 mm |
| Length | 6 m / 6.4 m / 12 m |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Hot Rolled / Cold Rolled; Black / Bright / Galvanized / Painted |
| Tolerance | ±1% |
| Oiled or Non-oiled | Non-oiled |
| Invoicing | By Theoretical Weight |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Application | Fluid transport, Gas pipeline, Oil pipeline, Hydraulic system, Boiler, Chemical fertilizer, Drill pipe, Construction structure, Water supply and drainage |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas Pipeline | Onshore gas distribution lines, crude oil gathering systems, refinery process piping |
| Water Infrastructure | Municipal water supply mains, irrigation canal penstocks, drainage culvert systems |
| Industrial Construction | Factory column supports, mezzanine framing, conveyor structure uprights |
| Chemical & Fertilizer | Process fluid transfer lines, cooling water circuits, fertilizer plant piping racks |
| Energy & Boiler | Boiler feedwater lines, steam condensate return, heat exchanger shell piping |
Material Traceability Gaps Cost More Than the Pipe Itself
When an ERW round welded steel pipe supplier cannot prove which heat of steel produced each pipe, the entire project certification chain breaks down.
Overseas buyers sourcing from trading companies frequently discover that material certificates do not match the actual pipes delivered — the heat numbers on the MTC belong to a different mill batch, or the certificates were copied from unrelated orders. Third-party inspectors flag these discrepancies during pre-shipment audits, triggering full-batch re-testing or outright rejection. The result: foundation piling stops, structural steel erection delays, and the buyer absorbs demurrage charges while waiting for replacement material. With vertically integrated production controlling raw steel through finished ERW pipe, every length carries traceable chemistry from our own melt shop. [NEED_CITE: material traceability requirements in EN 10219 structural hollow sections]
Matching OD Range and Steel Grades to Pipeline and Structural Demands
The 10–2000 mm outer diameter range covers everything from small-bore hydraulic lines to large-diameter water transmission mains. For pressurized oil and gas gathering systems, Q345 and A572 grades provide the higher yield strength needed to withstand internal working pressure, while S235JR and Q235 serve adequately for non-critical structural framing and drainage applications. Galvanized surface treatment extends service life in corrosive soil conditions or coastal environments, whereas black or painted finishes suit indoor structural use or temporary construction piping. Each ERW round welded steel pipe undergoes ultrasonic testing on the longitudinal weld seam to confirm fusion integrity before release.
Engineering Compliance and Certification Pathways
Structural applications requiring CE marking for European markets must conform to EN 10219 cold-formed welded structural hollow sections, which mandates specific chemistry limits, impact testing at defined temperatures, and dimensional tolerances tighter than general pipeline standards. North American projects specifying ASTM A53 or A500 demand compliance with different chemistry tables and tensile requirements. Our quality management system holds ISO 9001 certification and CE product certification, enabling direct customs clearance in EU member states without additional conformity assessment. Third-party inspection by SGS or Bureau Veritas is available at our facility before container sealing, providing independent verification of dimensions, coating thickness, and weld quality. [NEED_CITE: CE marking requirements for structural steel under EN 1090]
Understanding ERW Process Advantages and Grade Selection
Electric Resistance Welding heats the steel strip edges through electrical resistance and fuses them under pressure without filler metal, producing a narrow heat-affected zone and consistent weld geometry. Compared to seamless pipe, ERW offers lower cost at larger diameters and tighter dimensional tolerance on wall thickness — critical when invoicing by theoretical weight. The Q-series grades (Q235, Q345) follow Chinese GB standards where the number indicates minimum yield strength in MPa, while S235JR and S355J2 follow European EN standards with JR denoting room-temperature impact testing and J2 indicating testing at minus 20 degrees Celsius. For projects requiring cross-reference between standards, A36 roughly corresponds to S235JR in yield strength, while Q345 aligns with S355J2. Surface treatment selection depends on service environment: hot-dip galvanizing provides sacrificial zinc protection for buried or marine exposure, while shop primer or paint systems suit above-ground structural applications where appearance matters.
Hidden Costs of Unverified Pipe Procurement
Purchasing ERW round welded steel pipe from sources without integrated melt-shop control exposes buyers to chemistry mismatches that only surface during welding — carbon equivalent deviations cause cold cracking in field welds, forcing joint removal and re-welding at multiplied cost. Negative tolerance abuse reduces actual wall thickness below design minimums, compromising pressure rating and structural load capacity without visible indication. Missing or forged material certificates trigger customs holds at destination ports, particularly in markets requiring pre-shipment inspection programs. [NEED_CITE: consequences of material certification fraud in international steel trade]
Why Procurement Teams Choose Integrated Mill Supply
Our own steel production facility operates three rolling lines producing over 2800 specifications of raw material, feeding directly into our pipe fabrication workshop — this vertical integration eliminates the markup and documentation gaps inherent in trading company sourcing. Every heat of steel carries full chemical analysis and mechanical test results traceable to the melt date, enabling us to issue project-specific Mill Test Certificates rather than generic stock certificates. Our quality laboratory performs in-house ultrasonic testing, dimensional verification, and coating thickness measurement before release, while maintaining WPS and PQR records for all welding procedures. We accommodate mixed-grade orders combining Q235 structural pipe with Q345 pressure-rated lengths in single shipments, reducing the number of purchase orders and customs entries buyers must process. Professional loading plans maximize container utilization for 6-meter and 12-meter lengths, with specialized cradles preventing surface damage to galvanized coatings during ocean transit.
Documentation & Compliance
- Mill Test Certificate documenting Q345 chemical composition and mechanical properties per GB/T 1591, with heat number traceable to our own melt shop records
- CE Certificate of Conformity confirming S235JR and S355J2 grades meet EN 10219 requirements for structural hollow sections sold in European markets
- ISO 9001 Quality Management System certificate covering the full production chain from raw steel rolling through ERW pipe fabrication and final inspection
- SGS or Bureau Veritas third-party inspection report verifying outer diameter tolerance, wall thickness, weld seam quality, and galvanized coating weight before shipment
- Material traceability sheet linking each pipe bundle to its heat number, production date, and test specimen location within the original slab
- Complete export documentation package including commercial invoice, packing list, bill of lading, and certificate of origin formatted for destination country customs requirements
Packaging, Loading & Delivery
- ERW round welded steel pipes bundled with galvanized steel strips at intervals matching the 6-meter and 12-meter lengths, with wooden or rubber cradles preventing contact damage to galvanized or painted surfaces
- Black pipe ends capped with plastic protectors to prevent edge damage and moisture ingress during ocean transit, while galvanized bundles receive additional edge protectors preserving zinc coating integrity
- Container loading plans optimized for 20-foot and 40-foot open-top containers based on outer diameter and length, maximizing payload while maintaining weight distribution for port handling equipment
- Custom cutting to non-standard lengths available upon request, with cut ends deburred and re-protected before bundling to match project-specific fabrication sequences
- Each bundle marked with heat number, steel grade, outer diameter, wall thickness, and production date using weather-resistant stencil paint visible after unpacking
- Delivery terms available as FOB, CIF, or DDP to project sites, with door-to-door logistics coordination for landlocked destinations requiring transshipment planning
Initiating Your Procurement Inquiry
Submit your project specifications including outer diameter, wall thickness, steel grade, total tonnage, and destination port to receive a detailed quotation with production timeline and Mill Test Certificate sample. For projects requiring mixed specifications or non-standard lengths, our engineering team will review your bill of materials and propose optimized bundling to minimize freight cost. Confirm certification requirements early — CE marking for European projects or specific ASTM grade callouts for North American work — so we can allocate the correct material heats and prepare third-party inspection scheduling.
Frequently Asked Questions
Q: Can you provide Mill Test Certificates traceable to your own melt shop for each shipment?
A: Yes, every ERW round welded steel pipe we produce carries a Mill Test Certificate documenting chemical composition and mechanical properties, with heat numbers traceable to our own steel production facility records. We do not source pipe from third-party mills and re-issue certificates — the MTC reflects actual test results from our quality laboratory.
Q: What is the minimum order quantity for mixed steel grades in a single shipment?
A: The minimum order quantity is 1 Ton total, allowing you to combine Q235, Q345, S235JR, or other grades in a single container as long as the total weight meets the threshold. This flexibility supports projects requiring different grades for structural versus pressure applications without separate purchase orders.
Q: Do you offer third-party inspection before shipment for projects requiring independent verification?
A: Yes, we accommodate SGS, Bureau Veritas, TUV, or client-nominated inspection agencies at our facility. The inspection covers dimensional verification, visual weld examination, coating thickness measurement, and witness testing as required by your project specification, with the inspection report included in the export documentation package.
Q: How do you handle negative tolerance and theoretical weight invoicing?
A: We invoice by theoretical weight calculated from nominal outer diameter, wall thickness, and length using standard steel density. Our production tolerance of ±1 percent applies to outer diameter, while wall thickness follows standard mill practice. If your project requires guaranteed minimum wall thickness rather than theoretical weight calculation, specify this requirement during inquiry so we can quote accordingly.
Q: Can you supply galvanized ERW pipe for coastal or corrosive environments?
A: Yes, hot-dip galvanized surface treatment is available for ERW round welded steel pipe, with coating weight specified per project requirements. Galvanizing provides sacrificial zinc protection extending service life in marine atmospheres, buried applications, or high-humidity industrial environments. We bundle galvanized pipe with protective cradles to prevent coating damage during handling and transit.
[Request Your ERW Pipe Quotation with Full Material Certification]
Send your project specifications — outer diameter, wall thickness, steel grade, quantity, and destination port — to receive pricing with Mill Test Certificate documentation and production timeline.
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Website: www.xjystructure.com
