Description
Factory-direct pricing, no broker markup — Every Galvanized ERW Square Rectangular Steel Pipe we ship comes straight from our own ERW and galvanizing lines in Jinan, eliminating middleman margins on orders from 25 Tons upward.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized ERW Square/Rectangular Steel Pipe |
| Product Type | Square / Rectangular Steel Tube (Galvanized, ERW) |
| Steel Grade | Q195, Q215, Q235, Q345, ASTM, S235, SS400 |
| Standard | GB, API, CE, JIS, ISO 9001 |
| Section Shape | Square / Rectangular / Round |
| Size Range | 20×20 mm – 200×200 mm |
| Wall Thickness | 1.5 – 30 mm |
| Length | 1 – 12 m (customizable) |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Galvanized Coated |
| Tolerance | ±5% |
| Ends | Plain (customizable) |
| Processing Services | Welding, Punching, Cutting, Bending, Decoiling |
| Application | Structural, Construction, Pipeline, Machinery, Mining |
| MOQ | 25 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors & Energy | Pipeline supports, platform framing, structural bracing for oil & gas and chemical plants |
| Construction & Infrastructure | High-rise building columns, bridge handrails, scaffolding systems, roofing purlins |
| Machinery Manufacturers | Conveyor frames, hydraulic cylinder housings, equipment base structures |
| Electrical & Installation | Cable tray supports, solar panel mounting structures, lighting pole bases |
| Mining | Ventilation duct framing, underground support structures, slurry transport brackets |
What Galvanizing Thickness Really Means When the Inspector Shows Up at Port
A zinc coating below spec turns a compliant shipment into a rejected container.
I watched a full load of 100×100×4mm galvanized square tubes get flagged at Jakarta because the coating measured 40 microns against a 65-micron minimum. The third-party inspector did not care about our mill certificate — he cared about what his gauge read on the dock. Re-galvanizing on-site cost more than the original coating process, and the client nearly walked. When sourcing a Galvanized ERW Square Rectangular Steel Pipe Supplier, the question is not whether the supplier has a certificate, but whether their galvanizing line holds tolerance under production speed. [NEED_CITE: ASTM A123 minimum zinc coating thickness requirements for structural steel]
Matching Galvanized ERW Tubes to Structural and Corrosive Environments
A Galvanized ERW Square Rectangular Steel Pipe in Q235 or Q345 handles both load-bearing frames and outdoor exposure where rust would otherwise shorten service life. The ERW seam runs straight along the flat face of square and rectangular sections, keeping the zinc coating continuous across corners — critical for scaffolding and solar mounting where water pools. Our in-house lab checks coating adhesion and thickness per batch, so the tubes arriving at your site carry the same corrosion resistance the engineer specified.
Engineering Compliance Across Standards and Borders
Structural frames designed to EN 1993 or AISC require documented material traceability — heat number, chemical composition, yield behavior — not just a product label. Galvanized ERW Square Rectangular Steel Pipe orders shipped to the EU must carry CE marking under EN 10210 or EN 10219; North American projects reference ASTM A500. We produce to GB, API, CE, and JIS simultaneously, and our physical and chemical laboratory generates mill test certificates that satisfy both the structural engineer and the customs officer. [NEED_CITE: EN 10219 cold-formed welded structural hollow sections compliance]
Steel Grade Selection and ERW Process Fundamentals
Q195 through Q345 represent a Chinese grade family where the number indicates minimum yield strength in MPa — Q235 suits general structural framing, while Q345 steps up for heavier loads in bridges and industrial platforms. S235 and SS400 serve as direct equivalents for European and Japanese spec sheets, reducing the need for separate procurement streams. The ERW process fuses the seam through electrical resistance heating without filler metal, producing a clean weld line that accepts galvanizing uniformly — unlike hot-dip processes on seamless tubes where coating buildup at the weld can create uneven thickness. Galvanized coating, typically 40–80 microns depending on spec, provides sacrificial protection for outdoor, marine, and chemical environments where painted or oiled finishes would degrade within months. Wall thickness from 1.5 mm to 30 mm covers everything from light gauge purlins to heavy-duty hydraulic housings, and the ±5% tolerance keeps theoretical weight calculations aligned with actual delivered mass.
The Hidden Cost of Choosing the Wrong Supplier
A Galvanized ERW Square Rectangular Steel Pipe that arrives with sub-spec zinc, undocumented chemistry, or wall thickness drifting beyond tolerance creates costs far beyond the unit price. Customs holds shipments missing CE or mill test certificates; structural inspectors reject frames where heat numbers do not match paperwork; and rework on-site — cutting, re-welding, re-galvanizing — can double the original material cost. Engineering codes reference material standards precisely because unverified steel fails unpredictably under load. [NEED_CITE: consequences of non-compliant steel in structural engineering projects]
Why Procurement Teams Return to Xin Jiyuan
We run three dedicated ERW and galvanizing lines in Jinan, so every Galvanized ERW Square Rectangular Steel Pipe rolls, welds, and coats under one roof — no trading company markup, no handoff between mills. Our in-house physical and chemical laboratory tests every heat before the tube leaves the line, and we issue mill test certificates with full traceability. With 2,800+ specifications in stock and 41 patented technologies including proprietary sharp-corner rectangular tube production, we fill gaps that standard catalogs cannot. CE EN 10210/10219, ISO 9001:2015, Singapore FPC, and third-party verification through SGS and BV clear EU, North American, and Middle Eastern customs without delay. Custom lengths, non-standard dimensions, and cutting, punching, or bending services arrive ready to install — and our loading team optimizes every container for the 20×20 to 200×200 mm range to minimize freight cost per ton.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and mechanical properties per GB and ASTM equivalents, traceable by heat number
- CE certificate under EN 10210/EN 10219 for structural hollow sections exported to European Union markets
- ISO 9001:2015 quality management certificate covering the full ERW and galvanizing production process
- SGS or BV third-party inspection report available before shipment for independent zinc coating and dimensional verification
- Material traceability by heat number linking each Galvanized ERW Square Rectangular Steel Pipe bundle to its original coil chemistry
- Full customs documentation package: packing list, bill of lading, certificate of origin, and commercial invoice
Packaging, Loading & Delivery
- Galvanized ERW Square Rectangular Steel Pipe bundles secured with steel strips and edge protectors to prevent zinc coating damage during ocean transit
- Seaworthy packaging with waterproof wrapping for 1–12 m lengths, suitable for 20ft and 40ft container loading optimized across the 20×20 to 200×200 mm size range
- Heat number and steel grade stenciled on each bundle end for on-site identification and traceability matching mill test certificates
- Custom cutting to project-specific lengths available before shipment, reducing on-site waste and welding joints
- FOB, CIF, and DDP terms supported with door-to-door logistics to 50+ countries including EU, North America, Southeast Asia, and the Middle East
Start Your Procurement With Verified Specifications
Submit your Galvanized ERW Square Rectangular Steel Pipe requirements — size, wall thickness, steel grade, quantity, and destination port — and receive a detailed quotation with mill test certificate samples and delivery timeline within 12 hours.
Request Your Quotation and Mill Test Certificate
Send your specifications to admin@sdxjysteel.com or reach us via WhatsApp at +86 188 5315 7756.
Frequently Asked Questions
Q: Can you provide mill test certificates and arrange third-party inspection before shipment?
A: Yes. Every Galvanized ERW Square Rectangular Steel Pipe shipment includes a mill test certificate documenting chemical composition and mechanical properties by heat number. We also coordinate SGS or BV third-party inspections at our facility before loading, so you receive independent verification of zinc coating thickness, dimensions, and weld quality.
Q: Do you accept custom lengths and non-standard dimensions beyond the 20×20 to 200×200 mm range?
A: Yes. We produce custom lengths from 1 to 12 meters and can manufacture non-standard sizes outside the regular catalog. Our 2,800+ specification range and dedicated production lines allow flexibility, though custom orders may require higher MOQ depending on the profile.
Q: How do Q235, S235, and SS400 steel grades compare for structural applications?
A: Q235, S235, and SS400 are closely equivalent grades across Chinese, European, and Japanese standards, all suitable for general structural framing. Q345 offers higher yield strength for heavier loads. We supply all grades and can provide cross-reference documentation for your engineer.
Q: What certifications do your galvanized tubes carry for EU and North American customs clearance?
A: Our Galvanized ERW Square Rectangular Steel Pipe products carry CE marking under EN 10210/10219 for EU markets, ISO 9001:2015 for quality management, and can be produced to ASTM standards for North American projects. Full customs documentation including certificate of origin is provided with every shipment.
Q: How do you optimize container loading for heavy galvanized steel tubes?
A: Our loading team plans container stowage based on tube dimensions and weight distribution across the 20×20 to 200×200 mm range, maximizing payload per 20ft or 40ft container. We use edge protectors and steel strip bundling to prevent coating damage and shifting during transit, supporting FOB, CIF, and DDP terms.
Get Factory-Direct Pricing on Your Next Galvanized ERW Steel Tube Order
Email your project specifications to admin@sdxjysteel.com or call +86 531 8573 6315 to receive a detailed quotation with material certifications and delivery schedule.
