Description
Factory-Direct Galvanized SHS/RHS — Every batch ships with original mill test certificates and CE/ISO compliance for EU and global customs clearance.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235B Galvanized Square and Rectangular Steel Tube |
| Product Type | Galvanized Square and Rectangular Hollow Section (SHS / RHS) |
| Steel Grade | Q195, Q215, Q235, Q345 |
| Standard | BS, EN, GB, AISI, ASTM, DIN, JIS |
| Section Shape | Square / Rectangular |
| Size Range | Side length 10 mm – 1000 mm |
| Wall Thickness | 0.6 – 28 mm |
| Length | 1 – 12 m |
| Technique | ERW (Hot Rolled / Cold Rolled) |
| Surface Treatment | Hot-Dip Galvanized (Zinc Coating 30 – 275 g/m²); also Bare, Oiled, Color Paint, 3PE |
| Tolerance | ±1% |
| Ends | Plain / Beveled / Threaded with couplings or sockets |
| Application | Building structures, industrial frames, machinery, scaffolding, bridges, pressure vessels, general engineering structures |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Structural frames, scaffolding systems, building column supports, roof trusses |
| Industrial & Machinery | Equipment base frames, conveyor structures, machine guarding enclosures |
| Bridges & Engineering | Load-bearing hollow sections for bridge railings, pressure vessel supports, signage gantries |
Where Zinc Coating Thickness Decides Project Acceptance
A 45-micron reading on a Z275-specified tube means the entire shipment fails inspection.
I watched an entire container of galvanized square tubes get rejected at a Brazilian warehouse because the zinc coating measured well below contract spec — and the corners showed bare spots where the dip never reached. The buyer paid weeks of port storage fees on top of re-ordering from scratch. When your Hot Dip Galvanized Square and Rectangular Steel Tube arrives with inconsistent coating or missing mill certificates, customs holds the cargo, the监理 signs off on nothing, and your margin evaporates before the first beam goes up. [NEED_CITE: EN 10219 cold-formed hollow section requirements]
Matching Structural Frames and Scaffolding to Corrosive Site Conditions
Hot-dip galvanizing at 30–275 g/m² gives Q235B and Q345 hollow sections the corrosion buffer needed for outdoor scaffolding, coastal construction frames, and industrial racks exposed to humidity. The zinc metallurgically bonds to the steel surface, so even if the tube gets scratched during transport or on-site handling, the surrounding coating provides cathodic protection rather than letting rust spread unchecked. Our Hot Dip Galvanized Square and Rectangular Steel Tube covers side lengths from 10 mm to 1000 mm, so the same supply line feeds both small bracket members and large column sections without splitting orders across vendors.
Engineering Code Compliance and Certification Pathways
Structural hollow sections used in load-bearing frames must meet dimensional and tolerance requirements under EN 10219 for cold-formed welded profiles or EN 10210 for seamless equivalents, depending on the forming route. For EU-bound projects, CE marking per EN 10210/EN 10219 is non-negotiable at customs — missing paperwork means the container sits at port until the importer scrambles for retroactive documentation. Wall thickness tolerance of ±1% on our ERW-produced tubes keeps sectional properties within the range structural engineers calculate against, and every heat number is traceable back to the original mill test certificate. [NEED_CITE: steel grade equivalence between EN and ASTM standards]
Steel Grade Selection and ERW Weld Integrity
Q195 through Q345 represent a yield strength progression — Q195 suits light-duty framing and fencing where formability matters more than load capacity, while Q345 steps into heavier structural work where higher yield reduces member sizes and overall weight. The ERW welding process uses high-frequency current to fuse the seam without filler metal, producing a weld zone that matches the base metal’s mechanical properties when properly controlled. Hot-dip galvanizing after welding coats both the outer and inner surfaces, including the weld seam itself, which is why coating adhesion at the seam is a critical inspection point — poor prep leaves the weld line as the first place zinc peels. Wall thickness from 0.6 mm to 28 mm covers everything from thin-wall decorative tubing to heavy structural box columns, and the ±1% tolerance ensures theoretical weight invoicing stays aligned with actual delivered mass.
The Hidden Cost of Coating Failures and Missing Paperwork
Ordering galvanized hollow sections without verified coating thickness is a gamble — thin zinc means premature rust, and rust means the structure fails inspection years before design life. Material certificates that don’t match heat numbers on the tube ends get flagged by site inspectors, and mismatched certificates get flagged again at customs. Tubes produced outside tolerance force contractors to re-engineer connections or scrap members entirely, and neither cost shows up on the original purchase order. [NEED_CITE: hot-dip galvanizing coating thickness verification methods]
Why Bulk Buyers Source Galvanized Tubes Through Xin Jiyuan
We run three production lines simultaneously, giving monthly capacity above 20,000 tons of welded and galvanized hollow sections — large enough to fill project orders without queuing behind smaller runs. Every shipment leaves Jinan with original mill test certificates showing chemical composition and mechanical properties per heat number, and we welcome SGS or BV third-party inspection before the container is sealed. Our inventory covers 2,800+ standard specifications in square and rectangular profiles, so split shipments and urgent replenishment orders ship from stock rather than waiting for production slots. Factory-direct pricing means no trading company markup, and volume discount programs reward partners who consolidate annual procurement through a single source. Professional export documentation and container loading optimization keep FOB and CIF deliveries on schedule across 50+ countries.
Documentation & Compliance
- Mill test certificate documenting Q195–Q345 chemical composition and yield strength per EN 10219 / GB standards for every heat number
- CE certificate covering EN 10210 and EN 10219 compliance for EU market customs clearance and project acceptance
- ISO 9001:2015 quality management certificate covering full production and inspection workflow
- SGS or BV third-party inspection report available on request before shipment departure
- Material traceability by heat number linking each tube bundle to its original mill test certificate
- Complete customs document package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Hot-dip galvanized Q235B and Q345 tubes bundled with steel strips and edge protectors to preserve the zinc coating during ocean transit
- Seaworthy packaging with waterproof wrapping for 1–12 m lengths, sized to fit 20ft and 40ft containers without overhang
- Container loading plans optimized for square and rectangular sections from 10 mm to 1000 mm side length, maximizing payload per TEU
- Heat number and steel grade stenciled on each bundle for site identification and inspection traceability
- FOB, CIF, and DDP shipping terms available with professional customs clearance support
- Custom length cutting to project-specific dimensions reduces on-site waste and secondary processing
Ready to Lock In Coating Spec and Delivery Schedule
Send your specification sheet — section dimensions, wall thickness, steel grade, zinc coating requirement, quantity, and destination port — and receive a bulk quotation with volume pricing, mill test certificate confirmation, and production lead time within 12 hours. Non-standard dimensions and custom end treatments are available for trial orders starting at 1 Ton.
Request Your Galvanized SHS/RHS Quotation
Submit your specifications via email at admin@sdxinjiyuan.com or contact us on WhatsApp at +86 188 5315 7756 to receive pricing, mill test certificate samples, and third-party inspection options.
Frequently Asked Questions
Q: What zinc coating range is available for hot-dip galvanized square and rectangular tubes?
A: Hot-dip galvanizing covers 30–275 g/m², selected based on the service environment — lighter coatings suit indoor structural frames, while 275 g/m² is specified for outdoor, marine, or industrial corrosion conditions.
Q: Can I order non-standard side lengths or wall thicknesses outside the catalog range?
A: Yes, side lengths from 10 mm to 1000 mm and wall thicknesses from 0.6 mm to 28 mm are available, and custom dimensions are produced to order with typical lead times confirmed at quotation stage.
Q: What documentation accompanies each shipment for customs and project inspection?
A: Every batch ships with original mill test certificates showing chemical composition and mechanical properties per heat number, and CE/ISO certification is provided for EU-bound orders. SGS or BV third-party inspection is available on request.
Q: How does theoretical weight invoicing work with tolerance specifications?
A: Tubes are invoiced by theoretical weight calculated from nominal dimensions and standard density, with wall thickness held within ±1% tolerance — this keeps delivered mass aligned with structural engineering calculations.
Q: What is the minimum order quantity for trial or project orders?
A: The MOQ is 1 Ton, allowing trial orders for quality verification before committing to full-container bulk procurement.
Secure Your Galvanized Hollow Section Supply
Email admin@sdxinjiyuan.com or WhatsApp +86 188 5315 7756 with your section sizes, steel grade, and destination to receive a factory-direct quotation and mill test certificate confirmation.
