Description
Factory-Direct Bulk Supply — 2,800+ hot dip galvanized SHS/RHS specifications in ready stock, shipped from Jinan with original mill test certificates to 50+ countries.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square and Rectangular Steel Tube (SHS/RHS) |
| Steel Grade | Q195–Q690, S235, S275, S355JR, ASTM A500 |
| Standard | ASTM A53, A500, A36, A795; BS1387; EN10255; ISO65; ANSI C80; DIN2440; JIS G3444; GB/T3091, GB/T13793; EN10210, EN10219 |
| Section Shape | Square / Rectangular |
| Size Range (Side Length) | 21.3mm–660mm (1/2″–26″) |
| Length | 5.8m / 6m / 11m or customized |
| Technique | ERW base pipe, Hot-dip Galvanized |
| Surface Treatment | Hot-dip Galvanizing |
| Tolerance | ±1% |
| Ends | Plain ends, Beveled ends, Threaded ends, Grooved ends |
| Pipe Ends Processing | Welding, Punching, Cutting, Bending |
| Application | Municipal water & gas transmission, fluid transport, construction structures, hydraulic systems, precision machinery parts, power plants, boiler systems, petrochemical industry, building industry |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Municipal Infrastructure | Water supply mains, gas distribution networks, drainage culverts |
| Construction & Building | Building frames, scaffolding systems, structural columns, roof trusses |
| Industrial & Mechanical | Hydraulic cylinder housings, conveyor structures, precision machinery frames |
| Energy & Petrochemical | Power plant support structures, boiler piping supports, petrochemical pipe racks |
Why Zinc Coating Uniformity Decides Whether Your Shipment Clears Customs
A failed SGS zinc thickness test at destination port means weeks of demurrage and a container sitting idle.
Buyers sourcing hot dip galvanized square and rectangular steel tubes for municipal water or outdoor structural projects frequently encounter inconsistent zinc coating across batches. Some suppliers quote on electro-galvanized pricing but deliver hot-dip — or claim 70μm while the actual coating falls below 45μm. When the receiving inspector pulls a magnetic gauge reading at the discharge port, the entire lot gets flagged. Customs holds the cargo, the project timeline slips, and the cost of re-inspection or return freight wipes out any per-ton savings you thought you secured. Beyond coating thickness, missing or incomplete mill test certificates create a parallel bottleneck — without traceable heat numbers and chemical composition records, EU and Middle Eastern port authorities will not release the shipment regardless of physical quality [NEED_CITE: EN 10219 cold-formed hollow section requirements].
Matching Galvanized SHS/RHS to Municipal and Structural Environments
Hot dip galvanized square and rectangular steel tubes serve environments where bare carbon steel would corrode within a single wet season. The zinc metallurgical bond formed during hot-dip immersion — typically producing a coating of 45–85μm depending on bath chemistry and immersion time — provides cathodic protection that extends service life in water transmission, gas distribution, and exposed structural frames. For municipal water mains, the smooth zinc interior also reduces friction loss compared to unlined welded pipe. Our production lines run continuous hot-dip galvanizing on ERW base pipe across the full 21.3mm–660mm side-length range, with end processing (threaded, grooved, beveled) completed before or after galvanizing depending on connection type — ensuring that fittings mate correctly on-site without field rework.
Engineering Compliance: EN 10219, ASTM A500, and Project Certification
Structural hollow sections used in load-bearing frames must comply with dimensional and tolerance requirements defined in EN 10219-1 and EN 10219-2 for European projects, or ASTM A500 Grades B/C/D for North American specifications. These standards govern not only chemical composition and mechanical properties but also permissible deviations in wall thickness, flatness of sides, and external corner radii — all of which affect weld fit-up and connection design. For projects requiring CE marking under the Construction Products Regulation, the hot dip galvanized SHS/RHS must carry EN 10210 certification with Factory Production Control documentation [NEED_CITE: CE marking requirements for cold-formed structural hollow sections]. Our production holds Lloyd’s CE (EN 10210/EN 10219) and ISO 9001:2015 certification, with every heat number traceable from raw coil to finished galvanized bundle.
Steel Grade Selection: Q-Series, S-Series, and ASTM Equivalents
The hot dip galvanized square and rectangular steel tube range covers three major grading systems. The Chinese Q-series (Q195–Q690) designates minimum yield strength in MPa — Q235B, the most common structural grade, offers adequate formability for general construction frames. The European S-series (S235, S275, S355JR) follows EN 10219, with S355JR providing higher yield strength for heavier load applications such as crane booms and bridge components. ASTM A500 Grades B and C serve the North American market with distinct tensile and elongation requirements. All three systems are available in our hot-dip galvanized range, and cross-reference tables can be provided to help procurement teams verify equivalence when project specifications call for one standard but local supply chains favor another [NEED_CITE: steel grade equivalence between EN and ASTM standards]. The ERW base pipe ensures consistent weld seam quality before galvanizing, while the ±1% dimensional tolerance keeps section properties within engineering design assumptions.
The Hidden Cost of Buying the Wrong Grade or Missing Certification
Specifying S235 when the structural engineer calculated for S355JR does not show up until the frame deflects under load — or worse, until the building inspector rejects the assembly. Similarly, shipping hot dip galvanized square and rectangular steel tubes to the EU without CE EN 10210 documentation means the cargo cannot legally be installed in any regulated construction project, regardless of whether the physical product meets all technical requirements. Material substitution without mill test certificate verification creates liability exposure that no amount of per-ton discount can offset [NEED_CITE: structural steel certification requirements for EU construction projects].
Why Global Buyers Source Galvanized SHS/RHS Through Xin Jiyuan
Founded in 2013, Shandong Xin Jiyuan Special Steel Tube Co., Ltd operates three production lines in Jinan with monthly capacity exceeding 20,000 tons — all factory-direct, no trading company markup. We maintain ready stock across 2,800+ standard specifications in hot dip galvanized SHS/RHS, enabling same-week dispatch for common sizes while custom orders (non-standard dimensions, special end processing, specific zinc coating requirements) ship within typical production lead times. Every bundle carries original mill test certificates traceable by heat number, and our in-house three-stage inspection catches dimensional and coating defects before dispatch. Third-party SGS or BV inspection is available on request for buyers who require independent verification. For EU-bound shipments, our Lloyd’s CE (EN 10210/EN 10219) and ISO 9001:2015 certifications clear customs without supplementary documentation requests. Our export team handles container loading optimization — a 40HQ loaded with mixed-size galvanized tubes requires precise nesting to maximize weight utilization while protecting zinc coatings from transit abrasion.
Documentation & Compliance
- Mill test certificate documenting Q195–Q690 / S235–S355JR / ASTM A500 chemical composition and mechanical properties per EN 10219 or ASTM A500, traceable to heat number
- CE certificate (EN 10210 / EN 10219) with Factory Production Control records for EU construction project compliance
- ISO 9001:2015 quality management system certificate covering hot-dip galvanized SHS/RHS production lines
- SGS or BV third-party inspection report available on request for zinc coating thickness, dimensional tolerance, and surface quality verification
- Full customs documentation package: commercial invoice, packing list, bill of lading, certificate of origin, and fumigation certificate where required
- Material traceability report linking each bundle to its heat number, coil origin, and galvanizing bath record
Packaging, Loading & Delivery
- Hot dip galvanized SHS/RHS bundled with steel strips and edge protectors to preserve zinc coating integrity during ocean transit and crane handling
- Seaworthy packaging with waterproof wrapping for 5.8m / 6m / 11m standard lengths; custom cut lengths packed separately by size to prevent mixed-bundle damage
- Container loading optimization for 21.3mm–660mm side-length range: nested stacking for smaller sections, single-layer cradle loading for large-diameter RHS to avoid zinc abrasion
- Heat number and steel grade stenciled on each bundle end; color-coded banding by grade (S235 / S355JR / ASTM A500) for rapid site identification
- FOB Jinan/Qingdao port standard; CIF and DDP available to major destination ports across Southeast Asia, Middle East, Africa, and South America
- Split shipment support for trial orders starting from 1 Ton MOQ, with consolidated multi-product container loading for buyers sourcing pipes, beams, and plates together
Start Your Procurement With Verified Specifications
Submit your hot dip galvanized square and rectangular steel tube requirements — including side length, wall thickness, steel grade, total tonnage, and destination port — and receive a factory-direct quotation with volume discount tiers within 12 hours. Request original mill test certificates and CE/ISO documentation previews before contract signing to confirm compliance with your project specifications.
Get Factory-Direct Pricing and Mill Test Certificates
Send your specifications to admin@sdxinjiyuan.com or contact via WhatsApp at +86 188 5315 7756 for bulk quotation and compliance documentation.
Frequently Asked Questions
Q: What is the difference between hot-dip galvanized and pre-galvanized (electro-galvanized) square tubes for municipal water applications?
A: Hot-dip galvanizing produces a metallurgical zinc-iron alloy coating with significantly greater thickness and corrosion resistance than electro-galvanizing, making it the required specification for municipal water transmission and outdoor structural applications where long-term corrosion protection is critical.
Q: How do EN 10219 steel grades (S235, S275, S355JR) compare with ASTM A500 equivalents?
A: These grades belong to different standardization systems but can be cross-referenced by minimum yield strength and chemical composition. We provide equivalence tables upon request and can supply mill test certificates showing compliance with either standard depending on your project requirements.
Q: What is the MOQ for custom non-standard sizes, and do you support split shipments for trial orders?
A: Our MOQ starts from 1 Ton, supporting both trial orders and full-container bulk procurement. Custom non-standard dimensions and special end processing are available with typical production lead times, and split shipment options allow flexible delivery scheduling.
Q: How are mill test certificates and CE/ISO documentation handled for customs clearance in different countries?
A: Every shipment includes original mill test certificates traceable by heat number. For EU destinations, CE EN 10210/EN 10219 certification and Factory Production Control records are provided. Full customs documentation packages are prepared by our export team to meet destination-specific requirements.
Q: What is the typical lead time for stock sizes versus custom-order galvanized square and rectangular tubes?
A: Standard specifications from our 2,800+ ready stock inventory can be dispatched within days of deposit receipt. Custom orders including non-standard dimensions, special steel grades, or specific zinc coating requirements follow typical production lead times confirmed at quotation stage.
Secure Your Factory-Direct Quote With Full Compliance Documentation
Submit your hot dip galvanized SHS/RHS specifications — section size, wall thickness, steel grade, quantity, and destination — to admin@sdxinjiyuan.com or WhatsApp +86 188 5315 7756 for pricing and mill test certificate previews within 12 hours.
