Description
Full-Range Galvanized SHS/RHS Direct Supply — Side lengths from 21.3 mm to 3048 mm with wall thickness up to 50 mm, covering hot-dipped, pre-painted, and electroplated zinc coatings for steel structure projects.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square and Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | Q235, Q345, S235JR, S275JR, STK400, STK500 |
| Standard | GB/T 3091, BS1387, EN39, EN1139, ASTM A53, JIS G3444 |
| Section Shape | Square / Rectangular |
| Size Range (Side Length) | 21.3–3048 mm |
| Wall Thickness | 0.8–50 mm |
| Length | Random Length / Fixed Length / SRL / DRL / Customized |
| Technique | Hot-dipped Galvanized / Pre-painted / Electroplated Galvanized |
| Surface Treatment | Galvanized (zinc coating 10–500 g/m² depending on process) |
| Ends | Plain End / Beveled End / Threaded End |
| Application | Steel structure projects / Low-pressure fluid delivery / Scaffolding / Construction frames |
| MOQ | 5 Tons |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Steel Structure Fabrication | Building frames, industrial warehouse columns, beam-to-column connections |
| Construction & Infrastructure | Scaffolding systems, temporary support structures, bridge handrails |
| Fluid Distribution Networks | Low-pressure water supply lines, gas distribution pipes, oil conveyance |
| Commercial Construction | Curtain wall support frames, mezzanine structures, canopy frameworks |
Zinc Coating Weight Decides Whether Galvanized SHS/RHS Survives the Job Site
A 45-micron coating on a 60-micron contract means rejected cargo and a two-week delay at port.
Buyers sourcing galvanized square and rectangular steel tubes for steel structure projects frequently discover coating thickness discrepancies only after third-party inspection at destination. The root cause often traces back to electroplated tubes being substituted for hot-dipped specifications without documentation. [NEED_CITE: hot-dip galvanizing coating thickness standards per ISO 1461] When zinc coating falls below the contracted weight, the tubes begin corroding within months in humid or coastal environments, forcing costly replacement of already-installed structural members.
Matching Galvanized SHS/RHS to Structural Frame Requirements
Galvanized square and rectangular steel tubes in Q235 and Q345 grades provide the load-bearing capacity needed for primary structural frames while the zinc coating handles atmospheric corrosion without additional painting. For scaffolding and temporary support systems, the combination of S235JR grade with hot-dipped galvanizing delivers adequate strength and long-term surface protection across repeated assembly cycles. Our supply covers side lengths from 21.3 mm up to 3048 mm, allowing fabricators to source both small-brace tubes and large-column sections from a single Galvanized Square and Rectangular Steel Tube supplier rather than splitting orders across multiple vendors.
Structural Code Compliance and Corrosion Environment Selection
Steel structure projects in different regions require specific standard compliance: EN39 and EN1139 for European scaffolding, ASTM A53 for North American structural applications, and JIS G3444 for Japanese-spec construction frames. [NEED_CITE: steel grade equivalence between EN and ASTM standards] Hot-dipped galvanizing with zinc coating above 120 g/m² suits coastal and industrial environments where pre-painted or electroplated alternatives would degrade prematurely. Fixed-length delivery with beveled or threaded ends reduces on-site cutting and welding, which otherwise damages the zinc layer at joint locations and creates corrosion initiation points.
Understanding Galvanizing Processes and Steel Grade Selection
Hot-dipped galvanizing deposits 120–500 g/m² of zinc through immersion in molten zinc baths, producing a metallurgically bonded coating that resists mechanical damage during transport and installation. Pre-painted galvanizing applies 60–120 g/m² zinc followed by organic coating, offering color matching for architectural exposure. Electroplated galvanizing achieves only 10–50 g/m², suitable for indoor structural applications where corrosion exposure remains minimal. The Q-series grades (Q235, Q345) follow Chinese GB standards with yield strength designations, while S235JR and S275JR conform to European EN specifications — both systems provide comparable structural performance when properly documented. Wall thickness tolerance directly affects theoretical weight calculations; negative tolerance beyond standard limits reduces actual load capacity while appearing compliant on paper. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
The Hidden Cost of Incorrect Coating Specification
Ordering electroplated galvanized tubes when the project environment demands hot-dipped coating leads to premature rust formation, structural inspection failures, and potential liability for compromised safety. Missing mill test certificates prevent verification of steel grade and chemical composition, causing customs holds in markets requiring EN 10219 or ASTM A500 documentation. [NEED_CITE: EN 10219 cold-formed hollow section requirements] Thickness deviation beyond permissible tolerance means the structure carries less load than engineered, creating safety risks that surface only during final inspection or under extreme loading conditions.
Procurement Confidence Through Verified Supply Chain
Every Galvanized Square and Rectangular Steel Tube we supply ships with original mill test certificates documenting heat number, chemical composition, and mechanical properties per the specified standard. Our in-house metallurgical laboratory verifies zinc coating weight and adhesion before dispatch, eliminating the discrepancy between contracted and delivered coating thickness. We maintain ready stock across the full dimensional range from 21.3 mm to 3048 mm side length, enabling mixed-size container loading that maximizes freight efficiency for steel structure projects. Professional export packaging with edge protectors preserves the galvanized surface during ocean transit, while our logistics team handles flatbed and open-top container loading for heavy-wall sections up to 50 mm thickness. ISO 9001:2015 certification and CE marking ensure compliance across European, Southeast Asian, and Middle Eastern markets, with SGS or BV third-party inspection available upon request.
Documentation & Compliance
- Mill test certificate documenting Q235 or Q345 chemical composition and mechanical properties per GB/T 3091
- CE certificate confirming EN39 and EN1139 compliance for European scaffolding and structural applications
- ISO 9001:2015 quality management certificate covering galvanizing process and dimensional inspection
- SGS or BV third-party inspection report verifying zinc coating weight and surface quality before shipment
- Material traceability by heat number linking each Galvanized Square and Rectangular Steel Tube to its original coil source
- Complete customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Galvanized tubes bundled with steel strips and plastic edge protectors to preserve zinc coating integrity during ocean freight
- Surface protection through passivation treatment preventing white rust formation on hot-dipped galvanized SHS/RHS during humid transit conditions
- Container loading optimization combining multiple side lengths from 21.3 mm to 500 mm in 20ft or 40ft containers to maximize weight utilization
- Fixed-length cutting to project specifications eliminating on-site waste for steel structure frame fabrication
- Heat number and steel grade markings stenciled on each bundle for site identification and inspection traceability
- FOB, CIF, and DDP shipping terms available with professional heavy-cargo logistics for wall thickness up to 50 mm
Initiating Your Galvanized Tube Procurement
Submit your required steel grade, side length, wall thickness, quantity, and destination port to receive a detailed quotation including material cost, processing fees, and shipping terms within 12 hours. We provide mill test certificates for review before shipment confirmation, ensuring full compliance with your project specifications. For non-standard dimensions or custom cutting requirements, our technical team will advise on feasible specifications and minimum order quantities.
Frequently Asked Questions
Q: What is the difference between hot-dipped, pre-galvanized, and electroplated galvanized tubes?
A: Hot-dipped galvanizing immerses tubes in molten zinc to deposit 120–500 g/m² coating with metallurgical bonding for maximum corrosion resistance. Pre-painted galvanizing applies 60–120 g/m² zinc followed by organic coating for color and moderate protection. Electroplated galvanizing deposits only 10–50 g/m² through electrical process, suitable for indoor applications with minimal corrosion exposure.
Q: How do you verify zinc coating thickness and adhesion quality?
A: We conduct in-house testing using portable coating thickness gauges on every production batch, with results documented in the mill test certificate. Third-party verification through SGS or BV inspection is available before shipment for independent confirmation of coating weight per ISO 1461 or project specifications.
Q: Can you produce non-standard sizes and what is the MOQ for custom dimensions?
A: Custom side lengths and wall thickness outside standard ranges can be produced based on project requirements. The minimum order quantity for standard Galvanized Square and Rectangular Steel Tube is 5 tons, while custom dimensions may require higher quantities depending on mill rolling schedules.
Q: Which standards apply for galvanized SHS/RHS in EU, US, and Asian markets?
A: European markets typically require EN39 and EN1139 for scaffolding and structural tubes. North American projects specify ASTM A53 for structural applications. Asian markets commonly accept GB/T 3091 for Chinese grade tubes or JIS G3444 for Japanese specifications. We supply all these standards with appropriate mill test certification.
Q: How are galvanized tubes packed and loaded to prevent damage during ocean freight?
A: Tubes are bundled with steel strips and protected by plastic edge guards to prevent zinc coating abrasion. Heavy-wall sections and long-length tubes use open-top containers or flatbed loading with proper weight distribution. Passivation treatment prevents white rust formation during humid transit conditions.
Request Your Galvanized SHS/RHS Quotation Today
Send your specifications including steel grade, dimensions, quantity, and destination to receive pricing and mill test certificates within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjyplate.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjyplate.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
