Description
Factory-Direct Galvanized RHS/SHS — Hot-rolled base with Z30–Z60 zinc coating, CE EN10219 certified for EU structural projects.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Rectangular Steel Tube |
| Product Type | Galvanized Square and Rectangular Steel Tube |
| Steel Grade | Q195, Q235, Q345, STK400, STK500, S235, S355 |
| Standard | GB, ASTM, JIS, EN10219, EN10210 |
| Section Shape | Square / Rectangular |
| Wall Thickness | 1.0 mm – 2.0 mm |
| Length | 6 – 12 m |
| Technique | Hot Rolled Based |
| Surface Treatment | Galvanized Zinc (Coating Z30 – Z60) |
| Spangle Type | Regular Spangle / Zero Spangle |
| Tolerance | ±1% |
| Ends | Plain |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Application | Steel structures, Construction frames, Machinery, Fences, Container manufacturing, Corrugated sheets, Pipe making |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Steel Structures | Building frames, scaffolding supports, roof trusses, column bracing |
| Infrastructure & Fencing | Highway guardrails, boundary fencing posts, industrial enclosure frames |
| Container & Equipment Manufacturing | Modular container frames, machinery base structures, storage rack systems |
| Agricultural & Industrial Sheds | Purlin systems, portal frame structures, corrugated sheet support purlins |
Where Dimensional Tolerance Decides Site Assembly Costs for Galvanized Rectangular Steel Tube
±1% tolerance on hot-rolled base material means connection plates fit without on-site grinding.
When procurement teams order galvanized RHS/SHS for steel frame projects, the last thing they want is finding out at the erection stage that tube dimensions are off by 2–3 mm, forcing welders to re-cut connection plates or grind weld seams. Thin-wall galvanized tubes in the 1.0–2.0 mm range are especially vulnerable — the galvanizing process itself can introduce slight dimensional shifts if the base material was not controlled to tight tolerances beforehand. We have seen entire container loads rejected at destination because the supplier quoted “standard tolerance” but delivered tubes that failed fit-up checks on bolted connections [NEED_CITE: EN 10219 dimensional tolerance requirements for cold-formed hollow sections].
How Galvanized RHS/SHS Meets Structural Frame Requirements in Corrosive Environments
For construction frames and scaffolding exposed to outdoor weathering or coastal humidity, the Z30–Z60 zinc coating on hot-rolled base tubes provides sacrificial corrosion protection that extends service life without additional painting. The Galvanized Rectangular Steel Tube in Q235 and S355 grades covers both domestic Chinese projects and European structural specifications, allowing EPC contractors to source a single product line across multiple job sites. Our in-house physical and chemical laboratory tests every batch for coating weight and adhesion before release, ensuring the zinc layer meets the specified Z30–Z60 range rather than falling below minimum threshold.
Engineering Compliance and Steel Grade Selection for Galvanized Hollow Sections
Structural engineers designing to EN 1993 (Eurocode 3) require hollow sections manufactured under EN 10219 for cold-formed welded profiles or EN 10210 for seamless and welded sections — the Galvanized Rectangular Steel Tube we supply carries CE marking under both standards, clearing EU customs without documentation disputes [NEED_CITE: CE marking requirements for structural steel hollow sections under EN 10219]. For projects in Southeast Asia and the Middle East, JIS STK400/STK500 and GB Q235/Q345 grades provide equivalent mechanical performance with local code acceptance. The ±1% dimensional tolerance ensures that 6 m and 12 m lengths maintain straightness and squareness required for moment-resisting frame connections, while plain ends allow on-site welding or mechanical coupling without additional preparation.
Understanding Steel Grade Equivalence and Galvanizing Process for Thin-Wall Tubes
The steel grade coverage spanning Q195–Q345 (GB), S235–S355 (EN), and STK400–STK500 (JIS) addresses a common procurement pain point: projects specifying different standards for the same structural application. S235JR and Q235B share similar yield strength ranges and carbon equivalents, making them interchangeable for non-critical framing, while S355J2H offers higher strength for heavily loaded columns and beams [NEED_CITE: steel grade equivalence between EN 10219 and GB/T 6728 standards]. The hot-rolled base material provides better surface quality and more consistent wall thickness compared to cold-rolled alternatives, which matters significantly when the tube will undergo galvanizing — uneven base surfaces lead to uneven zinc adhesion and premature coating failure. Regular spangle finish suits industrial applications where appearance is secondary, while zero spangle provides a uniform matte surface for architectural facades and visible structural elements.
The Hidden Cost of Incorrect Coating Weight and Negative Tolerance in Galvanized Tube Procurement
Ordering galvanized tubes based on price per ton alone often leads to receiving product with zinc coating below Z30 or wall thickness at the extreme negative end of tolerance — both scenarios create field failures that cost far more than the initial savings. Coating below specification means accelerated corrosion in outdoor environments, requiring premature repainting or replacement; excessive negative tolerance means the tube cannot carry its design load, triggering structural safety concerns and potential project shutdowns [NEED_CITE: consequences of negative tolerance in structural steel hollow sections]. Third-party inspection by SGS or BV before shipment verifies both coating weight and dimensional accuracy, protecting the buyer from accepting substandard material that will fail at destination.
Why Project Procurement Teams Choose SD XJY Pipe for Galvanized RHS/SHS
As the original inventor of sharp-corner rectangular tubes in China with 41 invention patents, we understand that structural performance starts from precise manufacturing — our 3 production lines cover 2,800+ specifications including thin-wall galvanized tubes in 1.0–2.0 mm thickness, eliminating the need to source from multiple suppliers for different size requirements. Every Galvanized Rectangular Steel Tube leaving our facility carries mill test certificates documenting chemical composition and mechanical properties, with CE certification under EN 10210 and EN 10219 ensuring smooth customs clearance for European projects. Our professional container loading team uses anti-damage measures specifically designed for galvanized surfaces, preventing zinc coating scratches and edge dents that occur during ocean transit. Custom non-standard sizes and lengths are available with low MOQ, supporting projects that require specific dimensions without paying premium prices for small batch production.
Documentation & Compliance
- Mill test certificate documenting Q235/S235/S355 chemical composition and mechanical properties per EN 10219
- CE certificate covering EN 10210 structural hollow sections and EN 10219 cold-formed welded sections for EU market access
- ISO 9001:2015 quality management system certificate covering full production process from raw material to finished galvanized tubes
- SGS or BV third-party inspection report verifying zinc coating weight Z30–Z60 and dimensional tolerance ±1%
- Material traceability by heat number linking each tube bundle to specific steel grade and galvanizing batch
- Complete customs documentation including packing list, bill of lading, and certificate of origin for destination clearance
Packaging, Loading & Delivery
- Galvanized rectangular tubes bundled with steel strips and edge protectors to preserve zinc coating during ocean transit
- Surface protection maintained through proper stacking separation and anti-friction materials between tube layers
- Container loading optimized for 6 m and 12 m lengths with weight distribution calculated for maximum payload without overloading
- Custom cutting to project-specific lengths available, reducing on-site waste and handling requirements
- Heat number and steel grade marked on each tube bundle for site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with professional export documentation and tracking until arrival
How to Request Quotation and Technical Documentation for Your Project
Submit your required dimensions, steel grade, surface treatment preference, and quantity to receive detailed pricing with mill test certificate samples and CE documentation confirmation. For non-standard sizes outside the 1.0–2.0 mm wall thickness range or lengths beyond 12 m, our technical team provides custom manufacturing solutions with typical production lead times. Confirm third-party inspection requirements and shipping terms to ensure full compliance with your project specifications and destination port regulations.
Frequently Asked Questions
Q: How do Q235, S235JR, and STK400 compare across GB, EN, and JIS standards?
A: These grades share similar yield strength ranges and carbon equivalents, making them largely interchangeable for structural framing applications. Q235B and S235JR both meet minimum 235 MPa yield strength requirements, while STK400 provides comparable performance for general structural use. Our mill test certificates document the actual chemical composition and mechanical properties for each grade, allowing engineers to verify equivalence for their specific design codes.
Q: What is the difference between regular spangle and zero spangle galvanized finish?
A: Regular spangle shows visible crystalline zinc patterns on the surface, suitable for industrial applications where appearance is not critical. Zero spangle provides a uniform matte finish with minimal visible pattern, preferred for architectural facades and visible structural elements where consistent appearance matters. Both finishes provide the same Z30–Z60 coating weight and corrosion protection performance.
Q: Can you produce non-standard dimensions or wall thicknesses outside the 1.0–2.0 mm range?
A: Yes, our 3 production lines cover 2,800+ specifications including wall thicknesses up to 40 mm and custom non-standard sizes. For galvanized rectangular tubes requiring thickness outside 1.0–2.0 mm or special dimensions, we provide custom manufacturing solutions with low MOQ requirements. Contact our technical team with your specific requirements for detailed feasibility assessment and pricing.
Q: How are galvanized tubes packed to prevent coating damage during ocean freight?
A: Tubes are bundled with steel strips and protected with edge guards and separation materials to prevent zinc coating scratches and edge dents. Professional container loading follows anti-damage protocols specifically designed for galvanized surfaces, ensuring the coating arrives intact at destination. Third-party inspection can verify packaging quality before shipment.
Q: Do your products carry CE marking under EN 10210/10219 for European construction projects?
A: Yes, our galvanized square and rectangular steel tubes carry CE certification under both EN 10210 for structural hollow sections and EN 10219 for cold-formed welded sections. This certification ensures compliance with European construction product regulations and enables smooth customs clearance for EU member states. Full documentation including Declaration of Performance and factory production control certificates are provided with each shipment.
Request Galvanized Rectangular Steel Tube Quotation with Mill Test Certificate
Send your project specifications including dimensions, steel grade, quantity, and destination port to receive detailed pricing with technical documentation confirmation.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjypipe.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
