Description
Factory-Direct Galvanized Tubes — Hot-dip galvanized square and rectangular steel tubes produced in-house from ERW and seamless base pipes, shipped with full mill test certificates.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Galvanized Square and Rectangular Steel Tube |
| Steel Grade | Q195–Q690, S235JR–S355J2, ASTM A500 Gr.A/B/C/D, JIS G3466 STKR400/490, AS1163 C350/C350L0 |
| Standard | EN 10219, EN 10210, ASTM A500, JIS G3466, AS1163, GB/T 6728 |
| Section Shape | Square / Rectangular (including sharp-corner / right-angle rectangular tube) |
| Size Range | 2,800+ specifications available |
| Wall Thickness | Up to 40 mm |
| Length | 6 m / 12 m or customized |
| Technique | Hot-dip Galvanized over ERW / Seamless base tube |
| Surface Treatment | Hot-dip Galvanizing |
| Tolerance | Per EN 10219 / ASTM A500 standard tolerance |
| Ends | Plain / Beveled / Threaded |
| Application | Steel structures, glass curtain walls, architectural facades, machinery frames, scaffolding, industrial platforms, infrastructure |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & EPC | Building frames, bridge supports, infrastructure scaffolding |
| Architectural Facades | Glass curtain wall framing, exposed structural columns, decorative sharp-corner profiles |
| Machinery Manufacturing | Equipment frames, conveyor structures, industrial platform supports |
| Steel Structure Fabrication | Column and beam assemblies, truss components, load-bearing brackets |
What Rounded Corners Cost on a Facade Order
Standard galvanized rectangular tubes leave R≥2t corner radii that break sightlines on glass curtain walls and force costly rework.
When architects specify clean 90-degree edges for exposed facade framing, conventional hollow sections create visible gaps at welded joints and misaligned mullion connections. Sourcing true sharp-corner galvanized tubes from a single qualified mill eliminates the mismatch between design intent and delivered geometry. Most traders stock only popular sizes, leaving projects to piece together orders from multiple suppliers with inconsistent zinc coating and dimensional tolerance. [NEED_CITE: cold-formed steel hollow section dimensional tolerance standards]
Matching Galvanized Profiles to Structural and Aesthetic Demands
Hot-dip galvanized square and rectangular steel tubes with sharp-corner geometry serve dual roles: load-bearing capacity for steel frames and visual precision for architectural facades. The zinc coating protects against atmospheric corrosion in outdoor and humid environments, while the right-angle profile ensures flush contact at welded or bolted connections — critical for curtain wall sub-frames where millimeter deviations compound across floor heights. Our patented sharp-corner process produces true 90-degree edges across wall thicknesses up to 40 mm, covering both light architectural members and heavy structural columns in a single supply source.
Engineering Compliance and Certification Requirements
Structural galvanized tubes for EU projects must carry CE marking per EN 10210 or EN 10219, with Declaration of Performance documentation traceable to production heat numbers. North American projects typically require ASTM A500 conformance with mill test certificates showing chemical composition and mechanical test results per A500 Gr.B or Gr.C. Australian infrastructure tenders reference AS1163 C350/C350L0, while Middle East and Southeast Asian projects often accept GB/T 6728 or JIS G3466 equivalents. [NEED_CITE: EN 10219 cold-formed structural hollow section certification requirements] Wall thickness tolerance directly affects theoretical weight calculations and load-bearing design — negative tolerance beyond standard limits reduces actual section modulus and may fail structural verification on site.
Steel Grade Selection and Galvanizing Process
The Q-series (Q195–Q690) follows Chinese GB standards with increasing yield strength for heavier structural loads, while S235JR–S355J2 per EN 10219 serves European structural design with defined impact toughness at sub-zero temperatures. ASTM A500 Gr.A through Gr.D provides North American projects with tiered strength and ductility options. Hot-dip galvanizing over ERW or seamless base tubes creates a metallurgical zinc-iron bond layer that outperforms pre-galvanized (electro-galvanized) coatings in corrosion resistance and edge protection. The sharp-corner rectangular tube forming process — holding 41 invention patents — achieves true right-angle edges without cracking the zinc layer at corner radii, a common failure point in conventional cold-forming followed by galvanizing. Wall thickness up to 40 mm covers heavy structural applications where standard commercial tubes top out at 12–16 mm.
Hidden Costs of Incorrect Procurement
Ordering galvanized tubes without verified mill test certificates risks material substitution — lower-grade steel delivered as S355JR fails structural load testing and triggers full replacement at project expense. Missing CE documentation blocks EU customs clearance, causing demurrage charges and schedule delays. Zinc coating thickness below specification accelerates corrosion in coastal or industrial atmospheres, leading to premature maintenance or structural degradation. [NEED_CITE: steel grade equivalence between EN ASTM and GB standards] Non-standard sizes sourced from multiple traders arrive with inconsistent lengths, end finishes, and dimensional tolerances, forcing on-site cutting and re-welding that compromises galvanized protection at cut edges.
Why Source from SD XJY Pipe
We operate three production lines covering 2,800+ specifications in square, rectangular, and round profiles — eliminating the need to coordinate multiple suppliers for mixed-size orders. Our in-house physical and chemical laboratory issues mill test certificates for every heat number, with third-party SGS or BV inspection available before shipment. The patented sharp-corner rectangular tube technology — China’s original inventor — delivers true 90-degree edges for architectural applications where conventional tubes leave rounded corners. Full international certifications include ISO 9001:2015, Lloyd’s CE per EN 10210/EN 10219, Singapore FPC, and SGS/BV verification for regulated market exports to 50+ countries. Custom non-standard sizes, cutting, marking, and professional container loading with anti-damage measures are standard for export orders.
Documentation & Compliance
- Mill test certificate documenting Q355B / S355JR chemical composition and mechanical properties per EN 10219 or GB/T 6728
- CE certificate per EN 10210 / EN 10219 for EU market structural hollow section compliance
- ISO 9001:2015 quality management system certificate covering production and testing processes
- SGS or BV third-party inspection report verifying dimensions, zinc coating thickness, and surface quality
- Material traceability by heat number linking each bundle to production and test records
- Customs documents including packing list, bill of lading, and certificate of origin for destination clearance
Packaging, Loading & Delivery
- Galvanized tubes bundled with steel strips and edge protectors to preserve zinc coating during ocean transit
- Sharp-corner rectangular tubes separated by timber spacers to prevent corner damage and surface scratching
- Container loading optimized for 6 m / 12 m lengths with anti-rust treatment on cut ends and threaded connections
- Heat number and steel grade stenciled on each bundle for site identification and traceability
- FOB / CIF / DDP shipping terms with professional tube and beam loading for mixed-size export orders
Start Your Procurement Process
Submit your specification sheet — including section shape, dimensions, steel grade, surface treatment, quantity, and destination port — to receive a detailed quotation with unit pricing, lead time, and shipping terms within 12 hours. Request mill test certificates and third-party inspection arrangements for quality confirmation before production.
Request a Quote with Mill Test Certificates
Send your specifications to admin@sdxjypipe.com or contact via WhatsApp at +86 188 5315 7756 for pricing, certification documents, and delivery scheduling.
