Description
Factory-Direct Galvanized Tubes — Hot dip galvanized square and rectangular steel tubes produced from our own steel mill with full material traceability from raw coil to finished section.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Hot Dip Galvanized Square / Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | SPCC, DC01, DC02, DC03, DC04 |
| Standard | JIS, DIN, ASTM, ISO 9001 |
| Section Shape | Square / Rectangular |
| Size Range | 20×20mm – 200×200mm |
| Wall Thickness | 1.0 – 6.0mm |
| Length | 1 – 12m (6m / 6.4m / 12m available) |
| Technique | Welded (ERW) |
| Surface Treatment | Hot Dip Galvanized |
| Zinc Coating | 30 – 275g/m² |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Structure Pipe / Construction Frames / Scaffolding / Machinery / Furniture / Fluid Pipe / Gas Pipe |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Commercial Construction | Building frames, column supports, roof truss systems |
| Industrial Facilities | Factory structures, equipment platforms, conveyor supports |
| Infrastructure | Scaffolding systems, bridge handrails, signage structures |
| Machinery Manufacturing | Equipment frames, protective guards, structural bases |
| Furniture Production | Display racks, shelving systems, modular furniture frames |
What Zinc Coating Thickness Means for Long-Term Corrosion Protection
Hot dip galvanizing with 30–275g/m² zinc coating determines service life in corrosive environments — not just initial appearance.
When sourcing a Hot Dip Galvanized Square Rectangular Steel Tube Supplier for outdoor structures or industrial facilities, coating thickness directly impacts how long the steel resists white rust and red rust formation. Thin coatings below 60g/m² may pass visual inspection at the factory but deteriorate rapidly in humid or coastal climates. Buyers who accept unspecified zinc coating ranges often face premature corrosion claims from end clients, especially on projects exposed to chemical fumes or marine atmospheres. [NEED_CITE: hot dip galvanized coating thickness standards for structural steel]
Matching Tube Dimensions to Structural Load Requirements
Selecting the correct Hot Dip Galvanized Square Rectangular Steel Tube requires balancing section modulus against actual load conditions. The 20×20mm to 200×200mm size range covers everything from light-duty furniture frames to heavy industrial support columns. For scaffolding and temporary structures, smaller sections with adequate wall thickness provide sufficient rigidity while keeping weight manageable for assembly crews. Our fabrication workshop reviews engineering drawings to recommend optimal section sizes, ensuring the galvanized tubes meet both structural calculations and connection detail requirements without over-specification.
Engineering Compliance and Certification Requirements
Structural applications demand compliance with recognized standards — EN 10219 for cold-formed welded structural hollow sections in European markets, ASTM A500 for North American projects, and JIS G3466 for Japanese-specification work. The SPCC and DC01–DC04 steel grades used in these Hot Dip Galvanized Square Rectangular Steel Tube products conform to forming and welding requirements across these standard systems. Third-party inspection from SGS or BV verifies coating thickness, dimensional accuracy, and weld integrity before shipment. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerances] Mill test certificates document chemical composition and mechanical properties per heat number, providing full traceability for engineering approvals and customs clearance.
Understanding Steel Grade Selection for Galvanized Tubes
The SPCC and DC01–DC04 steel grades represent commercial quality and drawing quality classifications under JIS standards, optimized for cold forming and welding rather than high-strength structural applications. SPCC offers general-purpose formability suitable for standard brackets and frames, while DC01 through DC04 provide progressively better drawing characteristics for complex bent sections. These grades work well with hot dip galvanizing because their low carbon content minimizes coating reactivity issues that can cause bare spots or excessive dross formation. The ERW welding process creates a continuous longitudinal seam that, when properly processed, maintains coating continuity across the weld zone. Wall thickness tolerance of ±1% ensures predictable weight calculations and structural performance, invoiced by theoretical weight for transparent cost control.
Hidden Costs of Unverified Galvanized Tube Procurement
Purchasing Hot Dip Galvanized Square Rectangular Steel Tube without verified coating thickness and material certification creates risks that surface only after delivery. Coating below specification leads to accelerated corrosion, forcing costly replacement or supplementary painting on site. Material grade substitutions may pass visual inspection but fail mechanical testing during structural audits, triggering project delays and engineering re-approvals. Missing mill test certificates block customs clearance in markets requiring EN 10210 or ASTM compliance documentation. [NEED_CITE: material certification requirements for structural steel imports] Dimensional inaccuracies beyond ±1% tolerance create fitting problems during assembly, requiring field cutting and re-welding that compromises the galvanized coating at joint locations.
Why Source from an Integrated Steel Producer
Our Hot Dip Galvanized Square Rectangular Steel Tube production starts from our own steel mill with over 2,800 raw material specifications in inventory, eliminating the traceability gaps that occur when fabricators source steel from third-party suppliers. The vertical integration from raw coil to finished galvanized tube means one quality system controls the entire process — from steelmaking chemistry through ERW welding to hot dip galvanizing bath management. Our fabrication workshop holds certified welding procedures and qualified welders under AWS and EN standards, with complete documentation packages including WPS, PQR, weld maps, and dimensional inspection reports. We serve general contractors and EPC firms across the Middle East, Southeast Asia, and Africa who require reliable fabrication partners with single-source accountability. Professional loading teams handle oversized cargo and complex container optimization, with full export documentation prepared for destination-country requirements.
Documentation & Compliance
- Mill test certificate documenting SPCC and DC01–DC04 chemical composition and mechanical properties per JIS standards, with heat number traceability
- ISO 9001 quality management system certificate covering the complete production process from steelmaking through galvanizing
- SGS or BV third-party inspection report verifying zinc coating thickness (30–275g/m²), dimensional accuracy, and weld quality
- Material traceability documentation linking each bundle to specific heat numbers and production dates
- Complete customs documentation package including packing list, bill of lading, and certificate of origin
- Welding procedure specifications (WPS) and procedure qualification records (PQR) for structural applications requiring certified fabrication
Packaging, Loading & Delivery
- Hot dip galvanized tubes bundled with steel strips and edge protectors to preserve zinc coating integrity during ocean transit
- Seaworthy packaging with waterproof wrapping for containers, preventing moisture condensation that causes white rust formation
- Container loading optimization for 6m and 12m lengths, maximizing payload while maintaining weight distribution for port handling
- Plain ends protected with plastic caps to prevent coating damage and contamination during transport
- Heat number and steel grade markings stenciled on each bundle for site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with professional oversized cargo handling for large-diameter sections
Getting Accurate Quotes for Your Project
Submit your engineering drawings or specifications including section sizes, wall thickness requirements, steel grade preferences, zinc coating needs, and destination port to receive detailed pricing with production timelines. Our technical team reviews shop drawings to confirm dimensional feasibility and suggests material optimizations before contract signing. We provide complete mill test certificates and third-party inspection coordination for projects requiring engineering approval documentation.
Request Your Hot Dip Galvanized Square Rectangular Steel Tube Quote Today
Share your project specifications — section dimensions, wall thickness, steel grade, coating requirements, and quantity — to receive pricing with mill test certificates and production schedules.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
