Description
Factory-Direct Galvanized SHS/RHS Supply — Shandong Xin Jiyuan Special Steel Tube Co., Ltd operates three production lines with 2,800+ specifications in ready stock, enabling bulk procurement without middlemen markups.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 Galvanized Square and Rectangular Steel Tube |
| Product Type | Galvanized Square and Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | Q195, Q235, Q345, S235, S355, STK400, STK500 |
| Standard | GB, ASTM, API, CE, ISO 9001, JIS |
| Section Shape | Square / Rectangular |
| Size Range | 20mm–100mm side length |
| Wall Thickness | 1.0–2.0 mm |
| Length | 6–12 m |
| Technique | Hot Rolled Based |
| Surface Treatment | Galvanized Zinc (Z30–Z60 coating) |
| Spangle Type | Zero Spangle / Regular Spangle |
| Tolerance | ±1% |
| Ends | Plain |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Hardness | Hard / Mid Hard |
| Oiled or Non-oiled | Non-oiled |
| Application | Steel structures, Construction frames, Fencing, Container manufacturing |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, scaffolding supports, structural columns |
| Manufacturing | Container frames, corrugated sheet production, machinery bases |
| Agriculture & Fencing | Perimeter fencing posts, greenhouse structures, equipment enclosures |
| Industrial Fabrication | Small tool frames, conveyor supports, warehouse racking systems |
Where Galvanized Coating Thickness Decides Project Acceptance
Z30 versus Z60 zinc coating determines whether your tubes survive six months or six years in humid environments.
I once watched a Southeast Asian warehouse project reject an entire container of galvanized tubes because the zinc coating measured 40 microns instead of the specified 60. The supplier claimed “industry standard,” but the project specification required minimum Z60 for tropical humidity resistance. Every tube was returned, shipping costs doubled, and the project delayed three weeks. When sourcing a Galvanized Square and Rectangular Steel Tube Supplier, coating thickness verification is non-negotiable.
Wall thickness tolerance compounds the problem. A ±1% tolerance sounds precise until you realize that 1.0mm nominal wall can legally arrive at 0.99mm — but some mills push negative tolerance to 0.85mm, reducing load capacity and triggering structural engineer rejection. Third-party inspection and original mill test certificates eliminate this uncertainty. [NEED_CITE: galvanized coating thickness measurement standards ASTM B568]
Matching Wall Thickness to Structural Load Requirements
For construction frames and fencing structures, 1.0–1.5mm wall thickness handles typical non-load-bearing applications, while 1.5–2.0mm serves machinery bases and container frames where point loads concentrate. The hot-rolled base technique provides better dimensional consistency than cold-formed alternatives for these thickness ranges. As a Galvanized Square and Rectangular Steel Tube Supplier, we stock both thickness ranges across 20mm–100mm side lengths, allowing single-source procurement for mixed-specification projects.
Engineering Compliance and Certification Requirements
Structural applications in Europe require EN 10219 compliance for cold-formed welded structural hollow sections, while North American projects specify ASTM A500 Grade B or C. Our production carries CE certification covering EN 10210 and EN 10219, with ISO 9001:2015 quality management. Every batch includes original mill test certificates documenting chemical composition and mechanical properties per the specified standard. For projects requiring independent verification, SGS or BV third-party inspection is available at the production facility before shipment. [NEED_CITE: EN 10219 dimensional tolerance requirements]
Steel Grade Selection and Galvanizing Process
Q235 remains the workhorse grade for general construction in China and Southeast Asia, offering adequate strength for framing and fencing at competitive pricing. S235 and S355 serve European-specification projects where yield strength documentation must align with EN standards. The galvanizing process applies Z30 to Z60 zinc coating — Z30 suits indoor or sheltered applications, while Z60 provides extended corrosion resistance for outdoor exposure. Zero spangle finish delivers uniform appearance for architectural applications, while regular spangle offers cost efficiency for industrial use. Wall thickness tolerance of ±1% ensures theoretical weight calculations match actual delivered weight, preventing cost overruns on tonnage-based contracts.
Hidden Costs of Incorrect Material Specification
Specifying Q235 when the project requires S355 creates structural safety risks and potential liability exposure. Missing mill test certificates trigger customs delays in countries requiring proof of origin and material compliance. Negative tolerance abuse reduces actual load capacity below engineering calculations, forcing costly redesigns or complete replacement. As a Galvanized Square and Rectangular Steel Tube Supplier with in-house quality control, we conduct three-stage inspection before shipment: dimensional verification, coating thickness measurement, and visual surface examination. [NEED_CITE: steel grade equivalence between EN and ASTM standards]
Why Bulk Buyers Source From Shandong Xin Jiyuan
Factory-direct pricing eliminates trading company margins, with volume discounts available for long-term partners exceeding annual procurement thresholds. Our 2,800+ specification inventory covers standard sizes for immediate shipment, while custom orders complete within typical production lead times. Every production batch carries original mill test certificates, with SGS or BV third-party inspection available for projects requiring independent verification. Professional export documentation handling ensures customs clearance compliance across 50+ destination countries. Container loading optimization maximizes payload per shipment, reducing per-unit freight costs for bulk orders. Dedicated account management provides consistent communication and order tracking from inquiry through delivery.
Documentation & Compliance
- Mill test certificate documenting Q235 chemical composition and yield strength per GB standard
- CE certificate covering EN 10210 seamless hollow sections and EN 10219 welded hollow sections
- ISO 9001:2015 quality management system certificate for production processes
- SGS or BV third-party inspection report available for galvanized coating thickness verification
- Material traceability by heat number linking each tube to production batch records
- Complete customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Galvanized tubes bundled with steel strips and edge protectors to preserve zinc coating during ocean transit
- 6-meter and 12-meter lengths loaded in standard 20ft and 40ft containers with optimized weight distribution
- Heat number and steel grade markings stenciled on each bundle for site identification
- FOB Qingdao or CIF destination port terms available, with DDP service for select markets
- Custom cutting to project-specific lengths available before galvanizing to maintain coating integrity
Streamline Your Procurement With Complete Specifications
Submit your project specifications including side dimensions, wall thickness, steel grade, quantity, and destination port to receive competitive bulk pricing within 12 hours. Request mill test certificates and third-party inspection options for projects requiring compliance documentation. Our export team coordinates container loading optimization and complete shipping documentation for hassle-free customs clearance.
Start Your Bulk Inquiry Today
Provide your galvanized SHS/RHS specifications and receive factory-direct pricing with mill test certificates.
Contact Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxinjiyuan.com
Website: www.sdxinjiyuan.com
