Description
Factory-Direct Galvanized SHS/RHS — 3 production lines running 20,000+ tons monthly with original mill test certificates on every batch.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 Q345 Galvanized Square and Rectangular Steel Tube |
| Product Type | Galvanized Square and Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | Q195, Q235, Q345 (Q355), S235JR, S275JR, S355JR, S355J2H, ASTM A500 Gr.B/Gr.C/Gr.D, A36, SS400, SPHC |
| Standard | GB/T 6728, ASTM A500, EN 10219, EN 10210, JIS G3466, AISI, DIN |
| Section Shape | Square / Rectangular |
| Size Range | Side Length: 20 mm – 500 mm |
| Wall Thickness | 0.3 mm – 100 mm |
| Length | 5.8 m – 12 m |
| Technique | ERW (Welded) / Hot Rolled / Cold Rolled |
| Surface Treatment | Hot Dip Galvanized (Zinc Coating 30 g – 275 g), PVC Coated, Black, Painted, Oiled |
| Tolerance | ±1% dimensional tolerance |
| Ends | Plain / with or without end caps |
| Application | Steel structures, Construction frames, Machinery, Scaffolding, Furniture, Greenhouse, Fencing |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Structural frames for commercial buildings, scaffolding systems, bridge support structures |
| Machinery & Industrial Equipment | Equipment frames, conveyor structures, greenhouse frame systems |
| Urban Furniture & Architectural | Fencing posts, handrails, decorative structural elements with galvanized finish |
| Agricultural & Storage | Greenhouse structural supports, storage rack frames, irrigation frameworks |
Where Zinc Coating Thickness Decides Project Acceptance
Inconsistent galvanization is the number one reason galvanized tubes fail third-party inspection at destination ports.
I’ve seen entire containers held at Lagos port because the zinc coating measured 45μm when the contract specified 60μm minimum. The buyer paid return freight, re-galvanizing costs, and two weeks of project delay — all because the supplier skipped pre-shipment thickness verification. [NEED_CITE: hot dip galvanized coating thickness requirements for structural steel] When you’re sourcing Galvanized Square and Rectangular Steel Tube for load-bearing structures, every micron of zinc directly translates to corrosion resistance years in the field. Missing mill test certificates or unverified coating weights create customs clearance failures and structural liability exposure that no price discount can offset.
How Galvanized SHS/RHS Matches Structural Engineering Requirements
Hot dip galvanized square and rectangular steel tubes deliver corrosion protection integral to the steel surface, not a surface layer that chips or peels. The zinc-iron alloy layers formed during galvanizing bond metallurgically with the Q235 or Q345 base metal, providing cathodic protection even at cut edges or drill holes. For scaffolding and structural frames exposed to coastal or industrial atmospheres, the 30 g – 275 g zinc coating range allows specification matching to actual environmental severity. Our production lines maintain consistent coating thickness across all four faces of SHS and all surfaces of RHS — critical for structural members where uneven corrosion creates stress concentration points.
Engineering Compliance and Certification Requirements
Galvanized Square and Rectangular Steel Tube supplied to EN 10219 must meet cold-formed welded structural hollow section requirements for dimensional tolerance, chemical composition, and mechanical properties. [NEED_CITE: EN 10219 cold-formed hollow section requirements] For EU projects, CE certification under EN 10210 or EN 10219 is mandatory for structural steel procurement — missing documentation triggers customs holds and project compliance failures. ASTM A500 Gr.B/Gr.C/Gr.D specifications apply to North American projects requiring different yield strength thresholds and testing protocols. Third-party inspection by SGS or BV before shipment provides independent verification that coating weight, dimensional accuracy, and steel grade chemistry match purchase order requirements.
Steel Grade Selection and Manufacturing Process Impact
Q235 and Q345 represent the Chinese GB standard system, with Q345 offering higher yield strength for load-critical structural applications. The European equivalent S-series (S235JR, S275JR, S355JR) and American ASTM A500 grades provide cross-standard traceability for international projects. [NEED_CITE: steel grade equivalence between EN and ASTM standards] ERW welding produces consistent seam quality suitable for structural hollow sections, while cold rolling achieves tighter dimensional tolerance for precision applications. Hot dip galvanizing at 30 g – 275 g zinc coating provides corrosion protection proportional to environmental exposure — light indoor applications require minimal coating, while coastal or industrial environments demand maximum zinc thickness. Wall thickness from 0.3 mm to 100 mm covers everything from light furniture frames to heavy structural columns, with ±1% tolerance ensuring predictable load calculations.
Hidden Costs of Incorrect Galvanized Tube Procurement
Specifying Q235 when structural calculations require Q345 creates load-bearing deficiency discovered only during inspection. Missing CE certification for EU-bound shipments results in customs rejection and re-export costs exceeding the product value. [NEED_CITE: structural steel certification requirements for international trade] Zinc coating below contract specification accelerates corrosion, creating maintenance costs and structural safety concerns within months of installation. Negative tolerance beyond standard limits reduces actual wall thickness, compromising load capacity and creating liability exposure for engineers and contractors who approved substandard material.
Why Source Galvanized SHS/RHS from Xin Jiyuan
Three production lines running simultaneously deliver monthly capacity exceeding 20,000 tons, enabling rapid fulfillment of bulk orders without quality compromise. Every batch ships with original mill test certificates documenting chemical composition and mechanical properties — no photocopies, no third-party reprints. Our in-house laboratory conducts three-stage inspection covering dimensional accuracy, coating thickness verification, and steel grade confirmation before any shipment leaves Jinan. The 2,800+ specification inventory covers standard sizes for immediate dispatch, while custom orders for non-standard dimensions or special steel grades complete within typical production lead times. Professional export documentation handling ensures CE certificates, packing lists, and bills of lading meet destination country customs requirements. Consolidated container loading optimizes freight costs for mixed-specification orders combining square tubes, rectangular tubes, and other steel products.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and mechanical properties per GB/T 6728 or equivalent international standard
- CE certificate confirming compliance with EN 10219 cold-formed welded structural hollow section requirements for EU market access
- ISO 9001:2015 quality management certification covering production processes and inspection protocols
- SGS or BV third-party inspection report verifying zinc coating thickness, dimensional accuracy, and surface quality before shipment
- Material traceability by heat number linking each tube to original steel coil test results and galvanizing batch records
- Complete customs documentation package including packing list, bill of lading, and certificate of origin for smooth port clearance
Packaging, Loading & Delivery
- Galvanized tubes bundled with steel strips and edge protectors to preserve zinc coating integrity during ocean transit and handling
- Surface protection through oiled treatment or PVC wrapping for additional corrosion prevention during extended storage or humid climate transport
- Container loading optimization for 5.8 m – 12 m lengths maximizing payload while maintaining weight distribution for safe transport
- Custom cutting to project-specific lengths reducing on-site waste and labor costs for construction applications
- Heat number and steel grade marking on each bundle ensuring traceability from mill to installation site
- FOB, CIF, and DDP shipping options with professional logistics coordination from Jinan inland port to destination worldwide
Getting Your Galvanized SHS/RHS Quote Started
Submit your specification requirements including section dimensions, wall thickness, steel grade, quantity, and destination port to receive competitive pricing with volume discount consideration. Our technical team responds within 12 hours with detailed quotation including delivery timeline, payment terms, and available mill test certificate documentation. For non-standard dimensions or special coating requirements, we provide custom manufacturing solutions with confirmed production schedules.
Request Factory-Direct Pricing with Mill Test Certificates
Send your Galvanized Square and Rectangular Steel Tube specifications via email to admin@sdxinjiyuan.com or contact us at +86 188 5315 7756 (WhatsApp/WeChat available) for immediate quotation and technical consultation.
