Description
Factory-Direct Galvanized SHS/RHS — Every Q195-S355JR galvanized square and rectangular steel tube ships with original mill test certificates and Lloyd’s CE compliance, eliminating middlemen markups on bulk structural orders.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square Hollow Section (SHS) / Rectangular Hollow Section (RHS) |
| Steel Grade | Q195, Q235, Q345, S235JR, S275JR, S355JR, S355J2H, ASTM A500 Grade A/B/C, SS400, STK400, ST42.2 |
| Standard | ASTM A53, ASTM A500, BS 1387, EN 10255, EN 10219, EN 10210, ISO 65, DIN 2440, JIS G3444, JIS G3466, GB/T 3091, GB/T 6728 |
| Section Shape | Square / Rectangular |
| Size Range | 21.3 mm – 660 mm (1/2″ – 26″) |
| Wall Thickness | 0.5 – 50 mm |
| Length | 5.8 m / 6 m / 11 m or customized |
| Technique | Hot-dip Galvanized / Pre-galvanized (ERW base pipe) |
| Surface Treatment | Hot-dip Galvanizing |
| Tolerance | ±1% |
| Pipe Ends | Plain ends / Beveled ends / Threaded ends / Grooved ends |
| Application | Steel structures / Municipal water supply / Fluid transport / Scaffolding / Building industry |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, column supports, roof trusses, scaffolding systems |
| Municipal Engineering | Water supply pipelines, drainage structures, street lighting poles |
| Industrial Facilities | Conveyor structures, equipment support frames, workshop mezzanines |
| Agricultural & Commercial | Greenhouse frames, warehouse racking, fencing posts |
When Zinc Coating Thickness Decides Project Acceptance
A 45-micron coating on an 80-micron contract specification means the entire container sits at port until rework is completed.
Global buyers procuring galvanized square and rectangular steel tube for municipal water or outdoor structural projects consistently encounter three procurement failures: zinc coating falling below contract-mandated thickness after third-party inspection at destination port, mill test certificates missing heat number traceability required for EU customs clearance, and fragmented sourcing across pipe, plate, and section suppliers creating delivery coordination delays. These are not theoretical risks — they represent the difference between a project passing structural验收 on schedule and facing weeks of demurrage charges plus acid-stripping rework costs. [NEED_CITE: hot-dip galvanizing coating thickness standards for structural hollow sections]
Matching Corrosion Protection to Municipal and Structural Environments
Hot-dip galvanizing on Q235 and S355JR grades provides the corrosion resistance that municipal water supply networks and outdoor scaffolding structures demand. The zinc metallurgical bond formed during immersion at approximately 450°C outperforms pre-galvanized coatings in buried or splash-zone conditions, which is precisely why specifiers for galvanized square and rectangular steel tube on infrastructure projects increasingly demand hot-dip treatment with coating thickness verified by magnetic film gauges before shipment. Our production lines run simultaneous hot-dip galvanizing across the full 21.3 mm to 660 mm size range, meaning a single order covering both small-bore water line sections and large structural columns ships together with uniform coating quality.
Structural Compliance and Certification Pathways
Load-bearing applications for galvanized square and rectangular steel tube must satisfy EN 1993 structural design codes or AISC equivalents, which requires documented proof that steel grade chemistry and mechanical properties conform to EN 10219 (cold-formed welded) or EN 10210 (hot-finished welded) standards. For European market entry, Lloyd’s CE certification under EN 10210/10219 is not optional — it determines whether the shipment clears customs or sits bonded at the port. The S355JR and S355J2H grades we supply carry Charpy impact testing at -20°C for low-temperature structural applications, while ASTM A500 Grade B/C serves North American specifiers requiring equivalent yield performance. [NEED_CITE: EN 10219 cold-formed hollow section structural requirements]
Steel Grade Selection and Galvanizing Process Fundamentals
The Q-series (Q195, Q235, Q345) represents Chinese GB standards where the number indicates minimum yield strength in MPa; S235JR, S275JR, and S355JR follow European EN nomenclature with JR denoting room-temperature impact toughness; ASTM A500 Grade A/B/C serves the North American market with progressively higher strength requirements. For galvanized square and rectangular steel tube, the ERW (Electric Resistance Welded) base pipe process dominates the 21.3 mm to 406 mm range because it delivers consistent weld integrity at competitive cost, while hot-dip galvanizing adds 45–85 microns of zinc coating depending on immersion duration and steel chemistry. Wall thickness tolerance of ±1% matters structurally: a 3.0 mm nominal wall at -1% tolerance still meets EN 10219 requirements, but suppliers running excessive negative tolerance can reduce actual load capacity below design calculations. [NEED_CITE: steel grade equivalence between GB, EN, and ASTM standards]
Hidden Costs of Under-Specified Galvanized Procurement
Ordering galvanized square and rectangular steel tube without specifying zinc coating thickness in microns, or accepting “galvanized” without requiring mill test certificates with heat number traceability, creates downstream failures: destination port SGS inspection revealing substandard coating triggers return-or-rework decisions, missing CE documentation blocks EU customs clearance regardless of product quality, and wall thickness at extreme negative tolerance passes mill inspection but fails structural engineer load calculations on site. These are not quality disputes — they are specification and documentation failures that delay project handover by weeks and generate demurrage, re-acid-washing, and re-shipping costs that exceed the original material price difference between qualified and unqualified suppliers. [NEED_CITE: consequences of incomplete mill certification for steel imports]
Why Bulk Buyers Source Galvanized SHS/RHS Directly from Our Factory
Three production lines running simultaneously deliver monthly capacity exceeding 20,000 tons of galvanized square and rectangular steel tube, with 2,800+ specifications held in ready stock for urgent dispatch. Factory-direct pricing eliminates trading company margins, and volume discount programs reward long-term partners with recurring procurement commitments. Every batch ships with original mill test certificates documenting chemical composition and mechanical properties per EN 10219 or ASTM A500, while Lloyd’s CE certification under EN 10210/10219 ensures European customs compliance without additional testing. Third-party SGS or BV inspection is available on request for buyers requiring independent verification before container sealing. Professional export teams optimize container loading plans for mixed-size galvanized tube shipments, reducing per-ton freight costs on consolidated orders spanning square sections, rectangular sections, and complementary steel products.
Documentation & Compliance
- Mill test certificate documenting S355JR chemical composition and yield strength per EN 10219, with heat number traceability for each bundled length
- Lloyd’s CE certificate confirming EN 10210/10219 compliance for hot-dip galvanized structural hollow sections entering European markets
- ISO 9001:2015 quality management certification covering production, galvanizing, and inspection processes across all three production lines
- SGS or BV third-party inspection report verifying zinc coating thickness, dimensional tolerance, and bundle quantity before container departure
- Material traceability documentation linking each heat number to specific steel grade (Q235, S355JR, ASTM A500) and galvanizing batch records
- Complete customs documentation package including packing list, bill of lading, and certificate of origin formatted for destination port requirements
Packaging, Loading & Delivery
- Hot-dip galvanized square and rectangular tubes bundled with steel strips and edge protectors to preserve zinc coating integrity during ocean transit and handling
- Plastic end caps installed on all plain-end and beveled-end galvanized SHS/RHS to prevent moisture ingress and internal corrosion before installation
- Container loading plans optimized for mixed-size shipments combining 21.3 mm small-bore sections with 406 mm structural columns, maximizing weight utilization within 20ft and 40ft containers
- Custom cut-to-length service available for 5.8 m, 6 m, and 11 m standard lengths, with saw-cut precision for工地 direct-installation requirements
- Heat number and steel grade stenciled on each bundle surface for site identification and mill test certificate cross-referencing during project inspection
- FOB, CIF, and DDP shipping terms available with professional documentation handling for customs clearance at destination ports across 50+ countries
Initiating Your Galvanized Tube Procurement
Submit your specification requirements — including section dimensions, wall thickness, steel grade preference (Q235/S355JR/ASTM A500), total tonnage, and destination port — via email or WhatsApp to receive competitive bulk pricing within 12 hours. Requests for non-standard sizes, custom lengths, or specific zinc coating thickness requirements receive detailed technical responses confirming production feasibility and lead times. Buyers requiring mill test certificates, CE documentation, or third-party inspection confirmation before contract signing can request sample documentation packages during the inquiry stage.
Frequently Asked Questions
Q: What zinc coating thickness can you guarantee for hot-dip galvanized square and rectangular steel tube?
A: Hot-dip galvanizing typically produces 45–85 microns depending on steel grade chemistry and immersion duration. We verify coating thickness with magnetic film gauges before shipment and document results in mill test certificates. Specific coating requirements (e.g., minimum 80 microns for marine environments) can be confirmed during quotation.
Q: Can you supply galvanized SHS/RHS with both EN and ASTM certifications for projects requiring dual-standard compliance?
A: Yes. Our Lloyd’s CE certification covers EN 10210 and EN 10219 for European markets, while ASTM A500 Grade A/B/C production meets North American specifications. Mill test certificates document compliance with the specific standard you require, and we can supply dual-certified material when project specifications call for either standard.
Q: What is the minimum order quantity for non-standard sizes outside your 2,800+ ready stock specifications?
A: We accept trial orders from 1 ton for standard specifications held in ready stock. Custom non-standard sizes or specialized steel grades typically require minimum production runs, but we work with buyers to consolidate orders across multiple specifications to meet feasible production thresholds.
Q: Do you provide third-party inspection before container loading?
A: Yes. SGS and BV third-party inspection services are available on request for buyers requiring independent verification of zinc coating thickness, dimensional accuracy, bundle quantity, and documentation before shipment. Inspection scheduling is coordinated during the production confirmation stage.
Q: How do you optimize container loading for mixed-size galvanized tube shipments?
A: Our export team develops loading plans that combine small-bore sections (21.3–76 mm) with large structural sections (up to 660 mm) to maximize weight utilization within container limits. This consolidation approach reduces per-ton freight costs for buyers ordering multiple specifications in a single shipment.
Request Your Galvanized SHS/RHS Quotation with Mill Test Certificates
Submit section dimensions, steel grade, quantity, and destination port to receive factory-direct pricing and compliance documentation within 12 hours.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Email: admin@sdxinjiyuan.com
Mobile/WhatsApp: +86 188 5315 7756
Tel: +86 531 8573 6315
