Description
Direct Mill Supply for Galvanized SHS/RHS — Hot-dip galvanized square and rectangular steel tubes produced from our own raw steel, ensuring full material traceability and consistent zinc coating thickness from billet to finished bundle.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square and Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | S235, S275, Q235B |
| Standard | JIS, ISO, API (EN10219 / ASTM A500 available per request) |
| Section Shape | Square / Rectangular |
| Size Range | Customized Size |
| Length | 6 m / 12 m (or customized) |
| Technique | Hot-dip galvanizing |
| Surface Treatment | Hot-dip Galvanized |
| Tolerance | ±1% |
| Ends | Plain ends with plastic caps |
| Application | Steel structures / Construction frames / Machinery parts / Scaffolding / Fluid transport (low-pressure) |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Steel Structure Construction | Building frames, column-beam assemblies, portal frame warehouses |
| Industrial Infrastructure | Machinery bases, conveyor support structures, platform handrails |
| Scaffolding & Access | Scaffolding uprights, ledger braces, access tower components |
| EPC Projects (Middle East / SE Asia / Africa) | Warehouse purlins, solar mounting structures, pipe rack supports |
Coating Thickness Variance Between Hot-Dip and Pre-Galvanized SHS/RHS
Hot-dip galvanizing delivers 60–80μm zinc coating; pre-galvanized tubes typically offer only 20–30μm — a difference that determines service life in corrosive environments.
When procurement teams specify galvanized square and rectangular steel tubes for outdoor structural applications, the coating process matters more than the steel grade. Pre-galvanized (electro-galvanized) tubes are formed from already-coated strip, meaning the weld seam and cut edges remain unprotected. Hot-dip galvanizing immerses the fully fabricated tube in molten zinc, coating all surfaces including internal corners and weld zones. For projects in coastal Middle East or Southeast Asian sites, this distinction directly affects when rust staining appears and when structural maintenance becomes necessary [NEED_CITE: hot-dip galvanizing coating thickness standards for structural hollow sections].
Matching Galvanized SHS/RHS to Structural Frame Requirements
Galvanized square and rectangular steel tubes in S235 and S275 grades provide the combination of weldability, formability, and corrosion resistance required for structural frame applications. The hot-dip zinc coating protects against atmospheric corrosion in industrial environments, while the ±1% dimensional tolerance ensures connection plates and gussets fit without forced alignment. For EPC contractors sourcing from China, having both steel production and galvanizing under one roof eliminates the material certification gap that occurs when tubes are purchased from one supplier and galvanized at a separate facility.
Engineering Compliance and Certification for Galvanized Hollow Sections
Structural hollow sections used in load-bearing frames must comply with dimensional and material standards recognized by the project’s engineering authority. Galvanized SHS/RHS conforming to EN10219 or ASTM A500 provides documented chemical composition and mechanical properties for structural calculations. The hot-dip galvanizing process itself follows ISO 1461 or ASTM A123 standards, with coating thickness verified by magnetic gauge testing. For EU-bound shipments, CE marking under EN1090-2 requires the fabricator to hold Factory Production Control certification — a document that traces each batch from steel heat number through forming, welding, and galvanizing [NEED_CITE: EN 1090-2 structural steel fabrication certification requirements].
Understanding Steel Grade Selection for Galvanized Square and Rectangular Tubes
The choice between S235, S275, and Q235B depends on structural load requirements and regional specification preferences. S235 and S275 follow the European EN standard system, with S275 offering higher minimum yield strength for applications requiring greater load capacity. Q235B is the Chinese GB/T 700 equivalent, widely accepted in Southeast Asian and African markets where project specifications reference local standards. All three grades weld readily using conventional MIG/MAG or SAW processes, though the higher carbon equivalent of S275 may require preheating for thicker sections in cold weather conditions. The hot-dip galvanizing process does not alter the base steel’s mechanical properties — the zinc-iron alloy layers bond metallurgically to the surface without affecting the tube’s structural performance.
Hidden Costs of Unverified Galvanized Tube Procurement
Purchasing galvanized square and rectangular steel tubes without verified coating thickness or material certification creates risks that surface only at project handover. Thin zinc coatings fail prematurely in humid or saline environments, leading to rust bleed-through that compromises paint systems and triggers client rejection. Material certificates that cannot be traced to specific heat numbers raise red flags during third-party inspection, potentially delaying customs clearance or causing outright shipment refusal. The cost of re-galvanizing or replacing rejected tubes on-site far exceeds the price difference between verified mill supply and unverified trader stock [NEED_CITE: consequences of non-compliant galvanized coatings in structural applications].
Why Source Galvanized SHS/RHS from XJY Structure
Our vertically integrated operation produces both the raw steel and the finished galvanized tubes, meaning every batch carries full traceability from billet to bundle. The galvanizing line processes tubes immediately after fabrication, preventing rust formation on bare steel that would compromise zinc adhesion. We maintain 2,800+ specifications in stock, allowing mixed-size orders to ship in single containers without waiting for individual sizes to reach minimum rolling quantities. Each shipment includes mill test certificates showing chemical composition and mechanical properties, plus galvanizing coating thickness reports measured per bundle. For projects requiring third-party verification, we coordinate SGS or BV inspection at our facility before container loading.
Documentation & Compliance
- Mill test certificate documenting S235/S275/Q235B chemical composition and mechanical properties per EN10219 or ASTM A500
- Hot-dip galvanizing coating thickness report showing μm readings per ISO 1461 standard
- CE certificate for EN10219 cold-formed structural hollow sections (EU market compliance)
- ISO 9001 quality management system certificate covering steel production and fabrication
- Third-party inspection report from SGS/BV available upon request for material verification
- 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
- Plastic end caps on all tube ends to prevent internal corrosion and moisture accumulation
- Standard seaworthy packaging with waterproof wrapping for 6m and 12m lengths
- Mixed-size container loading optimized for 20ft and 40ft containers, maximizing weight utilization
- Heat number and steel grade marked on each bundle for site identification and traceability
- FOB/CIF/DDP shipping terms available with door-to-door logistics coordination
Initiating Your Galvanized SHS/RHS Inquiry
Share your project drawings or specification list including steel grade, section dimensions, wall thickness, total tonnage, and destination port. We respond within 24 hours with pricing, mill test certificate samples, and production lead time. For non-standard sizes or custom lengths, our engineering team reviews feasibility and provides shop drawing confirmation before production begins.
Frequently Asked Questions
Q: What is the difference between hot-dip galvanized and pre-galvanized square tubes?
A: Hot-dip galvanizing immerses finished tubes in molten zinc, coating all surfaces including weld seams and cut edges with 60–80μm thickness. Pre-galvanized tubes are made from already-coated strip, leaving weld zones and cut edges with minimal protection. Hot-dip is specified for outdoor and corrosive environments.
Q: Can you provide galvanized SHS/RHS in custom sizes not listed in standard catalogs?
A: Yes, we produce customized sizes with ±1% tolerance. MOQ for custom sizes is 1 Ton. Lead time depends on specification complexity and current production schedule.
Q: What material certification documents accompany each shipment?
A: Each shipment includes mill test certificates showing chemical composition and mechanical properties, galvanizing coating thickness reports, and dimensional inspection records. Third-party inspection from SGS or BV can be arranged before loading.
Q: How do you ensure coating quality consistency across large orders?
A: Our integrated facility controls the entire process from raw steel production through galvanizing. Coating thickness is measured on multiple points per bundle using magnetic gauges, with results documented in the shipment’s quality package.
Ready to Secure Your Galvanized SHS/RHS Supply?
Submit your specification list and quantity requirements to receive pricing with full material documentation. Contact us at admin@xjystructure.com or WhatsApp +86 188 5315 7756 for immediate technical review.
