Description
Factory-Direct Galvanized SHS/RHS — Every batch of A500 and S355JR galvanized square and rectangular steel tube ships with original mill test certificates and passes three-stage zinc coating inspection before leaving our Jinan facility.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | A53 Grade B, A500 Grade A/B/C, STK400, SS400, ST42.2, S355JR |
| Standard | ASTM A53, A500, A36, A795; BS1387; EN10255; ISO65; ANSI C80; DIN2440; JIS G3444; GB/T3091, GB/T13793 |
| Section Shape | Square, Rectangular |
| Size Range | 21.3 mm – 660 mm (1/2″ – 26″) |
| Wall Thickness | 6 mm (customizable) |
| Length | 5.8 m / 6 m / 11 m or as customer needs |
| Technique | Hot-dip Galvanized / Pre-Galvanized (ERW base pipe) |
| Surface Treatment | Hot-dip Galvanizing |
| Tolerance | ±1% |
| Ends | Plain ends, Beveled ends, Threaded ends, Grooved ends |
| Application | Municipal water & gas transmission, construction, structural frames, scaffolding, petrochemical, building industry |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Municipal Infrastructure | Water and gas transmission pipeline networks with threaded and grooved end connections |
| Construction & Structural | Building frames, column supports, and scaffolding systems using S355JR and A500 Grade C sections |
| Petrochemical & Industrial | Corrosion-resistant fluid transport lines and process pipe racks with hot-dip galvanized protection |
| Power & Energy | Solar farm mounting structures and substation framework assemblies |
Where Zinc Coating Thickness Decides Whether Your Shipment Clears Customs
A 38-micron reading against a 65-micron contract requirement will hold your entire container at the destination port.
I learned this the hard way when a 200×100 galvanized rectangular tube shipment to Saudi Arabia failed third-party reinspection at Jebel Ali — the zinc layer measured well below the specified minimum, and the client paid penalty fees for delayed project timelines. Since that incident, every galvanized square and rectangular steel tube leaving our facility passes through a coating thickness gauge three times before loading, with results documented in the inspection report. [NEED_CITE: hot-dip galvanizing coating thickness standards per ASTM A123 and ISO 1461]
Beyond coating inconsistency, buyers face specification gaps when standard catalogs cannot cover non-standard dimensions, fragmented sourcing when pipes and structural sections come from separate suppliers, and certification gaps that trigger customs holds in the EU and Middle East markets.
How Galvanized SHS and RHS Match Structural and Corrosion Demands
Hot-dip galvanized square and rectangular steel tube in S355JR and A500 Grade C grades delivers the load-bearing capacity structural engineers specify for building frames and scaffolding, while the zinc coating provides long-term corrosion protection for outdoor and industrial environments. The ERW base pipe is formed first, then fully immersed in molten zinc, ensuring coverage on all four faces and both internal and external corners — critical for hollow sections where untreated weld seams become corrosion entry points. Threaded and grooved end options allow direct installation in municipal pipeline networks without on-site welding, reducing field labor costs and maintaining coating integrity at connection points.
Engineering Compliance and Certification Requirements
Structural hollow sections used in load-bearing frames must conform to EN 10219 for cold-formed welded sections or EN 10210 for hot-finished sections in European markets, while ASTM A500 governs structural applications in North America. [NEED_CITE: EN 10219 cold-formed structural hollow section dimensional and tolerances requirements] The steel grade selection — whether S355JR for European projects or A500 Grade C for American specifications — determines the yield strength baseline and直接影响 structural design calculations. Hot-dip galvanizing provides superior corrosion resistance compared to pre-galvanized alternatives for projects in coastal or high-humidity environments, while pre-galvanized options suit indoor or short-service-life applications at lower cost. CE certification under EN 10210/10219 is mandatory for structural steel entering EU markets, and missing documentation causes customs delays that no amount of price negotiation can resolve. Custom lengths of 5.8 m, 6 m, or 11 m reduce on-site cutting waste and accelerate assembly timelines.
Steel Grade Selection and Galvanizing Process Fundamentals
The S355JR grade offers higher yield strength than S235 alternatives, making it the preferred choice for structural frames where load capacity drives section selection — though the actual weight per meter remains identical for the same dimensions regardless of grade. ASTM A500 Grade B and Grade C provide equivalent structural performance in the American specification system, with Grade C offering tighter chemical composition controls for critical applications. [NEED_CITE: steel grade equivalence between EN 10219 S355JR and ASTM A500 Grade C] Hot-dip galvanizing produces a zinc-iron alloy layer metallurgically bonded to the steel substrate, delivering coating thickness typically exceeding 65 microns for long-term outdoor exposure, while pre-galvanized tubes use electro-galvanized or sendzimir-coated strip before forming, resulting in thinner zinc layers suitable for protected environments. The ±1% dimensional tolerance applies to outer dimensions and wall thickness, ensuring fit-up compatibility with standard connection hardware and bracket systems. Wall thickness directly affects both structural capacity and galvanized coating adhesion — thicker walls retain heat longer during the galvanizing bath, promoting more uniform alloy layer formation.
Hidden Costs of Procuring Galvanized Tubes Without Verified Specifications
Ordering galvanized square and rectangular steel tube based on price alone invites three categories of hidden cost: coating thickness below specification triggers rejection at destination port inspection, requiring either return shipment or costly on-site recoating; missing CE or mill test certificates cause customs holds that delay project timelines and incur storage fees; and wall thickness at the negative tolerance limit reduces actual load capacity below engineering design assumptions, creating structural safety concerns during inspection. [NEED_CITE: consequences of non-conforming galvanized coating in structural applications] Material substitution — receiving Q235B when S355JR was specified — may pass visual inspection but fails mechanical testing, forcing complete replacement of installed sections.
Why Buyers Source Galvanized SHS/RHS from Our Facility
We operate three production lines running simultaneously with monthly capacity exceeding 20,000 tons, producing hot-dip and pre-galvanized square and rectangular steel tube in over 2,800 specifications maintained as ready stock for urgent dispatch. Factory-direct pricing eliminates trader margins, with volume discount programs reviewed every six months for long-term partners. Every batch ships with original mill test certificates documenting chemical composition and mechanical properties per EN 10219 or ASTM A500, and SGS or BV third-party inspection is available on request for buyers requiring independent verification. Our in-house laboratory conducts three-stage inspection covering dimensional accuracy, coating thickness, and surface quality before any shipment leaves Jinan. We consolidate multi-product orders — combining galvanized tubes, plates, and structural sections — into single container loads, optimizing freight cost per ton for project buyers sourcing multiple categories. Custom lengths, end processing, and non-standard dimensions are available with typical production lead times, supported by professional export documentation handling and container loading optimization.
Documentation & Compliance
- Mill test certificate documenting S355JR or A500 Grade C chemical composition and mechanical properties per EN 10219 or ASTM A500, issued with heat number traceability
- CE certificate confirming compliance with EN 10210 (hot-finished) or EN 10219 (cold-formed) for structural hollow sections entering European markets
- ISO 9001:2015 quality management certificate covering production processes and inspection procedures
- SGS or BV third-party inspection report verifying coating thickness, dimensional accuracy, and surface quality upon request
- Material traceability documentation linking each tube to its heat number and production batch for project quality audits
- Complete customs documentation package including packing list, bill of lading, and certificate of origin for destination port clearance
Packaging, Loading & Delivery
- Galvanized tubes bundled with steel strips and edge protectors to preserve the zinc coating during ocean transit and prevent mechanical damage at contact points
- Surface protection maintained through proper stacking separation and moisture barriers, preventing white rust formation on hot-dip galvanized surfaces during container shipping
- Container loading optimized for mixed-size orders combining 21.3 mm small-bore tubes with 660 mm large sections, maximizing payload per TEU and reducing freight cost per ton
- Custom cutting to 5.8 m, 6 m, or 11 m lengths available before shipment, eliminating on-site cutting waste and accelerating project assembly
- Heat number and steel grade markings applied to each tube end for site identification and material traceability during installation
- FOB, CIF, and DDP shipping terms available with professional export documentation handling and real-time tracking from Jinan facility to destination port
Getting Your Galvanized Tube Inquiry Quoted
Submit your specifications including section dimensions, wall thickness, steel grade (S355JR, A500 Grade C, or equivalent), total quantity, and destination port to receive a competitive bulk quotation within 12 hours. We provide mill test certificates, coating thickness reports, and CE documentation with every shipment, and our team will confirm custom length requirements, end processing needs, and container loading optimization before production begins.
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 on WhatsApp at +86 188 5315 7756 to receive bulk pricing, coating thickness guarantees, and complete export documentation for your next project.
Frequently Asked Questions
Q: What is the difference between hot-dip galvanized and pre-galvanized square and rectangular steel tube?
A: Hot-dip galvanizing immerses the finished tube in molten zinc, producing a metallurgically bonded coating typically exceeding 65 microns thick, suitable for outdoor and corrosive environments. Pre-galvanized tubes are manufactured from electro-galvanized or sendzimir-coated strip before forming, resulting in thinner zinc layers appropriate for indoor or protected applications at lower cost.
Q: Can you supply non-standard dimensions and what is the minimum order quantity for custom galvanized tubes?
A: We produce custom galvanized square and rectangular steel tube in non-standard dimensions beyond our 2,800+ ready-stock specifications, with a minimum order quantity of 1 ton for custom orders and typical production lead times for non-standard sizes.
Q: What certificates are required for customs clearance in the EU, Middle East, and Southeast Asia?
A: European markets require CE certification under EN 10210 or EN 10219 for structural hollow sections, while Middle Eastern and Southeast Asian buyers typically need mill test certificates with chemical composition and mechanical properties, plus certificate of origin documentation. We provide complete export documentation packages for all destination markets.
Q: How do you optimize container loading for mixed-size galvanized tube orders?
A: Our export team consolidates small-bore tubes (21.3 mm to 114 mm) with larger sections (up to 660 mm) in single containers, using nested loading patterns and proper separation to maximize payload per TEU and reduce freight cost per ton for multi-specification project orders.
Q: Do you provide third-party inspection reports for galvanized coating thickness verification?
A: Yes, SGS and BV third-party inspection is available on request for every shipment, verifying coating thickness, dimensional accuracy, and surface quality before container loading, with reports provided alongside original mill test certificates.
