Description
Factory-Direct Electro-Galvanized SHS/RHS — Zinc coating verified to 600 g/m² with original mill test certificates on every bundle, shipped from Jinan to your port without trading margins.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | Q195, Q235, Q345, SS400 |
| Standard | ASTM A53, A500, A36, A795; BS 1387; EN 10255; ISO 65; ANSI C80; DIN 2440; JIS G3444; GB/T 3091, GB/T 13793 |
| Section Shape | Square, Rectangular |
| Size Range | 21.3 mm – 660 mm (1/2″ – 26″) |
| Wall Thickness | 0.12 – 5 mm |
| Length | 5.8 m / 6 m / 11 m or customized |
| Technique | Hot Rolled Based / ERW |
| Surface Treatment | Electro-Galvanized (Zinc Coated 40 – 600 g/m²), Zero Spangle |
| Tolerance | ±1% |
| Ends | Plain ends, Beveled ends, Threaded ends, Grooved ends |
| Application | Steel structures, Construction frames, Machinery, Scaffolding, Furniture, Fencing, Fluid transport, Power, Boiler, Petrochemical |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | High-rise building frames, bridge handrails, solar mounting structures |
| Machinery & Equipment | Scaffolding systems, conveyor frames, agricultural machinery chassis |
| Furniture & Interior | Display racks, shelving supports, decorative fencing panels |
| Industrial Piping | Low-pressure fluid transport lines, boiler feed water piping, petrochemical support structures |
What Zinc Coating Uniformity Costs You on a Galvanized Square and Rectangular Steel Tube Order
Electro-galvanized coating must be measured by micrometer, not by eye.
Early in my career I loaded a container of electro-galvanized tubes bound for a Brazilian medical equipment buyer. The zinc surface looked bright and uniform under warehouse lights. Their SGS inspector at Santos port pulled a coating thickness gauge, found readings below 8 microns against a 12-micron spec, and the entire shipment was held. Re-inspection fees consumed the margin and we nearly lost the account. Since then every galvanized tube we ship gets coating weight verified before sealing — and as a Galvanized Square and Rectangular Steel Tube Supplier, we now run that check on every bundle leaving Jinan. Buyers sourcing galvanized SHS/RHS across multiple vendors frequently discover that “galvanized” on a proforma invoice can mean anything from a decorative flash coat to a proper corrosion barrier, with no mill test certificate to prove which one arrived [NEED_CITE: electro-galvanized coating thickness standards for structural hollow sections].
Matching Galvanized SHS/RHS to Structural and Corrosion Environments
Electro-galvanized square and rectangular steel tubes in Q195 through Q345 grades serve projects where surface appearance matters as much as corrosion resistance — interior structural frames, display structures, and light-gauge scaffolding where zero-spangle finish avoids repainting. The 40–600 g/m² zinc range lets engineers specify coating weight to match indoor, sheltered outdoor, or mildly corrosive industrial atmospheres without paying for hot-dip thickness they do not need. As a Galvanized Square and Rectangular Steel Tube Supplier, we match coating class to the project environment during inquiry review rather than defaulting every order to the same specification.
Engineering Compliance and Certification Requirements
Structural frames carrying EN 1993 design loads require hollow sections that conform to EN 10219 cold-formed dimensions or EN 10210 hot-formed tolerances, with chemical composition and yield strength traceable to heat number [NEED_CITE: EN 10219 cold-formed structural hollow section dimensional tolerances]. For Middle East and Southeast Asian customs, mill test certificates must accompany every bundle; CE marking under the Construction Products Regulation is mandatory for EU entry. Our Q235 and Q345 tubes ship with full MTC documentation, and we arrange SGS or BV third-party inspection at the mill before container sealing. Wall thickness tolerance of ±1% ensures that theoretical weight calculations used in structural design match actual delivered weight — a point that matters when negative-tolerance material arrives and load-bearing capacity falls short of engineering assumptions.
Steel Grade Selection and Electro-Galvanizing Process
Q195, Q235, and Q345 represent the Chinese GB/T grade series where the number indicates minimum yield strength in MPa; SS400 is the Japanese JIS equivalent tensile-grade designation. For projects specifying European or American standards, Q235 maps broadly to S235JR under EN 10025 and ASTM A36 under the US system, though exact equivalence depends on chemical composition and impact testing requirements [NEED_CITE: steel grade equivalence mapping between GB, EN, and ASTM standards for structural sections]. Electro-galvanizing deposits zinc electrolytically rather than dipping in a molten bath, producing a smoother, more uniform coating with zero spangle — ideal for visible architectural applications where hot-dip’s characteristic crystalline pattern is undesirable. The skin-pass process applied after galvanizing improves flatness on rectangular sections and ensures dimensional accuracy within ±1% tolerance, critical when tubes must slot into prefabricated connection nodes on site.
Hidden Costs of Specifying the Wrong Galvanized Hollow Section
Ordering electro-galvanized SHS/RHS without verifying coating weight against the project’s corrosion category leads to premature rust-through in sheltered outdoor applications — replacement costs dwarf the initial coating upgrade. Material supplied without original mill test certificates faces customs holds in markets requiring CE or SASO documentation, generating demurrage charges and project delays [NEED_CITE: customs documentation requirements for galvanized steel imports in Middle East markets]. Negative-tolerance wall thickness that passes visual inspection but fails ultrasonic measurement reduces structural capacity below design assumptions, triggering re-engineering costs that no supplier warranty covers.
Why Source Galvanized Square and Rectangular Steel Tube from XJY Plate
We operate as a dedicated plate and coil division under Shandong Xin Jiyuan Special Steel Tube Co., Ltd, meaning galvanized SHS/RHS orders go directly to mill stock without trading-company markups. Every tube ships with an original mill test certificate showing heat number, chemical composition, and mechanical properties — not a re-issued document from a third party. Our Jinan warehouse holds common sizes in Q195 through Q345 and SS400, with custom cutting to length and end processing available for orders above MOQ. ISO 9001:2015 and CE certification support EU and international customs clearance, while SGS and BV third-party inspection can be arranged before container sealing. Professional heavy-cargo loading experience ensures galvanized coatings are protected with edge protectors and proper container weight distribution during ocean transit.
Documentation & Compliance
- Mill Test Certificate documenting Q195/Q235/Q345/SS400 chemical composition and mechanical properties per GB/T 3091 or ASTM A500, traceable to heat number
- CE certificate confirming compliance with EN 10219 cold-formed structural hollow section requirements for EU market entry
- ISO 9001:2015 quality management system certificate covering galvanizing process and dimensional inspection
- SGS or BV third-party inspection report verifying zinc coating thickness and dimensional tolerance before shipment
- Material traceability sheet linking each bundle to heat number, coating weight class, and production date
- Full customs documentation package including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- Electro-galvanized tubes bundled with steel straps and edge protectors to prevent zinc coating abrasion during ocean transit
- Zero-spangle surface preserved by interleaving paper or plastic caps on tube ends for sizes below 100 mm side length
- Container loading optimized for 5.8 m and 6 m lengths in 20-foot units, with 11 m lengths shipped in 40-foot open-top or flat-rack containers
- Custom cut-to-length service available for project-specific dimensions, with kerf loss calculated and quoted transparently
- Each bundle labeled with heat number, steel grade, size, and coating weight class for site identification and traceability
- FOB, CIF, and DDP terms available with professional flatbed and break-bulk logistics for heavy-tonnage orders
Starting Your Galvanized SHS/RHS Procurement
Submit your specification sheet including steel grade, side dimensions, wall thickness, length, coating weight requirement, and destination port — we respond within 12 hours with pricing, mill test certificate samples, and estimated production lead time. For non-standard sizes or end-processing requirements, our technical team provides cut-to-size proposals with dimensional drawings before order confirmation.
Request a Quote with Mill Test Certificate
Send your Galvanized Square and Rectangular Steel Tube specifications to admin@xjyplate.com or contact us via WhatsApp at +86 188 5315 7756 for pricing, MTC samples, and shipping arrangements.
Frequently Asked Questions
Q: What is the difference between electro-galvanized and hot-dip galvanized square and rectangular steel tubes?
A: Electro-galvanizing deposits zinc electrolytically, producing a smoother zero-spangle finish with coating weights from 40 to 600 g/m², suitable for indoor and architectural applications. Hot-dip galvanizing creates a thicker metallurgical bond with characteristic spangle pattern, better for heavy outdoor corrosion environments. The choice depends on your project’s corrosion category and surface appearance requirements.
Q: Can you supply Q235 tubes with certification for EU customs clearance?
A: Yes. We provide CE certification confirming compliance with EN 10219 for cold-formed structural hollow sections, along with mill test certificates showing chemical composition and mechanical properties. SGS or BV third-party inspection can be arranged before shipment to support customs documentation requirements.
Q: What is the minimum order quantity for custom-cut galvanized rectangular tubes?
A: Our MOQ is 1 Ton. We offer custom cutting to length, end processing including plain, beveled, threaded, or grooved ends, and can produce non-standard side dimensions within our 21.3 mm to 660 mm range for orders meeting the minimum weight requirement.
Q: How do you ensure zinc coating uniformity on rectangular sections?
A: Every bundle undergoes coating thickness verification using magnetic induction gauges at multiple points before packing. Original mill test certificates document the coating weight class, and we maintain ±1% dimensional tolerance through skin-pass processing after galvanizing to ensure flatness on rectangular faces.
Q: Which steel grade should I specify for a structural frame project in Southeast Asia?
A: Q235 is the most commonly specified grade for general structural frames in Southeast Asian markets, offering good weldability and formability. For higher load-bearing requirements, Q345 provides increased yield strength. We can supply grade equivalence documentation mapping Q235/Q345 to ASTM A36/A572 or EN S235/S355 if your project specification references international standards.
