Description
Vertically Integrated SHS/RHS Supply — Own steel mill and fabrication workshop deliver galvanized square and rectangular tubes with full material traceability from raw slab to finished section.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square / Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS/RHS) |
| Steel Grade | Q195, Q215, Q235, Q345, GR.A, GR.B, S235, S355 |
| Standard | ASTM A213, DIN EN 10217-1 |
| Section Shape | Square / Rectangular |
| Size Range | Customized outer diameter or side length |
| Wall Thickness | 0.8 – 30 mm |
| Length | 0.5 m – 11.8 m (500 / 1000 / 2000 / 4000 / 5800 / 11800 mm, customizable) |
| Technique | Welded (ERW) / Seamless options available |
| Surface Treatment | Pre-galvanized / Hot-dipped galvanized / Bare / Oiled / Black original steel |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Steel structures, construction frames, steel fence, steel post, warehouse construction, building construction |
| MOQ | 10 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Commercial & Industrial Construction | Warehouse portal frames, mezzanine beams, column bracing systems |
| Infrastructure & Civil Engineering | Highway guardrail posts, lighting pole bases, bridge access frameworks |
| Agricultural & Storage Facilities | Grain silo support rings, cold-storage structural frames, livestock shelter columns |
| Modular & Prefabricated Buildings | Container house corner posts, prefabricated wall girts, roof purlin systems |
What Negative Tolerance Actually Costs on a Galvanized Structural Frame
A ±1% wall-thickness deviation on a 1.2 mm galvanized SHS can drop the actual section modulus below the engineer’s calculation — and no amount of zinc saves a structurally undersized member.
On a Lagos warehouse project I inspected, a batch of 1.0 mm pre-galvanized rectangular tubes measured 0.88 mm at the flat zones. The supplier argued it was “within trade practice.” The structural engineer rejected the entire lot because the load-bearing capacity no longer matched the shop drawings. Rework meant re-ordering, re-shipping, and a three-week delay on site. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements] When you source a Galvanized Square and Rectangular Steel Tube Supplier who controls both rolling and galvanizing in-house, the tolerance chain stays closed — no third-party coil, no hidden negative tolerance.
Matching Section Geometry to Structural Load Paths
Galvanized SHS and RHS sections carry compression, bending, and torsion more efficiently than open profiles because the closed geometry distributes stress uniformly across all four faces. For warehouse portal frames and mezzanine beams, Q345 or S355 grades provide the higher yield strength needed at moment-resisting joints, while Q235 and S235 remain cost-effective for secondary bracing and purlin systems. The Galvanized Square and Rectangular Steel Tube Supplier you choose must offer both pre-galvanized and hot-dipped options — pre-galvanized suits indoor frames where formability matters, hot-dipped handles outdoor posts exposed to coastal or industrial atmospheres.
Engineering Compliance and Certification Requirements
Structural hollow sections used in load-bearing frames must conform to dimensional and mechanical standards recognized by the project’s governing code. European projects require EN 10210 (hot-finished) or EN 10219 (cold-formed) compliance with CE marking; North American specs typically call for ASTM A500 Grade B or C. [NEED_CITE: steel grade equivalence mapping between EN 10219 and ASTM A500] Galvanized coatings add another layer: hot-dipped zinc must meet minimum coating mass requirements (typically 275 g/m² or 60 μm per side) to guarantee the design corrosion protection life. A Galvanized Square and Rectangular Steel Tube Supplier issuing complete mill test certificates, coating thickness reports, and third-party inspection documents removes guesswork from the approval chain.
Steel Grade Selection and Manufacturing Process
The Q-series (Q195–Q345) follows the Chinese GB/T standard system, where the number indicates minimum yield strength in MPa; S235 and S355 follow the European EN system with equivalent mechanical tiers. For projects requiring ASTM compliance, GR.A and GR.B map to common structural grades. ERW welded tubes dominate the SHS/RHS market because the process delivers consistent wall thickness and sharp corner geometry at competitive cost — the longitudinal weld seam is positioned along the flat face, away from high-stress corner zones. Seamless options serve higher-pressure or critical-load applications where weld integrity cannot be tolerated. Surface treatment choice directly affects service life: pre-galvanized (zinc coated before forming) offers uniform coating but thinner edges; hot-dipped galvanized (coated after forming) provides thicker zinc at corners and weld zones, which is essential for outdoor structural posts. The ±1% tolerance on wall thickness means a specified 2.0 mm section can range from 1.98 to 2.02 mm — invoicing by theoretical weight based on nominal dimensions is standard practice, but buyers should verify actual measurements against purchase orders.
Hidden Costs of Sourcing the Wrong Specification
Ordering Q235 when the engineer specified S355 will pass visual inspection but fail structural load testing — the 50% yield strength gap means deflection exceeds allowable limits under design loads. Missing or forged mill test certificates trigger customs holds in the EU and Middle East, where CE marking and EN certification are mandatory for structural steel imports. [NEED_CITE: customs clearance requirements for structural steel hollow sections in EU markets] Coating thickness below specification — say 40 μm instead of the required 60 μm — accelerates corrosion at weld zones and connection points, leading to premature maintenance costs that far exceed the initial savings from accepting substandard goods.
Why Project Teams Source from XJY Structure
XJY Structure operates as the dedicated structural steel fabrication division of Shandong Xin Jiyuan Special Steel Tube Co., Ltd, combining raw steel production with downstream fabrication under one roof. This vertical integration means every galvanized SHS or RHS section traces back to our own mill heat — no third-party coil sourcing, no gaps in material certification. Our facility holds over 2,800 specification combinations in stock, covering the full range from 0.8 mm thin-wall pre-galvanized tubes to 30 mm heavy-wall hot-dipped sections. Certified welding procedures (WPS/PQR) and AWS/EN-qualified welders support any downstream fabrication — cutting, drilling, bending, or assembly — performed to approved shop drawings. Third-party inspection through SGS or BV is available before shipment, and every order ships with a complete documentation package: mill test certificates tied to heat numbers, coating thickness reports, dimensional inspection records, and export customs documents.
Documentation & Compliance
- Mill test certificate documenting Q345 or S355 chemical composition and mechanical properties per heat number, traceable to our own steel production facility
- CE certificate per EN 10210 / EN 10219 for structural hollow sections destined for European Union markets
- ISO 9001 quality management certificate covering the full production chain from raw material to galvanized finished product
- SGS or BV third-party inspection report verifying wall thickness, zinc coating mass, and dimensional tolerance before container loading
- Material traceability sheet linking each bundle’s heat number to the corresponding mill test certificate and coating inspection record
- Export customs documentation including packing list, bill of lading, and certificate of origin formatted for destination-country clearance
Packaging, Loading & Delivery
- Hot-dipped galvanized SHS/RHS bundles wrapped with waterproof cloth and edge protectors to prevent zinc coating damage from steel strap contact during ocean transit
- Pre-galvanized tubes stacked in steel-strip bundles with wooden cradles at 1.5 m intervals, optimized for 20ft and 40ft container loading based on 5.8 m and 11.8 m standard lengths
- Custom-cut sections (500 mm to 4000 mm) palletized and shrink-wrapped separately from full-length stock to prevent mixing on site
- Each bundle tagged with heat number, steel grade (e.g., S355), surface treatment type, and dimensional specification for immediate site identification
- FOB Jinan/Qingdao port or CIF/DDP delivery to project site, with professional lashing plans for oversized or heavy-wall sections exceeding standard container payload
Securing Your Quotation and Material Certification
Submit your project drawings (PDF or DWG), required steel grades, surface treatment preference, and destination port — our engineering team responds within 24 hours with a detailed quotation including material cost, fabrication charges, coating specification, and production schedule. For non-standard sizes or custom fabrication (cutting, drilling, welding), we provide shop drawing reviews and material optimization recommendations before contract signing.
Request Your Galvanized SHS/RHS Quotation Today
Send your specifications and required standards to receive pricing, mill test certificate samples, and delivery timelines.
Contact:
Mobile / WhatsApp / WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Website: www.xjystructure.com
