Description
Factory-Direct Galvanized SHS/RHS Supply — Backed by our own steel mill with 2,800+ raw material specifications, we produce and galvanize square and rectangular tubes in-house, eliminating the traceability gap between material supplier and fabricator.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | Q195, Q235, Q355, ASTM A500 |
| Standard | ASTM A500, GB/T 6728, EN10219, EN10210, JIS G3466 |
| Section Shape | Square / Rectangular |
| Size Range | 20mm–500mm (side length) |
| Wall Thickness | 0.3mm–100mm |
| Length | 5.8m–12m (or cut-to-length) |
| Technique | Hot Rolled / Cold Rolled / ERW |
| Surface Treatment | Hot Dip Galvanized (30g–275g zinc coating), PVC Coating, Black/Color Painting, Oiled |
| Tolerance | Per EN10219 / ASTM A500 dimensional requirements |
| Ends | Plain (with or without end caps) |
| Application | Steel structures, construction frames, machinery, scaffolding, furniture, industrial facilities |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, warehouse columns, bridge support structures |
| Industrial Facilities | Factory roof trusses, equipment platforms, conveyor support frames |
| Scaffolding & Formwork | Scaffolding uprights, cross braces, formwork support systems |
| Machinery Manufacturing | Machine bases, hydraulic cylinder housings, structural frames for equipment |
| Commercial & Agricultural | Greenhouse frames, fencing posts, furniture structural components |
What Zinc Coating Weight Decides on a Galvanized Square and Rectangular Steel Tube Order
A 30g/m² coating protects indoor frames; 275g/m² survives coastal industrial atmospheres — specifying the wrong one means premature rust and rejected site inspection.
When procurement teams source galvanized tubes without verifying zinc coating weight against actual site conditions, the consequences surface months after installation. Coastal projects in the Middle East and Southeast Asia demand heavier zinc coatings, yet orders routinely arrive with light-gauge galvanizing meant for indoor use. The result: visible white rust within weeks, structural member replacement costs, and disputes over who bears the loss. Material traceability compounds this — when fabricators source raw tubes from third parties and galvanize separately, heat number chains break and third-party inspectors flag documentation gaps. [NEED_CITE: hot dip galvanizing coating thickness requirements per ASTM A123]
Matching Galvanized SHS/RHS to Structural Frame and Scaffolding Applications
Galvanized square and rectangular steel tubes in Q235 and Q355 grades carry compressive and bending loads in warehouse frames and scaffolding systems where both strength and corrosion resistance matter. The closed section geometry provides torsional rigidity that open profiles cannot match, while hot dip galvanizing at 65μm+ coating thickness protects welded connections and internal surfaces from moisture ingress. For scaffolding applications, the dimensional consistency of cold-formed ERW tubes ensures coupler fit and load transfer reliability across repeated assembly cycles.
Engineering Compliance and Certification Requirements for Galvanized Hollow Sections
Structural frames designed to EN 1993-1-1 or AISC 360 require hollow sections manufactured under controlled processes with documented mechanical properties. Galvanized Square and Rectangular Steel Tube produced to EN10219 cold-formed standards or ASTM A500 provides the certified material properties that structural engineers specify for load-bearing applications. European projects demand CE marking per EN10210/EN10219, while North American projects require ASTM A500 Grade B or C compliance with mill test certificates showing chemical composition and yield strength. Third-party inspection by SGS or BV verifies coating thickness and dimensional accuracy before shipment, preventing customs holds and site rejections. [NEED_CITE: EN 10219 cold-formed structural hollow section certification requirements]
Steel Grade Selection and Galvanizing Process Fundamentals
Q235 and Q355 represent the Chinese GB standard system where the number indicates minimum yield strength in MPa — Q355 delivers higher load capacity than Q235 for the same section size, allowing weight optimization in structural frames. ASTM A500 Grade B and Grade C follow the same logic with different yield thresholds. For galvanizing, hot dip processing at 450°C creates a metallurgical zinc-iron bond that outperforms electro-galvanized coatings in adhesion and corrosion protection. The 30g–275g coating weight range covers everything from indoor furniture frames to outdoor industrial structures in aggressive environments. Wall thickness tolerance directly affects theoretical weight calculations — tight tolerance per EN10219 ensures procurement teams receive the material quantity they paid for, while loose tolerance invites disputes over actual versus invoiced weight.
Hidden Costs of Specifying the Wrong Galvanized Tube
Ordering galvanized tubes without verified coating weight or material certification creates costs that surface during installation or inspection. Zinc coatings below specification fail salt spray tests, triggering full-batch rejection and re-galvanizing expenses at destination. Missing heat number traceability in mill test certificates blocks customs clearance in markets requiring EN or ASTM documentation. Wall thickness below nominal tolerance reduces load capacity, forcing structural engineers to order larger sections or reject the shipment entirely. These failures trace back to fragmented sourcing where tubes come from one supplier and galvanizing from another, breaking the quality chain. [NEED_CITE: material traceability requirements for structural steel in international projects]
Why Source Your Galvanized Square and Rectangular Steel Tube From an Integrated Mill
Our vertically integrated operation controls the entire production chain from steelmaking to galvanizing, meaning every Galvanized Square and Rectangular Steel Tube carries full heat number traceability back to our own melt shop. With 2,800+ raw material specifications in stock, we fulfill mixed-size orders without forcing buyers to source from multiple suppliers. Our in-house理化实验室 issues mill test certificates documenting chemical composition and mechanical properties per ASTM A500 or EN10219, eliminating third-party certification gaps. Certified welding procedures and qualified welders support downstream fabrication when buyers need shop drawings reviewed or connection details optimized. Professional loading teams plan container stuffing for 5.8m–12m lengths to maximize payload while protecting galvanized surfaces from transit damage.
Documentation & Compliance
- Mill test certificate documenting Q235/Q355 chemical composition and yield strength per GB/T 6728 or EN10219
- CE certificate confirming EN10210/EN10219 compliance for European structural applications
- ISO 9001 quality management certificate covering the full production process from steelmaking to galvanizing
- SGS or BV third-party inspection report verifying zinc coating thickness and dimensional tolerance before shipment
- Material traceability documentation linking each bundle to its original heat number from our steel mill
- Export customs documents including packing list, bill of lading, and certificate of origin for destination clearance
Packaging, Loading & Delivery
- Galvanized tubes bundled with steel strips and edge protectors to preserve zinc coating during ocean transit
- End caps installed on plain-ended tubes to prevent internal corrosion and debris accumulation during shipping
- Container loading optimized for 5.8m and 12m lengths to maximize payload while maintaining bundle integrity
- Heat number and steel grade markings stenciled on each bundle for site identification and traceability verification
- FOB, CIF, and DDP delivery terms available with professional logistics coordination to major construction ports
- Cut-to-length service available for orders requiring specific dimensions outside standard 5.8m–12m range
Request Your Galvanized Tube Quotation With Full Mill Documentation
Submit your project specifications including section size, wall thickness, steel grade, coating weight requirement, and destination port to receive a detailed quotation with production schedule and mill test certificate samples. Our engineering team reviews shop drawings and provides material optimization recommendations for structural frame and scaffolding applications. Confirm certification requirements and third-party inspection needs before production begins to ensure smooth customs clearance at destination.
Frequently Asked Questions
Q: What is the difference between Q235 and Q355 steel grades for galvanized square tubes?
A: Q355 offers higher minimum yield strength than Q235, allowing lighter section sizes for the same load capacity. Both grades galvanize equally well, with coating adhesion depending on surface preparation rather than steel grade.
Q: Can you provide mill test certificates for ASTM A500 compliance?
A: Yes, our in-house laboratory issues mill test certificates documenting chemical composition and mechanical properties per ASTM A500 Grade B or C requirements, with full heat number traceability from our steel mill.
Q: What zinc coating weight do you recommend for outdoor industrial structures?
A: For outdoor industrial environments, we recommend hot dip galvanizing at 275g/m² (approximately 65μm thickness) per ASTM A123 or EN ISO 1461 standards. Coastal or chemical exposure environments may require heavier coatings.
Q: Do you offer third-party inspection before shipment?
A: Yes, we coordinate SGS, BV, or TÜV inspections for coating thickness verification, dimensional checks, and visual quality assessment. Inspection reports are issued before container loading.
Q: What is the minimum order quantity for custom sizes?
A: Standard sizes from our 2,800+ specification inventory have no minimum order requirement. Custom non-standard dimensions or cut-to-length services require minimum quantities depending on section size and production setup.
Get Your Galvanized Square and Rectangular Steel Tube Quote Today
Send your specifications to admin@xjystructure.com or contact us via WhatsApp at +86 188 5315 7756 for pricing, mill test certificate samples, and production lead times.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
www.xjystructure.com
