Description
Galvanized SHS & RHS Steel Tube Manufacturer — Direct mill supply covering 2,800+ specifications from raw steel to finished hollow sections.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Welded Square / Rectangular Steel Tube (SHS / RHS) |
| Product Type | Welded Hollow Section |
| Steel Grade | Q235, Q235B, Q195, Q355, S275, S275JR, A53, ST37, SGCC, CGCC, DX51D |
| Standard | ASTM, JIS, EN, GB |
| Section Shape | Square / Rectangular (SHS / RHS) |
| Size Range | 15×15 mm – 1500 mm |
| Wall Thickness | 1.2 – 20 mm |
| Length | 1 – 12 m (or as customer request) |
| Technique | Hot Rolled Based / Welded |
| Surface Treatment | Galvanized (Z30 – Z180) |
| Tolerance | ±1% |
| Spangle Type | Zero Spangle |
| MOQ | 15 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Steel frames, columns, trusses, platforms, stairways for buildings and industrial facilities |
| Logistics & Warehousing | Prefabricated warehouse and distribution center structural frames |
| Agriculture & Civil Works | Fencing structures, container frames, corrugated sheet framing |
| Industrial Manufacturing | Boiler pipe, small tool frames, conveyor support structures |
When Galvanized Coating Weight Decides Site Durability
Specifying Z30 for a coastal warehouse frame will cost you rework within two years.
Buyers often default to the cheapest galvanized coating weight on a quotation, only to discover that pre-galvanized tubes with thin zinc layers fail prematurely in humid or saline environments. The real cost emerges during site inspection — blistering, white rust, and coating peeling that force component replacement long before the structure reaches its design life. As a Galvanized Welded Square and Rectangular Steel Tube Supplier, we see projects across Southeast Asia and the Middle East where Z121–Z180 coating was required but Z30 was delivered, with no mill test certificate to prove otherwise. [NEED_CITE: hot-dip vs pre-galvanized coating performance in corrosive environments]
Matching Hollow Sections to Structural Frame Requirements
Galvanized welded SHS and RHS in Q235, Q355, and S275JR grades serve load-bearing frames where both compressive strength and corrosion resistance matter. The closed section geometry of square and rectangular hollow sections provides superior torsional rigidity compared to open profiles, making them suitable for column and beam applications in warehouse structures and industrial platforms. Our Galvanized Welded Square and Rectangular Steel Tube Supplier capability covers side lengths up to 1500 mm with wall thickness from 1.2 to 20 mm, allowing engineers to specify sections that match calculated load requirements without switching suppliers for different sizes.
Engineering Compliance and Certification for Global Delivery
Structural hollow sections shipped to European markets must conform to EN 10210 (hot-finished) or EN 10219 (cold-formed) standards, while North American projects typically reference ASTM A500 or A53. Galvanized coating weight and finish must be documented on the mill test certificate with heat number traceability back to the original steelmaking batch. [NEED_CITE: EN 10219 cold-formed hollow section requirements] Third-party inspection by SGS, BV, or TUV before shipment provides independent verification of coating thickness, dimensional tolerance, and mechanical properties — a requirement increasingly demanded by EPC firms managing multi-country procurement.
Steel Grade Selection and Welding Process Fundamentals
The Q-series (Q235, Q355) follows Chinese GB standards, S275JR belongs to the European EN system, and A53 represents the ASTM framework — all three are commonly specified for welded hollow sections in structural applications. The welded manufacturing process using high-frequency electric resistance welding produces a longitudinal seam that, when properly controlled, delivers consistent strength across the tube cross-section. Galvanized surface treatment with zero spangle finish and skin-pass rolling ensures uniform coating adhesion, which is critical when the tubes will receive additional powder coating or paint finishes on site. Wall thickness tolerance of ±1% means that a specified 5 mm wall will measure between 4.95 and 5.05 mm — tight enough for structural calculation accuracy while remaining practical for production. [NEED_CITE: steel grade equivalence between EN and ASTM standards]
Hidden Costs of Unverified Hollow Section Procurement
Ordering galvanized SHS/RHS without verified mill test certificates creates a cascade of risks: material that fails chemical composition checks at destination port, coating thickness below specification discovered only after cutting and welding, and dimensional deviations that prevent proper connection assembly. [NEED_CITE: structural steel quality documentation requirements for international projects] These issues do not surface during supplier selection — they emerge during customs clearance, third-party inspection, or worst case, after installation when structural engineers challenge the material paperwork.
Integrated Supply Chain from Raw Steel to Finished Tubes
XJY Structure operates as a Galvanized Welded Square and Rectangular Steel Tube Supplier with vertically integrated production — our own steel mill provides raw material for the fabrication workshop, eliminating the traceability gap between material source and finished product. With 2,800+ specifications in stock, projects requiring mixed sizes across Q235, Q355, and S275JR grades can be fulfilled from a single source with unified quality documentation. Certified welding procedures (WPS/PQR) and qualified welders support custom fabrication including CNC cutting, bending, punching, and welding per approved drawings. Professional loading plans for oversized and heavy tubes prevent the transit damage that has caused entire shipments to be rejected at destination ports.
Documentation & Compliance
- Mill test certificate documenting Q235B/Q355 chemical composition and mechanical properties per GB standards, with heat number traceability
- CE certificate confirming EN 10210/EN 10219 compliance for European market structural hollow sections
- ISO 9001 quality management system certificate covering the integrated steel production and fabrication process
- SGS or BV third-party inspection report verifying galvanized coating thickness (Z30–Z180), dimensional tolerance, and surface quality
- Material traceability documentation linking each bundle to its original heat number and steel grade
- Complete customs documentation including packing list, bill of lading, and certificate of origin for destination clearance
Packaging, Loading & Delivery
- Galvanized SHS/RHS bundled with steel strips and edge protectors to preserve the zero spangle zinc coating during ocean transit
- Seaworthy packaging with waterproof wrapping for tubes in 1–12 m lengths, optimized for 20ft and 40ft container loading
- Heat number and steel grade (Q235/S275JR/A53) stenciled on each bundle for site identification and inspection verification
- Custom cutting to project-specified lengths available, reducing on-site waste and welding joints
- FOB, CIF, and DDP shipping terms with professional lashing plans for oversized rectangular sections up to 1500 mm
- Door-to-door logistics coordination covering export documentation, container tracking, and destination port delivery
Requesting a Quotation with Full Technical Documentation
Submit your project drawings or specification list including steel grade, section dimensions, wall thickness, length, galvanized coating weight, and destination port. Our engineering team responds within 24 hours with a detailed quotation covering material, fabrication, coating, packing, and shipping costs, along with shop drawing timelines and mill test certificate samples.
Get Your Galvanized SHS & RHS Quote with Mill Test Certificates
Share your project specifications and required standards to receive a comprehensive quotation with full quality documentation.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
