Description
Factory-direct supply, no middlemen — Every galvanized square and rectangular steel tube ships with original mill test certificates and zinc coating reports, verified before loading.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | Q195, Q235, Q355, S235JR, S275JR, S355JR, S420NL, S460NL, S500Q, S550Q, S620Q, S690Q, ASTM A36, Grade 50, Grade 55, Grade 60, Grade 65, Grade 80, SS400, SS330, SPHC, SPFC, SPHD, SPHE |
| Standard | AISI, ASTM, DIN, JIS, GB, EN |
| Section Shape | Square / Rectangular |
| Size Range | 20 mm – 500 mm |
| Wall Thickness | 0.3 mm – 100 mm |
| Length | 5.8 m – 12 m |
| Technique | Hot Rolled / Cold Rolled / ERW |
| Surface Treatment | Hot Dip Galvanized (Zinc Coating 30 g – 275 g), PVC Coated, Black / Color Painting, Transparent Oil, Anti-rust Oil |
| Ends | With or without end caps |
| Application | Steel structures / Construction frames / Machinery / Scaffolding / Furniture / Greenhouse / Fencing |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Structural frames for commercial buildings, scaffolding systems, bridge support members |
| Machinery & Equipment | Machine base frames, conveyor support structures, industrial platform columns |
| Agricultural & Commercial | Greenhouse skeleton tubes, perimeter fencing posts, furniture frame sections |
Zinc Coating Consistency Decides Whether Your Shipment Passes Port Re-inspection
A 42-micron zinc reading against a 65-micron contract specification means the entire container is stuck at destination port.
Buyers ordering galvanized square and rectangular steel tubes for structural or outdoor applications frequently discover zinc coating shortfalls only after third-party re-inspection at destination. The cost of re-galvanizing an entire container far exceeds the original product value. Beyond zinc thickness, missing or unverifiable mill test certificates create customs clearance delays, while inconsistent wall thickness tolerances cause fabrication fit-up problems on site [NEED_CITE: hot dip galvanizing coating thickness standards for structural hollow sections].
Matching Structural Load Requirements Across Construction and Machinery Frames
When engineers specify galvanized SHS or RHS for building frames or machinery bases, the steel grade must deliver adequate yield strength while the zinc coating must survive fabrication welding and long-term exposure. Our galvanized square and rectangular steel tube range covers Q235 through Q355 for general structural work and S420NL through S690Q for high-load machinery frames, with hot dip galvanizing from 30 g/m² to 275 g/m² depending on the corrosion environment. Each tube ships with dimensional inspection reports and zinc thickness test data tied to the heat number, so site engineers can verify material identity without waiting for lab results.
Engineering Compliance and Certification for Global Project Delivery
Structural hollow sections used in load-bearing frames must comply with EN 10219 for cold-formed sections or EN 10210 for hot-finished sections in European-spec projects, while North American infrastructure typically requires ASTM A500 Grade 50 or Grade 55 certification. Galvanized tubes destined for marine or high-humidity environments need zinc coating verification against ISO 1461 or ASTM A123 thresholds. Third-party inspection by SGS or BV confirms chemical composition and mechanical properties before shipment, preventing customs holds caused by documentation gaps [NEED_CITE: EN 10219 cold-formed structural hollow section compliance requirements].
Steel Grade Selection and Galvanizing Process Fundamentals
The Q-series (Q195, Q235, Q355) follows Chinese GB standards where the number indicates minimum yield strength in MPa, while S-series grades (S235JR, S275JR, S355JR) follow European EN standards with similar yield designation but different impact testing requirements at sub-zero temperatures. ASTM A500 Grade 50, 55, 60, 65, and 80 represent incrementally higher yield strengths for North American structural applications. Hot dip galvanizing immerses the formed tube in molten zinc at approximately 450°C, creating a metallurgical bond that provides cathodic protection — the zinc sacrificially corrodes before the base steel does. Wall thickness tolerance directly affects both structural calculation accuracy and theoretical weight, since negative tolerance beyond standard limits reduces actual load capacity while the invoice still reflects nominal dimensions [NEED_CITE: steel grade equivalence between GB Q-series and EN S-series standards].
Hidden Costs of Procurement Errors in Galvanized Hollow Sections
Ordering galvanized square and rectangular steel tubes without verified mill test certificates risks material substitution — a Q235 tube delivered as Q195 passes visual inspection but fails structural load testing. Zinc coating below contract specification triggers re-galvanizing costs that exceed the original tube price, while wall thickness deviations beyond tolerance cause welding fit-up failures on site. Customs authorities in strict-import markets reject shipments lacking proper CE marking or ASTM compliance documentation, stranding cargo at port with daily demurrage charges accumulating [NEED_CITE: structural steel certification requirements for customs clearance in EU and Middle East markets].
Procurement Confidence Through Direct Factory Control
Every galvanized square and rectangular steel tube in our inventory comes from mills we audit directly, with chemical composition and mechanical property reports traceable to the original heat number. Our in-house laboratory tests zinc coating thickness using calibrated gauges before any shipment leaves the warehouse — the same method your third-party inspector will use at destination. We maintain stock across the full 20 mm to 500 mm size range and 0.3 mm to 100 mm wall thickness spectrum, eliminating the need to split orders across multiple suppliers. Custom cutting, welding preparation, punching, and bending services remove secondary fabrication delays at your site. Professional heavy-cargo loading experience ensures galvanized surfaces remain undamaged during container stuffing and ocean transit.
Documentation & Compliance
- Mill test certificate documenting Q235 or S355JR chemical composition and yield strength per EN 10219 or ASTM A500
- CE certificate confirming compliance with EN 10210 for hot-finished or EN 10219 for cold-formed structural hollow sections
- ISO 9001:2015 quality management certificate covering production and inspection processes
- SGS or BV third-party inspection report verifying zinc coating thickness and dimensional tolerance
- Material traceability report linking each tube to heat number, chemical composition, and mechanical test results
- Complete customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Galvanized tubes bundled with steel strips and edge protectors to preserve zinc coating integrity during ocean transit
- Surface protection maintained through proper bundling technique that prevents zinc scratching between adjacent tubes
- Container loading optimized for 5.8 m and 12 m lengths to maximize payload while respecting port weight restrictions
- Custom cut-to-length service available within the 5.8 m to 12 m range, with each piece marked by heat number and steel grade
- Heat number and steel grade stenciled on each bundle for site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with professional flatbed and open-top container loading experience
Request Quotation with Mill Test Certificate Preview
Submit your required steel grade, size dimensions, wall thickness, quantity, and destination port to receive a detailed quotation including material cost, processing fees, and shipping terms. We provide mill test certificate previews before contract signing so you can verify chemical composition and mechanical properties match your project specification. Custom cutting, punching, and bending requirements are quoted separately with processing lead times confirmed upfront.
Get Your Galvanized SHS/RHS Quote with Full Traceability
Send your specification sheet to receive pricing and mill test certificate samples within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjyplate.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjyplate.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
