Description
Factory-Direct Bulk Supply — 2,800+ specifications in Q195–Q345 and ASTM A500 grades ready for immediate dispatch from Jinan production lines.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square and Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | Q195, Q235, Q345, SGCC, CGCC, TDC51D+ZM, TDC52D+TS350GD, TS550GD, DX51D+Z, A53 Grade B, A500 Grade A/B/C, STK400, SS400, ST42.2, S355JR |
| Standard | ASTM A53, A500, A36, A795; BS1387; EN10255; ISO65; ANSI C80; DIN2440; JIS G3444; GB/T3091, GB/T13793; AS1163; JIS G3466; EN10219; EN10210 |
| Section Shape | Square / Rectangular / Round |
| Size Range | Outer Diameter 21.3mm–660mm (1/2″–26″) |
| Wall Thickness | 1.5–33mm |
| Length | 5.8m / 6m / 11.8m / 12m or as required |
| Technique | Hot Rolled / Cold Rolled / ERW |
| Surface Treatment | Hot Dip Galvanized / Pre-Galvanized (Coated) |
| Tolerance | ±1% |
| Ends | Plain / Beveled / Threaded / Grooved |
| Application | Construction structures, scaffolding, building frames, fencing, greenhouse structures, fluid transportation, hydraulic systems, precision machinery, power plants, boiler systems, petrochemical industry |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, scaffolding systems, structural supports, fencing posts |
| Industrial & Mechanical | Hydraulic system piping, precision machinery frames, conveyor structures |
| Energy & Utilities | Oil/gas/water fluid transportation lines, power plant support structures, boiler system frameworks |
| Agriculture | Greenhouse structural frames, irrigation support posts |
Where Missing Mill Certificates Stall Customs Clearance on Galvanized SHS/RHS
Original mill test certificates per heat number are non-negotiable for EU and Middle East port acceptance.
Procurement teams ordering hot dip galvanized square and rectangular steel tubes from fragmented suppliers frequently discover that certificates are either missing entirely or reference a different heat batch than the material shipped. Without traceable MTCs documenting chemical composition and mechanical properties per EN10219 or ASTM A500, customs authorities in Dubai, Riyadh, and Lagos hold containers pending verification — turning a routine delivery into weeks of demurrage costs. [NEED_CITE: import documentation requirements for structural steel in GCC countries]
Matching Galvanized SHS/RHS to Structural Load and Corrosion Environments
Hot dip galvanized square and rectangular steel tubes in Q235 and Q345 grades serve load-bearing frames where both structural integrity and atmospheric corrosion resistance matter. The zinc coating thickness from hot dip galvanizing provides decades of protection in outdoor scaffolding, fencing, and greenhouse structures without additional painting. For projects specifying ASTM A500 Grade B or C, the combination of higher yield strength and full zinc coverage handles both wind-load calculations and coastal humidity exposure. Our Jinan facility stocks standard sizes across 2,800+ specifications, meaning structural engineers can finalize designs without waiting for custom rolling schedules.
Engineering Compliance Across EN, ASTM, and JIS Frameworks
Galvanized SHS/RHS produced to EN10219 and EN10210 meets European structural hollow section requirements for CE-marked projects, while ASTM A500 Grade A/B/C satisfies North American building code specifications. [NEED_CITE: EN 10219 cold-formed structural hollow section dimensional tolerances] Steel grade equivalence between Q235/Q345 and S355JR or A500 Grade B allows procurement teams to source from a single supplier for multi-region projects. Wall thickness tolerance of ±1% ensures that theoretical weight calculations match actual delivered weight — critical for structural engineering sign-off. Third-party SGS or BV inspection verifies coating thickness uniformity and dimensional compliance before container sealing. [NEED_CITE: hot dip galvanized coating thickness standards for structural steel]
Steel Grade Selection and Galvanizing Process Fundamentals
Q195 and Q235 represent the most commonly specified grades for general structural applications where formability and weldability take priority over ultimate strength. Q345 and S355JR provide higher yield strength for load-bearing columns and beam-to-column connections in multi-story frames. ERW manufacturing produces the longitudinal weld seam that, after full annealing and galvanizing, becomes virtually indistinguishable from the base metal in corrosion performance. Hot dip galvanizing immerses the formed tube in molten zinc at approximately 450°C, creating a metallurgical bond with the steel substrate that pre-galvanizing (electro-galvanizing) cannot replicate — the difference matters for structures exposed to industrial atmospheres or coastal salt spray. Wall thickness from 1.5mm to 33mm covers everything from light-duty fencing posts to heavy structural columns, with the ±1% tolerance maintaining dimensional consistency across production batches.
Hidden Costs of Unverified Galvanized Tube Procurement
Purchasing galvanized SHS/RHS without original mill test certificates risks material substitution — a Q195 tube stamped as Q345 passes visual inspection but fails structural load testing on site. Coating thickness below specification accelerates corrosion in humid environments, forcing premature replacement that costs multiples of the original material savings. Missing CE certification blocks EU project acceptance entirely, regardless of actual material quality. [NEED_CITE: consequences of non-compliant structural steel in construction projects] Negative tolerance abuse — where actual wall thickness falls below the specified minimum — reduces load capacity while invoicing by theoretical weight overcharges the buyer.
Why Bulk Buyers Source Galvanized SHS/RHS from Jinan
Factory-direct pricing eliminates trading company margins on every ton shipped. Three simultaneous production lines deliver monthly capacity exceeding 20,000 tons, supporting both urgent project timelines and scheduled bulk procurement. Every batch ships with original mill test certificates traceable by heat number, with SGS or BV third-party inspection available for buyers requiring independent verification. ISO 9001:2015, CE (EN10210/EN10219), and FPC certifications satisfy compliance requirements across European, Middle Eastern, and African markets. Flexible MOQ from 1 ton accommodates trial orders while volume discount programs reward long-term supply partnerships. Professional export teams optimize container loading plans — critical for galvanized tubes where improper stacking damages zinc coating during ocean transit.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and yield strength per GB/T3091 or EN10219 for each heat number
- CE certificate (EN10210/EN10219) enabling customs clearance for EU structural steel imports
- ISO 9001:2015 quality management system certificate covering production and inspection processes
- SGS or BV third-party inspection report verifying galvanized coating thickness and dimensional tolerance
- Material traceability documentation linking each tube bundle to original heat number and production batch
- Complete customs document package 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
- Seaworthy packaging with waterproof wrapping for hot dip galvanized surfaces, preventing white rust formation in humid container environments
- Container loading optimization for 5.8m and 6m lengths, maximizing payload while preventing tube-to-tube abrasion that damages galvanized coating
- Custom length cutting available for 11.8m and 12m requirements, with bundled labeling showing heat number and steel grade
- FOB/CIF/DDP shipping terms with professional documentation handling for Jebel Ali, Lagos, and South American ports
Request Your Galvanized SHS/RHS Quotation with Full Documentation
Submit specifications including section dimensions, wall thickness, steel grade, quantity, and destination port to receive factory-direct pricing with mill test certificates included. Non-standard sizes and custom galvanizing requirements receive technical review within 12 hours.
Get Factory-Direct Pricing with Mill Test Certificates
Send your galvanized square and rectangular steel tube specifications to admin@sdxinjiyuan.com or WhatsApp +86 188 5315 7756 for bulk quotation with full compliance documentation.
