Description
Factory-Direct Galvanized Hollow Sections — 2,800+ square and rectangular specifications shipped from our own production lines to 50+ countries, eliminating trading margins on every container.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Pipe |
| Product Type | Square / Rectangular Steel Tube (Galvanized) |
| Steel Grade | Q195, Q235, Q345, Q420, Q460, Q500, Q550, Q620, Q690 |
| Standard | EN 10219, EN 10210, ASTM A500, JIS G3466 |
| Section Shape | Square / Rectangular |
| Size Range | Square: 12×12–800×800 mm; Rectangular: 10×20–800×1000 mm |
| Wall Thickness | Up to 40 mm |
| Length | 1–12 m |
| Technique | Hot Rolled |
| Surface Treatment | Hot-Dip Galvanized (bare, oiled, black painted available) |
| Tolerance | Per EN 10219-2 / ASTM A500 |
| Ends | Plain / Beveled |
| Application | Outdoor construction, steel structures, prefab buildings, infrastructure |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors | Steel frames for industrial plants, modular plant structures, pipe rack supports |
| Construction Companies | Prefab house frames, carports, guard houses, garage sheds, villa structures |
| Commercial Developers | Shopping mall frameworks, school buildings, hospital extensions, sports venue roofs |
| Infrastructure Projects | Highway sound barriers, solar panel mounting structures, urban furniture frames |
| System Integrators | Conveyor support frames, automation line structures, warehouse racking uprights |
When Galvanized Coating Thickness Decides Whether a Container Clears Customs
A 35-micron coating on a 70-micron spec means the whole 20-foot load sits at the port.
I grew up around the steel mills in Liaocheng, where old hands taught me to read a weld seam by touch. Years later, I trusted a galvanizer’s word on coating thickness for a Southeast Asian contractor — 100×100×3mm galvanized square tubes. The client’s third-party inspector found only 35 microns, half the specification. That container never left the port. Now every galvanized pipe leaving our line goes through our own lab first: coating weight, adhesion, salt spray resistance — nothing ships until the numbers match the cert. [NEED_CITE: EN 10219 cold-formed hollow section requirements]
Fragmented sourcing makes this worse. Buyers ordering pipes, plates, and beams from separate suppliers face mismatched MTCs, inconsistent coating standards, and no single party accountable for the full documentation package. Customs officers in the EU and Middle East increasingly reject shipments lacking traceable heat numbers or proper CE marking under EN 10219.
Matching Structural Load Paths in Outdoor Construction Frames
Galvanized square and rectangular steel pipe in Q345 or Q460 grades carries the primary vertical and lateral loads in prefab structures, carports, and modular buildings where moisture and temperature cycling demand long-term corrosion protection. The hot-dip zinc layer bonds metallurgically to the hot-rolled substrate, providing barrier and sacrificial protection that outlasts paint systems in unsheltered environments. Our 2,800+ specification range means engineers can specify the exact section modulus needed for span calculations without switching suppliers mid-project.
Structural Code Compliance and Certification Pathways
Load-bearing frames for commercial and public buildings must demonstrate conformity with EN 1993 (Eurocode 3) in European markets or AISC 360 in North America, both of which reference EN 10219 for cold-formed welded hollow sections. [NEED_CITE: steel grade equivalence between EN and ASTM standards] The galvanized square and rectangular steel pipe we produce carries CE certification under EN 10210 and EN 10219, ISO 9001:2015 quality management, and Singapore FPC — covering the documentation chain from mill test certificate through customs clearance. Wall thickness tolerance per EN 10219-2 ensures that theoretical weight calculations match delivered material, preventing structural engineers from overestimating section capacity.
Steel Grade Selection and Hot-Dip Galvanizing Process
The Q-series grades (Q195 through Q690) follow the Chinese standard system where the number indicates minimum yield strength in MPa — Q345 delivers 345 MPa yield, suitable for most structural frames, while Q690 serves heavy-load industrial applications. Hot-rolled base tubes provide a uniform surface for galvanizing adhesion; the hot-dip process immerses formed tubes in molten zinc at approximately 450°C, creating a zinc-iron alloy layer bonded to the substrate. [NEED_CITE: hot-dip galvanizing coating thickness standards for structural steel] Surface finish options — galvanized, bare, oiled, or black painted — allow buyers to match the treatment to the installation environment: galvanized for unsheltered outdoor exposure, oiled for indoor storage before fabrication, black painted for aesthetic architectural applications.
The Hidden Cost of Unverified Coating and Tolerance
Ordering galvanized square and rectangular steel pipe without independent lab verification exposes projects to three failure modes: coating thickness below specification accelerates corrosion and fails inspector sign-off; wall thickness at the negative tolerance limit reduces actual load capacity below design assumptions; and missing or inconsistent MTCs trigger customs holds that delay project timelines by weeks. [NEED_CITE: structural steel certification requirements for EU construction products regulation] Engineering验收 rejects material that cannot demonstrate traceability from heat number through final inspection, turning a cost-saving purchase into a project-wide liability.
Why Project Procurement Teams Source Galvanized Hollow Sections From Us
Our factory operates three dedicated production lines with in-house physical and chemical laboratories — every batch of galvanized square and rectangular steel pipe undergoes coating weight measurement, adhesion testing, and salt spray evaluation before release. We hold 41 invention patents, including proprietary sharp-corner rectangular tube technology that eliminates the radius at corners for tighter structural connections and cleaner architectural appearance. The 2,800+ specification range covers square sections from 12×12 mm to 800×800 mm and rectangular sections up to 800×1000 mm, with wall thickness up to 40 mm — non-standard sizes available on request. CE certification under EN 10210 and EN 10219, ISO 9001:2015, and third-party verification through SGS and BV ensure that documentation matches the material in every container. Professional loading plans optimize container utilization for mixed-size orders, and door-to-door logistics cover FOB, CIF, and DDP terms to 50+ countries.
Documentation & Compliance
- Mill test certificate documenting Q195–Q690 chemical composition and mechanical properties per EN 10219, with heat number traceability from slab to finished tube
- CE certificate under EN 10210 and EN 10219 for structural hollow sections, required for construction product regulation compliance in EU member states
- ISO 9001:2015 quality management system certificate covering production, inspection, and traceability procedures
- SGS or BV third-party inspection report verifying coating thickness, dimensional tolerance, and surface quality for galvanized square and rectangular steel pipe
- Material traceability documentation linking each bundle to heat number, production date, and test results
- Customs-compliant document package including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- Galvanized square and rectangular steel pipe bundled with steel strips and edge protectors to preserve the zinc coating during ocean transit and handling
- Surface protection maintained through proper stacking separation and moisture barriers, preventing white rust formation on the galvanized layer
- Container loading optimized for mixed-size orders — 12 m lengths in 40ft open-top containers, shorter sections in standard 20ft units, maximizing payload per shipment
- Cut-to-length service available for 1–12 m requirements, with saw-cut ends deburred and protected against coating damage
- Heat number and steel grade stenciled on each bundle, with color-coding per grade for rapid site identification
- FOB, CIF, and DDP logistics options with real-time tracking, covering port-to-port and door-to-door delivery to project sites
Starting Your Procurement Process for Galvanized Hollow Sections
Submit your specification sheet — section dimensions, wall thickness, steel grade, quantity, and destination port — and receive a detailed quotation within 12 hours, including unit pricing, production timeline, and applicable certification documentation. Request non-standard size feasibility, mill test certificate samples from recent production runs, or loading plan optimization for mixed-container orders. Confirm CE marking requirements for EU destinations or ASTM A500 equivalence for North American projects before contract signing.
Frequently Asked Questions
Q: What steel grades are available for galvanized square and rectangular tubes?
A: We produce galvanized square and rectangular steel pipe in Q195 through Q690 grades per Chinese standards, with equivalent grades available per EN 10219 (S235, S275, S355 series) and ASTM A500 (Grades B, C, D). Steel grade selection depends on structural load requirements and destination market certification needs.
Q: Can you produce non-standard sizes and what is the minimum order quantity?
A: Our 2,800+ specification range covers standard square sections from 12×12 mm to 800×800 mm and rectangular sections from 10×20 mm to 800×1000 mm, with wall thickness up to 40 mm. Non-standard dimensions are available on request, with a minimum order quantity of 1 ton for custom sizes.
Q: How does hot-dip galvanizing compare to other surface treatments for outdoor corrosion resistance?
A: Hot-dip galvanizing creates a metallurgical bond between zinc and the steel substrate, providing both barrier protection and sacrificial cathodic protection. This outperforms paint systems in unsheltered outdoor environments, with coating thickness typically ranging from 45 to 85 microns depending on specification requirements.
Q: What certifications do you provide for EU and international customs clearance?
A: Our galvanized square and rectangular steel pipe carries CE certification under EN 10210 and EN 10219 for European markets, ISO 9001:2015 quality management certification, and Singapore FPC. Third-party inspection reports from SGS and BV are available for projects requiring independent verification.
Q: What is the production lead time and do you offer door-to-door logistics?
A: Standard production lead times apply for in-specification orders, with typical timelines confirmed at quotation stage. We offer FOB, CIF, and DDP shipping terms, with professional container loading optimization and real-time tracking for door-to-door delivery to project sites in 50+ countries.
Request Your Galvanized Hollow Section Quotation
Send your specification requirements — section size, wall thickness, steel grade, quantity, and destination — to receive pricing, mill test certificate samples, and delivery timeline within 12 hours.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjysteel.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
