Description
Factory-Direct Pricing, No Middlemen — A500 and ASTM A53 galvanized square steel pipes produced on our own 3 dedicated lines, shipped to 50+ countries with full mill test certificates.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square Steel Pipe |
| Product Type | Square Steel Tube (Hot-Dip Galvanized) |
| Steel Grade | A53 Grade B / A500 Grade A / Grade B / Grade C / STK400 / SS400 / ST42.2 / S355JR |
| Standard | ASTM A53 / A500 / A36 / A795; BS 1387; EN 10255; ISO 65; ANSI C80; DIN 2440; JIS G3444; GB/T 3091 / GB/T 13793 |
| Section Shape | Square |
| Size Range (Side Length) | 21.3 mm – 660 mm (1/2″ – 26″) |
| Wall Thickness | 6 mm – 10 mm |
| Length | 5.8 m / 6 m / 11 m / 12 m / 6.4 m (customizable) |
| Technique | ERW Welded + Hot-Dip Galvanizing |
| Surface Treatment | Hot-Dip Galvanizing |
| Ends | Plain / Beveled / Threaded / Grooved |
| Processing Service | Punching / Cutting / Bending |
| Package | Standard Seaworthy Packing (plastic caps + woven bag + steel strip bundle) |
| Application | Municipal water & gas transmission / Fluid transport / Construction / Structural frames / Machinery parts / Power / Petrochemical / Boiler |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors (Municipal Infrastructure) | Underground water mains, gas distribution networks, fire protection risers |
| Construction Companies | Structural frames for warehouses, scaffolding uprights, mezzanine supports |
| Machinery Manufacturers | Conveyor system uprights, equipment bases, hydraulic cylinder sleeves |
| System Integrators | Automation line frames, solar mounting structures, cable tray supports |
Zinc Coating Thickness Is Where Municipal Pipe Orders Fail Inspection
Hot-dip galvanizing must meet minimum coating mass — not just visual coverage.
On a municipal water transmission project in the Middle East, a batch of galvanized square pipes arrived at port with coating thickness below the 600 g/m² threshold required by ASTM A123. The third-party inspector rejected the entire container. The root cause: the supplier had relied on pre-galvanized strip rather than true hot-dip galvanizing after forming. For buyers sourcing a Galvanized Square Steel Pipe for water and gas networks, this distinction is the difference between a 20-year service life and premature rust-through at welded joints. Coating uniformity on internal corners of square sections is especially vulnerable when the galvanizing bath temperature or immersion time is not tightly controlled [NEED_CITE: ASTM A123 minimum coating mass requirements for hot-dip galvanized steel].
Matching Municipal and Structural Demands with Full-Range Specifications
A Galvanized Square Steel Pipe in 10 mm wall thickness and 660 mm side length serves heavy-load structural frames where standard catalog sizes fall short. Our 3 production lines cover 2,800+ specifications, meaning EPC contractors can source both small-bore 21.3 mm tubes for instrumentation lines and large-section 660 mm pipes for main structural columns — from a single purchase order. Threaded and grooved ends allow direct field connection without additional welding, reducing on-site labor costs for gas transmission networks.
Engineering Compliance Across ASTM, EN, and JIS Frameworks
Galvanized Square Steel Pipe orders for EU infrastructure must carry CE marking under EN 10210 (hot-finished) or EN 10219 (cold-formed), while North American municipal projects typically specify ASTM A500 Grade B or Grade C. The steel grade S355JR conforms to EN 10025 and is widely accepted across European and Middle Eastern specifications, whereas A53 Grade B remains the default for US water and gas pipelines [NEED_CITE: steel grade equivalence between ASTM A500 and EN 10210]. Our in-house physical and chemical laboratory tests every heat for yield strength, tensile strength, elongation, and coating mass — results are documented in the Mill Test Certificate with full traceability by heat number. Singapore FPC certification further supports compliance for Southeast Asian government tenders.
Steel Grade Selection and Hot-Dip Galvanizing Process
The steel grades offered — A500 Grade A through Grade C, A53 Grade B, S355JR, SS400 — represent increasing yield strength levels. A500 Grade A suits light structural framing, while Grade C and S355JR are specified for load-bearing columns and bridge components where higher yield strength reduces section size and weight. ERW welding followed by hot-dip galvanizing ensures the zinc coating covers both the outer surface and the weld seam, providing uniform corrosion protection. The hot-dip process immerses the formed square tube in molten zinc at approximately 450°C, creating a metallurgical bond that outperforms electro-galvanized or painted alternatives in buried or submerged conditions. Wall thickness tolerance directly affects theoretical weight calculations — a 10 mm nominal wall delivered at -0.5 mm under tolerance reduces load capacity and may fail structural engineer approval [NEED_CITE: impact of negative wall thickness tolerance on structural hollow section performance].
The Hidden Cost of Unverified Coating and Missing Certificates
Purchasing a Galvanized Square Steel Pipe without verified coating mass or valid Mill Test Certificate creates compounding risks: customs rejection at destination port due to missing CE or SGS documentation, structural failure when actual yield strength falls below A500 Grade C minimums, and project delays when on-site welding reveals inadequate zinc coverage at joints. Engineering specifications for municipal water networks reference ASTM A53 and A795 for fire protection — substituting unverified grades voids insurance coverage and exposes the EPC contractor to liability [NEED_CITE: liability implications of non-compliant steel materials in municipal infrastructure].
Why Global Buyers Source Galvanized Square Steel Pipe From Us
We operate 3 dedicated production lines covering 2,800+ specifications including non-standard sizes, eliminating the need to coordinate multiple suppliers for pipes, plates, and fabrication. Our proprietary sharp-corner rectangular tube technology — backed by 41 patents — delivers tighter corner radii that improve connection fit-up for structural frames. Every order is tested in our in-house laboratory before shipment, with full chemical and mechanical data recorded in the Mill Test Certificate. We hold CE certification under EN 10210/EN 10219, ISO 9001:2015, Singapore FPC, and accept SGS or BV third-party inspection at buyer’s request. Professional loading plans optimize container utilization for heavy galvanized pipes, reducing per-ton freight costs for shipments to the EU, North America, India, Southeast Asia, and the Middle East.
Documentation & Compliance
- Mill Test Certificate documenting A500 Grade B / A53 Grade B / S355JR chemical composition and mechanical properties per ASTM A500 / EN 10219
- CE certificate under EN 10210 / EN 10219 for EU market customs clearance and project compliance
- ISO 9001:2015 quality management system certificate covering full production and inspection process
- SGS or BV third-party inspection report for coating mass, dimensional tolerance, and mechanical testing
- Material traceability by heat number linking each Galvanized Square Steel Pipe bundle to its Mill Test Certificate
- Customs documents including packing list, Bill of Lading, and Certificate of Origin for destination port clearance
Packaging, Loading & Delivery
- Galvanized Square Steel Pipe bundles secured with steel strips and edge protectors to preserve the hot-dip zinc coating during ocean transit
- Plastic caps on pipe ends prevent zinc damage and moisture ingress for threaded and grooved end configurations
- Container loading plans optimized for 5.8 m / 6 m / 11 m / 12 m lengths to maximize weight utilization within 20ft and 40ft containers
- Heat number and steel grade (A500 Grade B / S355JR) stenciled on each bundle for site identification and traceability
- FOB / CIF / DDP shipping terms available with door-to-door logistics to 50+ countries
- Custom cutting to project-specific lengths available before galvanizing to ensure full zinc coverage on cut ends
Start Your Galvanized Square Steel Pipe Inquiry
Submit your specifications — side length, wall thickness, steel grade, quantity, and destination port — to receive a detailed quotation including unit price, delivery timeline, payment terms, and applicable Mill Test Certificate documentation. Non-standard sizes and custom end treatments are available upon request.
Request Quotation and Mill Test Certificate
Send your Galvanized Square Steel Pipe requirements via email to admin@sdxjysteel.com or WhatsApp at +86 188 5315 7756. We respond within 12 hours with pricing, certification details, and estimated production lead time.
