Description
Mill-Direct Galvanized SHS — ASTM A53 / A500 / S355JR grades, 21.3–660 mm, hot-dip coated and shipped with full EN 10204 3.1 mill test certificates.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square Steel Pipe |
| Product Type | Square Steel Tube (SHS) |
| Steel Grade | A53 Grade B / A500 Grade A / A500 Grade B / A500 Grade C / STK400 / SS400 / ST42.2 / S355JR |
| Standard | ASTM A53 / ASTM A500 / ASTM A36 / ASTM A795 / BS 1387 / EN 10255 / ISO 65 / ANSI C80 / DIN 2440 / JIS G3444 / GB/T 3091 / GB/T 13793 |
| Section Shape | Square |
| Size Range | 21.3 mm – 660 mm (1/2″ – 26″) |
| Wall Thickness | 6 mm |
| Length | 5.8 m / 6 m / 11 m or customized |
| Technique | Hot-dip Galvanizing |
| Surface Treatment | Galvanized |
| Tolerance | ±1% / ±5% |
| Ends | Plain ends / Beveled ends / Threaded ends / Grooved ends |
| Application | Municipal water & gas transmission / Construction / Structural frames / Machinery parts / Petrochemical support |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Municipal Infrastructure | Water distribution mains, gas transmission pipelines, drainage culverts |
| Industrial Construction | Warehouse portal frames, mezzanine columns, equipment support platforms |
| Petrochemical | Pipe rack structures, process support frames, cable tray systems |
| Power & Energy | Substation structural frames, solar mounting structures, boiler support columns |
| Machinery & Equipment | Hydraulic cylinder housings, conveyor frame members, machine base structures |
What Zinc Coating Thickness Actually Determines on a Municipal Pipeline Job
The difference between 45 μm and 65 μm is not a lab report detail — it is the line between passing site inspection and shipping an entire container back for re-galvanizing.
Sourcing a galvanized square steel pipe overseas means the zinc layer is invisible until a third-party inspector pulls out a coating thickness gauge at the destination port. Pre-galvanized and electro-galvanized alternatives look identical on the outside, but their corrosion resistance in buried or submerged municipal environments degrades within months. [NEED_CITE: hot-dip galvanizing coating thickness requirements per ASTM A123] When the coating fails to meet the specified minimum, the entire batch becomes subject to rejection, re-work, and schedule delays that no amount of email correspondence can recover.
Matching Hot-Dip Galvanized SHS to Structural and Fluid Transmission Demands
A galvanized square steel pipe in A500 Grade B or S355JR serves dual roles — it carries structural loads in frames and columns while simultaneously resisting internal and external corrosion in fluid transmission environments. The hot-dip process metallurgically bonds the zinc to the steel substrate, producing a coating that withstands handling, welding at connection points, and decades of buried service. For EPC projects spanning municipal water networks and industrial pipe racks, specifying one consistent galvanized square steel pipe grade across both applications simplifies procurement, reduces warehouse segregation, and eliminates the risk of mixing pre-galvanized and hot-dip components on site.
Engineering Compliance Across ASTM, EN, and JIS Frameworks
Structural frames designed to AISC or EN 1993 require hollow sections that conform to dimensional and mechanical standards — ASTM A500 for North American projects, EN 10219 for European structures, and JIS G3444 for Japanese-spec installations. [NEED_CITE: EN 10219 cold-formed structural hollow section dimensional tolerances] The galvanized square steel pipe we produce covers all three systems through A53 Grade B, A500 Grade A/B/C, S355JR, and SS400 grades, allowing a single purchase order to serve mixed-standard projects. End treatments — plain, beveled, threaded, or grooved — align with the connection design specified in the shop drawings, whether the engineer calls for welded moment connections or mechanical groove couplings.
Steel Grade Selection and Hot-Dip Galvanizing Process Explained
The A500 grade system progresses from Grade A through Grade C with increasing yield strength, directly affecting the load-bearing capacity of columns and beam-and-column assemblies in warehouse and industrial frames. S355JR, the European equivalent widely used in EN 10219 hollow sections, offers higher strength-to-weight ratios that reduce member sizes and overall tonnage. Hot-dip galvanizing immerses the fabricated square tube in molten zinc at approximately 450°C, forming a series of zinc-iron alloy layers beneath a pure zinc outer coat — this metallurgical bond is what distinguishes it from pre-galvanized sheet-formed tubes where the zinc coating is mechanically applied before rolling. [NEED_CITE: metallurgical structure of hot-dip galvanized coating per ASTM A123] For wall thickness at 6 mm across the 21.3–660 mm range, the galvanizing bath penetration ensures both external and internal surfaces receive uniform coating protection, critical for sealed hollow sections used in outdoor or corrosive atmospheres.
Hidden Costs of Procuring the Wrong Galvanized Specification
Ordering a galvanized square steel pipe that meets only commercial-grade galvanizing standards for a structural or buried-pipeline application creates costs that appear long after the invoice is paid. Coating thickness below the project specification triggers third-party inspection failures at destination, forcing re-galvanizing or outright rejection — both of which add weeks to the critical path. Material certificates that cannot be traced to specific heat numbers create audit gaps during EN 1090 or AISC certification reviews. [NEED_CITE: material traceability requirements under EN 1090 execution class 2 and above] Negative tolerance on wall thickness that exceeds the standard allowance reduces the actual load-bearing capacity below the engineer’s design assumptions, creating a structural safety liability that no amount of cost savings can justify.
Why Project Teams Source Their Galvanized Square Steel Pipe From Our Mill
Our facility operates as a vertically integrated producer — the same steel mill that melts the slab and rolls the strip also fabricates the square tube and galvanizes the finished product. This eliminates the material traceability gap that occurs when a fabricator sources raw tubes from third-party suppliers and then subcontracts galvanizing elsewhere. Every galvanized square steel pipe leaving our workshop carries a mill test certificate traceable to the original heat number, with chemical composition and mechanical properties documented per the specified standard. We maintain over 2,800 specifications of raw material in stock, meaning mixed-grade orders combining A500 Grade B for structural columns and A53 Grade B for fluid transmission lines ship from a single source with unified quality documentation. Our welding procedures and welder qualifications are certified to AWS and EN standards, and our quality documentation package includes WPS, PQR, weld maps, dimensional inspection reports, and coating thickness measurements — the complete file that general contractors and EPC firms need for project handover.
Documentation & Compliance
- Mill test certificate documenting A53 Grade B / A500 Grade B / S355JR chemical composition, yield strength, and tensile properties per ASTM A500 or EN 10219
- CE certification under EN 10210 / EN 10219 for structural hollow sections exported to European Union member states
- ISO 9001 quality management system certificate covering the full production chain from steelmaking through hot-dip galvanizing
- SGS or BV third-party inspection report verifying zinc coating thickness, dimensional tolerances, and surface quality prior to shipment
- Full material traceability by heat number linking each galvanized square steel pipe bundle to its original steelmaking batch and galvanizing dip record
- Export documentation package including commercial invoice, packing list, bill of lading, and certificate of origin for customs clearance at destination port
Packaging, Loading & Delivery
- Hot-dip galvanized square steel tubes bundled with steel straps and edge protectors to prevent zinc coating damage from friction during ocean transit
- Plastic end caps fitted on all tube ends to preserve threaded, grooved, or beveled finishes and prevent moisture ingress during storage and shipping
- Container loading optimized for 5.8 m and 6 m lengths in 20-foot containers and 11 m lengths in 40-foot open-top or flat-rack containers, maximizing payload per shipment
- Custom cutting to project-specified lengths available, with each piece marked with heat number, steel grade, and size for on-site identification
- Shipment terms available as FOB, CIF, or DDP, with professional lashing and securing plans for oversized galvanized square steel pipe bundles exceeding standard container dimensions
Starting Your Galvanized Square Steel Pipe Inquiry
Submit your project drawings or specification sheet indicating the required steel grade, size range, wall thickness, length, end treatment, and destination port. Our engineering team responds within 24 hours with a detailed quotation covering material, hot-dip galvanizing, packaging, and shipping costs, along with a shop drawing timeline and production schedule. For projects requiring mixed standards — such as ASTM A500 for structural members and A53 for fluid lines — we consolidate all grades under a single purchase order with unified mill test certification.
Request Your Quotation and Mill Test Certificate Today
Share your project specifications, steel grade requirements, and target quantity to receive a detailed quotation with full material documentation.
Contact:
- Website: www.xjystructure.com
- Tel: +86 531 8573 6315
- Mobile / WhatsApp / WeChat: +86 188 5315 7756
- Email: admin@xjystructure.com
