Description
Factory-Direct Galvanized Supply — All A500 and pre-galvanized square tubes roll from our own mill with 120 g/m² zinc coating verified in-house before shipment.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square Steel Tube |
| Product Type | Galvanized Square Steel Tube |
| Steel Grade | A53 Grade B / A500 Grade A / Grade B / 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 custom |
| Technique | Hot-dip Galvanizing / Pre-Galvanized |
| Surface Treatment | Galvanized (120 g/m² zinc layer) |
| Tolerance | ±1% / ±5% |
| Pipe Ends | Plain ends / Beveled ends / Threaded ends / Grooved ends |
| Processing Service | Punching / Cutting / Bending |
| Package | Plastic caps on both ends + woven bag wrapped + tied in bundle; standard seaworthy packing |
| Application | DIY shelving / Furniture frames / Greenhouse frames / Fluid transportation / Construction / Hydraulic precision machinery parts / Power / Boiler / Petrochemical / Building industry |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Building | Structural frames for warehouses, greenhouse skeletons, modular building supports |
| Furniture & Interior | DIY shelving uprights, display rack frames, mezzanine structures |
| Machinery & Industrial | Hydraulic machinery housings, conveyor supports, petrochemical pipe racks |
| Agriculture | Greenhouse purlins, irrigation framework, livestock shelter frames |
| Power & Energy | Solar mounting structures, cable tray supports, boiler framing |
What Zinc Coating Weight Actually Means for Your Project Budget
A 120 g/m² zinc layer is the threshold where pre-galvanized square tube stops being a cosmetic finish and starts functioning as real corrosion protection.
Specifiers often assume any galvanized surface delivers equal service life, then watch fastener holes rust through within a single humid season. Pre-galvanized Pre-Galvanized Square Pipe 120g Zinc Layer Supplier stock typically carries a lighter coating suited to indoor shelving and furniture — once the same tube moves outdoors into a greenhouse or coastal facade, the zinc depletes faster than expected and repaint cycles eat the original savings. [NEED_CITE: zinc coating weight vs. service life in corrosive environments]
Matching Coating Process to Exposure Conditions
Choosing between pre-galvanized and hot-dip galvanized square tube is not a price decision — it is a service-life decision. Pre-galvanized Pre-Galvanized Square Pipe 120g Zinc Layer Supplier material delivers a uniform, aesthetically smooth finish ideal for indoor DIY shelving, furniture frames, and interior greenhouse purlins where humidity stays moderate. Hot-dip galvanizing builds a thicker metallurgical bond suited to outdoor construction, petrochemical pipe racks, and coastal solar mounts. Both processes are available across the 21.3 mm – 660 mm size range with plain, beveled, threaded, or grooved ends ready for direct site integration.
Structural Compliance and Certification Pathways
Engineering frames carrying load — greenhouse skeletons supporting snow, mezzanine structures holding pallets, machinery housings transmitting vibration — must satisfy dimensional tolerance and grade traceability requirements under EN 10219 or ASTM A500 frameworks. [NEED_CITE: EN 10219 cold-formed structural hollow section dimensional tolerances] A500 Grade B and Grade C dominate North American structural orders, while S355JR and STK400 serve European and Japanese spec drawings. Missing CE marking under EN 10210/EN 10219 blocks EU customs clearance entirely; missing mill test chemistry blocks third-party inspection sign-off. Custom cut-to-length and in-line bending reduce on-site rework, but only when the base tube already meets the specified tolerance band.
Steel Grade Selection and Galvanizing Process Explained
A500 Grade A, B, and C represent ascending yield strength tiers within the ASTM system — Grade C delivers roughly double the yield of Grade A, directly influencing member sizing in load-bearing frames. STK400 and SS400 serve Japanese and general structural applications, while S355JR covers European EN 10210 requirements. The galvanizing process itself matters: pre-galvanized coil is coated before forming, producing a smooth uniform surface ideal for visible furniture and shelving; hot-dip galvanizing coats the finished tube, building thicker zinc at corners and weld seams where corrosion attacks first. Wall thickness at 6 mm across the 21.3 mm – 660 mm range covers everything from light furniture uprights to heavy greenhouse columns. Tolerance at ±1% holds dimensional accuracy for precision machinery housings, while ±5% suffices for general construction framing.
Hidden Costs of Incorrect Grade or Coating Specification
Ordering A500 Grade A when the structural drawing calls for Grade C forces member upsizing, more welds, and heavier foundations — or worse, passing inspection with an under-rated frame that fails under live load. [NEED_CITE: ASTM A500 grade selection for structural applications] Zinc coating below the specified 120 g/m² passes visual inspection but corrodes through within months in humid environments, triggering repaint claims and reputational damage. Missing heat-number traceability on the mill test certificate blocks third-party inspection approval, delaying customs clearance and stranding the container at port.
Why Engineering Buyers Source From Our Mill
Every Pre-Galvanized Square Pipe 120g Zinc Layer Supplier order rolls through our three production lines covering 2,800+ specifications, with wall thickness capability up to 40 mm for heavy structural sections. Our in-house physical and chemical laboratory tests every heat for composition and mechanical properties before release — no batch ships without a matching mill test certificate. Full international certification under ISO 9001:2015, Lloyd’s CE (EN 10210/EN 10219), and Singapore FPC clears customs across EU, Middle East, and Southeast Asian ports. Our patented sharp-corner rectangular tube technology — holding 41 invention patents — delivers right-angle aesthetics for glass curtain walls and architectural facades where standard rounded-corner tubes look unfinished. Custom non-standard sizes, cut-to-length, punching, and bending services reduce fabrication steps at your workshop. Professional container loading with anti-damage measures protects the zinc coating during ocean transit, and we export to 50+ countries with complete documentation.
Documentation & Compliance
- Mill test certificate documenting A500 Grade B/C chemical composition and yield strength per ASTM A500
- CE certificate under EN 10210/EN 10219 for structural hollow section compliance in EU markets
- ISO 9001:2015 quality management certificate covering production and testing processes
- SGS or BV third-party inspection report verifying zinc coating thickness and dimensional tolerance
- Full material traceability by heat number from coil to finished Pre-Galvanized Square Pipe 120g Zinc Layer Supplier tube
- Customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Pre-galvanized A500 square tubes bundled with steel strips and edge protectors to preserve the 120 g/m² zinc coating during ocean transit
- Plastic caps on both ends prevent moisture ingress and protect beveled/threaded/grooved end treatments
- Woven bag wrapping and seaworthy bundling suits 5.8 m / 6 m / 11 m standard lengths or custom cut sizes
- Container loading optimized for 21.3 mm – 660 mm size range with anti-damage measures preventing zinc surface scratching
- Heat number and steel grade marking on each tube ensures site traceability and inspection readiness
- FOB / CIF / DDP shipping terms with professional loading supervision and tracking until arrival
Starting Your Procurement Process
Submit your specification drawing with side length, wall thickness, steel grade (A500 Grade A/B/C, S355JR, STK400), surface treatment preference (pre-galvanized 120 g/m² or hot-dip), quantity, and destination port. We respond within 12 hours with unit pricing, production lead time, and shipping terms — plus mill test certificate samples for your quality team review. Third-party inspection by SGS or BV can be arranged before shipment for additional assurance.
Frequently Asked Questions
Q: What is the difference between pre-galvanized and hot-dip galvanized square tube?
A: Pre-galvanized Pre-Galvanized Square Pipe 120g Zinc Layer Supplier material is coated before forming, producing a smooth uniform finish ideal for indoor applications like DIY shelving and furniture frames. Hot-dip galvanizing coats the finished tube, building thicker zinc at corners and weld seams for outdoor exposure in construction and greenhouse applications.
Q: How do I verify the zinc coating thickness meets 120 g/m² specification?
A: We provide mill test certificates documenting coating weight per batch. Third-party inspection by SGS or BV can perform magnetic thickness gauge testing and adhesion tests before shipment. Our in-house laboratory also re-tests every batch prior to release.
Q: Can I order custom non-standard sizes with low MOQ?
A: Yes. Our 2,800+ specification range covers 21.3 mm – 660 mm side lengths with wall thickness up to 40 mm. Custom cut-to-length, punching, and bending services are available with 1 Ton MOQ for both pre-galvanized and hot-dip galvanized square tubes.
Q: What certifications do you provide for EU and North American markets?
A: Full international certification includes ISO 9001:2015, Lloyd’s CE under EN 10210/EN 10219 for EU structural compliance, Singapore FPC, and ASTM A500/A53 material test certificates for North American projects. SGS/BV third-party inspection reports available on request.
Q: How do you protect the galvanized surface during container loading?
A: Pre-galvanized Pre-Galvanized Square Pipe 120g Zinc Layer Supplier tubes are bundled with edge protectors, wrapped in woven bags, and loaded with anti-damage measures preventing zinc coating scratches. Plastic caps protect end treatments. Professional loading supervision ensures secure stowage for ocean transit.
Request Your Pre-Galvanized Square Pipe Quote
Submit side length, wall thickness, steel grade, quantity, and destination port to receive pricing, mill test certificate samples, and production lead time within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjypipe.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
