Description
Factory-Direct Galvanized SHS — 120 g/m² zinc layer verified per batch before shipment from Jinan.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square Steel Tube |
| Product Type | Square Steel Tube (SHS) |
| Steel Grade | 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 |
| 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 Galvanized / Pre-Galvanized |
| Surface Treatment | Galvanized (120 g/m² zinc layer) |
| Tolerance | ±1% |
| Ends | Plain ends, Beveled ends, Threaded ends, Grooved ends |
| Processing Service | Punching, Cutting, Bending |
| Application | Steel structures, Construction frames, Machinery parts, Scaffolding, Furniture, DIY shelving, Greenhouse frames, Fluid transportation, Power, Boiler, Petrochemical, Building industry |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Structural frames, scaffolding systems, building supports, bridge handrails |
| Agricultural & Light Commercial | Greenhouse frames, DIY shelving units, furniture frames, warehouse racking |
| Industrial & Mechanical | Machinery parts, fluid transport lines, power plant supports, petrochemical structures |
What Missing Zinc Thickness Costs on a Greenhouse Frame Order
A 60 g/m² coating where 120 g/m² was specified means the entire structure fails third-party inspection and must be re-galvanized locally — often at triple the original tube cost.
I watched a buyer in the Gulf open a container of pre-galvanized square tubes years ago, only to find the zinc flaking off before the greenhouse was even erected. The supplier had shipped 60 g instead of the contracted 120 g, and no one had checked before loading. That entire project was delayed weeks, and the buyer paid for re-galvanizing locally at a cost that wiped out any savings from choosing the cheaper offer. [NEED_CITE: EN 10219 cold-formed hollow section requirements for surface treatment and corrosion protection]
For buyers sourcing a galvanized square steel tube supplier, the real risk is not the unit price difference between 60 g and 120 g coatings — it is the hidden cost of customs rejection, failed site inspections, and structural corrosion appearing within months in humid or coastal environments. Every batch of 120 g/m² pre-galvanized SHS leaving Jinan is checked against the zinc layer specification before it is loaded, because the cost of getting it wrong falls on the buyer, not the mill.
How 120 g/m² Zinc Matches Coastal and Agricultural Environments
A galvanized square steel tube with a verified 120 g/m² zinc layer provides meaningful corrosion resistance for greenhouse structures, coastal scaffolding, and outdoor furniture frames where moisture and salt exposure accelerate rust. Hot-dip galvanizing delivers a thicker metallurgical bond for long-term burial or marine exposure, while pre-galvanized at 120 g/m² offers a uniform, smooth finish ideal for visible architectural applications and DIY shelving where appearance matters. The galvanized square steel tube supplier you choose should verify coating weight per batch, not just per order — because a single under-coated bundle can compromise an entire container.
Structural Compliance and Certification for Global Projects
Load-bearing frames and scaffolding systems require compliance with recognized engineering standards such as EN 1993 or AISC, and the steel grade must be traceable to a specific heat number through original mill test certificates. [NEED_CITE: steel grade equivalence between ASTM A500 and EN 10219 standards] For European projects, CE marking under EN 10210 / EN 10219 is mandatory for customs clearance; for North American buyers, ASTM A500 Grade B/C documentation must accompany every shipment. Custom lengths of 5.8 m, 6 m, or 11 m reduce on-site cutting waste, while plain, beveled, threaded, or grooved ends allow direct connection without secondary fabrication.
Steel Grade Selection and Galvanizing Process Explained
The steel grades listed — A53 Grade B, A500 Grade A/B/C, S355JR, SS400, STK400 — span the ASTM, EN, and JIS systems, allowing a single galvanized square steel tube supplier to serve projects across multiple regulatory zones without grade substitution confusion. S355JR offers higher yield strength than S235-class equivalents, making it suitable for heavier structural frames, while A500 Grade C provides tighter chemical control for welded connections in seismic zones. Hot-dip galvanizing immerses the formed tube in molten zinc, creating a metallurgical zinc-iron alloy layer that outperforms electro-galvanized coatings in corrosion life; pre-galvanized at 120 g/m² uses a continuous galvanizing line on the coil before forming, delivering a more uniform surface finish ideal for visible applications. Wall thickness tolerance of ±1% ensures that theoretical weight calculations match actual delivered weight, preventing disputes over invoiced tonnage. [NEED_CITE: hot-dip vs pre-galvanized coating thickness and corrosion performance comparison]
The Hidden Cost of Unverified Coating and Missing Certificates
Choosing a galvanized square steel tube supplier based solely on unit price exposes the buyer to three categories of hidden cost: customs detention due to missing CE or mill certificates, on-site rejection when coating thickness fails third-party inspection, and premature corrosion requiring full structural replacement. Engineering specifications referencing EN 10219 or ASTM A500 require documented proof of steel grade and coating weight — verbal assurance from a trading company is not sufficient. [NEED_CITE: customs clearance requirements for steel imports with CE and mill test certificates]
Why Buyers Choose Xin Jiyuan for Galvanized SHS
Every batch of galvanized square steel tube is produced on one of three in-house lines in Jinan, with original mill test certificates issued per heat number and available for SGS or BV third-party inspection before shipment. The factory holds ISO 9001:2015, Lloyd’s CE (EN 10210 / EN 10219), and FPC certifications, covering the full 21.3–660 mm size range in A53, A500, S355JR, SS400, and other grades. With 2,800+ specifications in ready stock and flexible MOQ from 1 ton, trial orders and full-container bulk shipments are both supported. Professional export documentation, container loading optimization, and volume discount programs for long-term partners ensure that repeat buyers receive consistent pricing and priority production scheduling.
Documentation & Compliance
- Mill test certificate documenting A500 Grade B/C chemical composition and yield strength per ASTM A500, issued per heat number
- CE certificate covering EN 10210 and EN 10219 for European customs clearance and structural compliance
- ISO 9001:2015 quality management certificate covering production and inspection processes
- SGS or BV third-party inspection report available on request, verifying zinc coating weight and dimensional tolerance
- Material traceability by heat number from raw coil to finished galvanized square steel tube
- Full 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 the 120 g/m² zinc coating during ocean transit
- Plastic caps on both ends with woven bag wrapping, standard seaworthy packing for 5.8 m / 6 m / 11 m lengths
- Container loading optimized for 21.3–660 mm size range, maximizing payload per 20ft or 40ft container
- Custom cut lengths available to reduce on-site waste for greenhouse frames and scaffolding projects
- Heat number and steel grade clearly marked on each bundle for site traceability
- FOB, CIF, and DDP delivery options with professional export documentation handling
Getting Your Galvanized SHS Quote Right the First Time
Submit your specification sheet — including size, wall thickness, steel grade, coating type (hot-dip or pre-galvanized 120 g/m²), quantity, and destination port — and receive a competitive bulk quote with volume discount pricing, delivery timeline, and available mill test certificate options within 12 hours.
Start Your Galvanized SHS Procurement
Send your requirements via email to admin@sdxinjiyuan.com or WhatsApp at +86 188 5315 7756 with specifications, steel grade, and destination to receive a detailed quotation and sample mill test certificate.
Frequently Asked Questions
Q: What is the difference between hot-dip galvanized and pre-galvanized 120 g/m² square tubes?
A: Hot-dip galvanizing immerses the formed tube in molten zinc, creating a thicker metallurgical coating suitable for heavy corrosion environments; pre-galvanized at 120 g/m² is applied to the coil before forming, offering a smoother, more uniform finish ideal for visible architectural and DIY applications.
Q: Can you provide mill test certificates for ASTM A500 and EN 10219 grades in the same order?
A: Yes, original mill test certificates are issued per heat number for each steel grade, and mixed-grade orders are supported with full documentation for customs and third-party inspection.
Q: What is the minimum order quantity for custom-length galvanized square tubes?
A: The MOQ is 1 ton, supporting both trial orders and full-container bulk shipments, with custom lengths of 5.8 m, 6 m, 11 m, or cut-to-size available.
Q: Do you offer third-party inspection before shipment?
A: Yes, SGS and BV third-party inspections are available on request to verify zinc coating weight, dimensional tolerance, and steel grade compliance before container loading.
Q: How do you optimize container loading for mixed-size galvanized SHS orders?
A: Our export team prepares detailed loading plans to maximize payload per container, combining multiple sizes from the 21.3–660 mm range while protecting the zinc coating with edge protectors and proper bundling.
