Description
Factory-Direct Pre-Galvanized SHS — Every Pre-Galvanized Square Steel Tube 120g Zinc Supplier bundle rolls off our own ERW line and galvanizing bath, so coating weight and dimensional tolerance stay locked from coil to container.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Pre-Galvanized Square Steel Tube |
| Product Type | Square Steel Tube (SHS) |
| Steel Grade | Q195, Q235, Q345B |
| Standard | GB/T 6728, ASTM A500, EN 10219, JIS G3466 |
| Section Shape | Square |
| Size Range | Customized |
| Wall Thickness | 0.5 mm – 20 mm |
| Length | 6 m / 12 m (standard); customizable |
| Technique | ERW, then pre-galvanized |
| Surface Treatment | Pre-Galvanized, 120 g/m² zinc coating |
| Ends | Plain / Cut to length |
| Application | DIY Shelving, Furniture Frames, Greenhouse Frames, Steel Structures, Construction Frames, Machinery, Scaffolding |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Light Steel Construction | Greenhouse frames, agricultural building skeletons, lean-to shelters |
| Interior & Furniture Manufacturing | Retail display stands, mezzanine racks, warehouse shelving uprights |
| Industrial Infrastructure | Machinery guards, conveyor supports, cable tray frames |
| Site Temporary Works | Scaffolding ledger tubes, handrail posts, protection barriers |
Where a 65 g/m² Zinc Reading Rejects an Entire Container
A Pre-Galvanized Square Steel Tube 120g Zinc Supplier that cannot prove coating weight on every bundle is a customs and site-acceptance risk.
I have watched a 20ft container of pre-galvanized square tubes get rejected at a Dubai site because the gauge read 65 g/m² instead of the specified 120 g/m² — the frames began rusting before bolting even started. The root cause is always the same: fragmented sourcing, where the trader cannot trace which coil fed which galvanizing line, and no X-ray fluorescence check is run before loading. [NEED_CITE: pre-galvanized steel tube coating weight testing methods] When buyers source from non-integrated suppliers, zinc consistency becomes a lottery, material traceability breaks, and processing delays pile up because cutting and punching are subcontracted elsewhere.
How Pre-Galvanized SHS Fits Greenhouse, Shelving and Furniture Engineering
A Pre-Galvanized Square Steel Tube 120g Zinc Supplier serving these sectors must deliver uniform zinc coverage at cut edges, straight lengths ready for bolting, and dimensional consistency that lets powder-coating lines run without rework. Because our steel mill feeds our own fabrication workshop, the same Q235 coil that becomes a greenhouse purlin also becomes a furniture frame upright — so coating weight, corner radius and straightness stay matched across the order.
Meeting EN 10219, ASTM A500 and GB/T 6728 on the Same Production Line
Structural frames for light buildings and shelving systems are typically designed to EN 1993 or AISC 360, which reference EN 10219 and ASTM A500 respectively for cold-formed hollow sections. [NEED_CITE: EN 10219 cold-formed structural hollow sections requirements] Q195 and Q235 map to S235-class performance for non-primary indoor frames, while Q345B covers higher-load greenhouse purlins and machinery supports. Pre-galvanizing at 120 g/m² is the correct finish for indoor and sheltered outdoor environments — it gives uniform corrosion protection without the spangle and thickness variation of hot-dip galvanizing, and it keeps wall thickness within the tighter tolerances that furniture and shelving designers specify. [NEED_CITE: pre-galvanized vs hot-dip galvanized steel tube corrosion performance]
Why Q195, Q235 and Q345B Are the Right Grades for This Finish
Q195 is the lightest structural grade in the Chinese system, used where forming and welding matter more than load capacity — typical for display stands and light shelving. Q235 is the workhorse grade, equivalent in usage to S235JR under EN 10219, and covers most greenhouse and scaffolding frames. Q345B steps up to higher yield for machinery bases and loaded conveyor supports. All three grades weld cleanly with MIG/MAG and resist zinc-induced cracking because the 120 g/m² pre-galvanized layer is thin enough that welders do not need to strip it before joining. The ERW seam is formed before galvanizing, so the zinc layer covers both the body and the weld line in one pass — there is no bare seam to rust first.
The Hidden Cost of Buying Pre-Galvanized SHS from a Trader
Choosing the wrong Pre-Galvanized Square Steel Tube 120g Zinc Supplier means paying twice: once for the tubes, and again for rework, rejection or customs hold. Material certificates that cannot be traced to a heat number fail EN 10219 and ASTM A500 audits; coating weights below spec trigger third-party inspector rejection on site; and oversized or under-tolerance bundles force the contractor to re-sort before assembly. [NEED_CITE: structural steel fabrication quality audit requirements EN 1090] None of these costs appear on the proforma invoice, but they show up as delayed handover, warranty claims and lost tenders.
Why Buyers Source This Pre-Galvanized SHS from an Integrated Mill
Our Jinan facility runs its own steel production lines and fabricates in the same yard, so the Pre-Galvanized Square Steel Tube 120g Zinc Supplier you deal with controls the coil, the ERW weld, the galvanizing bath and the cutting saw. Every bundle is X-ray fluorescence tested for the 120 g/m² coating weight before dispatch, and the report travels with the MTC. More than 2,800 size specifications are held in stock, so custom lengths for greenhouse purlins or shelving uprights can be cut, punched and bent in-house without subcontracting. Third-party inspectors from SGS, BV and TÜV are welcomed on site, and CE / EN 10219 documentation is issued as standard for EU-bound shipments.
Documentation & Compliance
- Mill Test Certificate documenting Q195, Q235 or Q345B chemical composition and mechanical properties per GB/T 6728, with heat number traceability.
- CE certificate covering EN 10219 cold-formed structural hollow sections for EU market compliance.
- ISO 9001 quality management certificate covering both steel production and fabrication operations.
- SGS or BV third-party inspection report verifying 120 g/m² zinc coating weight, dimensional tolerance and surface quality.
- Material traceability sheet linking each bundle to its heat number, coil ID and galvanizing batch.
- Full customs pack: packing list, bill of lading, certificate of origin and commercial invoice aligned with ASTM A500 or EN 10219 order specs.
Packaging, Loading & Delivery
- Pre-Galvanized Square Steel Tube 120g Zinc bundles are strapped with steel strips and wrapped with waterproof paper, with edge protectors preserving the 120 g/m² zinc layer during ocean transit.
- Standard lengths of 6 m and 12 m are loaded to maximize 20ft and 40ft container payload; custom-cut lengths for greenhouse frames are nested to avoid wasted space.
- Each bundle carries a tag showing steel grade (Q195 / Q235 / Q345B), heat number, size and coating weight, so site identification is instant.
- Cutting, punching and bending services are completed before packing, so tubes arrive site-ready for shelving and furniture assembly.
- Shipment terms include FOB, CIF and DDP, with door-to-door tracking to Middle East, EU, Southeast Asia and Africa ports.
Getting a Firm Quote on Pre-Galvanized SHS for Your Project
Send your drawing set or size schedule — section dimensions, wall thickness, steel grade, length, coating requirement and destination port — and we return a quote covering material, fabrication, coating, packing and freight, together with the shop drawing timeline and MTC sample. For greenhouse, shelving or furniture programs, we also provide nesting suggestions that reduce offcut waste and optimize container loading.
Frequently Asked Questions
Q: How do you verify the 120 g/m² zinc coating on every bundle?
A: Every Pre-Galvanized Square Steel Tube 120g Zinc bundle is tested with X-ray fluorescence before leaving the Jinan warehouse, and the coating report is included in the QC package alongside the MTC.
Q: Can you cut, punch and bend pre-galvanized square tubes to my drawing?
A: Yes. CNC cutting, punching and bending are done in-house on the same site as the galvanizing line, so custom lengths for shelving uprights or greenhouse frames are processed and packed together.
Q: What is the difference between pre-galvanized and hot-dip galvanized square tubes?
A: Pre-galvanized tubes carry a thinner, more uniform zinc layer suited to indoor and sheltered outdoor use such as furniture and shelving; hot-dip galvanizing gives a thicker coating for heavy outdoor exposure but with more spangle and thickness variation.
Q: Do you supply EN 10219 and ASTM A500 certification for EU and North American projects?
A: Yes. CE / EN 10219 certificates are issued for EU shipments, and ASTM A500 documentation is provided for North American orders, with third-party inspection from SGS, BV or TÜV available on request.
Q: What is the lead time for custom-size pre-galvanized square tubes?
A: Stock sizes ship on typical production lead times; custom-cut or processed tubes follow drawing approval and deposit, with the schedule confirmed in the quotation.
[Request Your Pre-Galvanized SHS Quote and MTC Today]
Share your size schedule, steel grade, quantity and destination port to receive a full quotation with mill test certificate sample and shop drawing timeline.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile / WhatsApp / WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Website: www.xjystructure.com
