Description
Factory-Direct Galvanized SHS/RHS — ASTM-certified Q195-Q345 tubes rolled, galvanized, and inspected under one roof at our own mill in Jinan.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | Q195, Q235, Q345, A106, A53, A36, 10#, 20#, 45# |
| Standard | ASTM, API, CE, RoHS, BIS, SASO, JIS, ISO9001 |
| Section Shape | Square, Rectangular, Round |
| Size Range | Wall thickness 1.2–15.7 mm |
| Length | 6 m / 6.4 m / 12 m |
| Technique | Cold Rolled Based |
| Surface Treatment | Galvanized (Z81–Z120 coating) |
| Tolerance | ±1% |
| Spangle Type | Zero Spangle |
| Special Pipe | Thick Wall Pipe |
| Application | Steel structures, construction frames, containers, fences, corrugated sheets, small tools |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| General Construction | Building frames, column-beam assemblies, mezzanine platforms |
| Industrial Facilities | Warehouse portal frames, logistics center racking supports, plant pipe racks |
| Infrastructure | Highway sound barriers, fencing posts, bridge handrails |
| Container & Modular Build | Shipping container corner posts, prefab house skeletons |
| Agricultural & Utility | Equipment shelters, solar panel mounting frames, irrigation gantries |
Where Coating Weight Decides Whether Your Galvanized Square and Rectangular Steel Tube Survives Site Welding
Z81 versus Z120 is not a pricing question — it is a corrosion-life question that shows up two years after handover.
I still remember a warehouse job in Dubai where the client cut into a batch of galvanized tubes and the zinc started peeling like sunburned skin. Third-party testing showed 35μm on a contract that specified 65μm minimum. The whole lot came back, and the re-shipping and crane costs alone wiped out the margin we had built in over six months. That kind of failure does not come from bad intent — it comes from fabricators who buy black tube from three different mills, send it to a galvanizer they have never visited, and stamp their own logo on the bundle. When you source a galvanized square and rectangular steel tube from a vertically integrated producer, the coating weight is measured on the same floor where the tube was formed, and the heat number on the zinc report matches the heat number on the mill test certificate. [NEED_CITE: galvanizing coating thickness standards for structural hollow sections]
Matching Q195–Q345 Grades to Structural and Industrial Load Paths
A galvanized square and rectangular steel tube in Q235B carries typical bracing and secondary framing loads across warehouses and commercial buildings, while Q345 steps in when portal frames or crane-runway beams demand higher yield. The cold-rolled forming process behind these SHS and RHS profiles keeps wall thickness within ±1% tolerance, which matters when you are welding moment connections and need the fit-up gap to stay predictable. Zero-spangle galvanizing at Z81–Z120 gives a uniform matte finish that accepts paint systems directly if the project later moves to a coastal or chemical-exposure environment.
Engineering Compliance Across ASTM, CE, and Destination-Country Codes
Structural hollow sections shipped against ASTM A500 or A53 must carry chemistry and tensile data that trace back to the original heat — not a blended batch certificate. For EU-bound projects, EN 10219 cold-formed sections require CE marking and factory production control documentation that customs will check at the port of entry. [NEED_CITE: EN 10219 cold-formed structural hollow section compliance requirements] The Q-series grades we roll (Q195, Q235, Q345) map to international equivalents, and our engineering team prepares equivalence tables alongside the shop drawings so your consultant can approve substitution without a redesign cycle. Standard lengths of 6 m, 6.4 m, and 12 m are cut to order, and bevelled or grooved ends can be specified for field welding.
What Cold-Rolled Forming and Zero-Spangle Galvanizing Actually Mean for Your Frame
Cold-rolled based forming produces sharper corner radii and tighter dimensional consistency than hot-formed alternatives, which translates into cleaner weld prep and less grinding on site. The zero-spangle galvanizing finish eliminates the visible crystalline pattern of regular galvanized coatings, giving a smooth uniform surface that is preferred for exposed architectural frames and interior industrial structures where appearance matters. Zinc coating in the Z81–Z120 range covers everything from indoor dry environments (Z81) to moderately aggressive outdoor or industrial atmospheres (Z120). Thick-wall options up to 15.7 mm allow these galvanized square and rectangular steel tubes to serve as primary columns or heavy-duty equipment supports without stepping up to welded box sections. [NEED_CITE: cold-formed versus hot-formed structural hollow section dimensional tolerance comparison]
The Hidden Cost of Buying Galvanized Tube Without Verified Coating and Traceability
A tube that arrives with the right outer dimensions but the wrong zinc weight will pass visual inspection at the gate and fail two years later at the first salt-air exposure cycle. Material certificates that cannot be traced to a specific heat number become worthless the moment a structural inspector asks for verification. Missing or non-conforming CE or ASTM documentation does not just delay payment — it can hold an entire container at the destination port while the importer scrambles for retroactive test reports. [NEED_CITE: structural steel documentation requirements for customs clearance]
Why Project Teams Source Their Galvanized Square and Rectangular Steel Tube From Our Jinan Mill
Our own steel mill runs three production lines and stocks over 2,800 specifications of raw material, so the black tube that goes into the galvanizing bath was rolled, tested, and certified on the same site. Every bundle carries a heat-number sticker that links back to the chemical composition and mechanical test report in our quality system. Welding procedures are qualified to AWS and EN standards, and our welders hold current certifications — when you need fabricated assemblies rather than bare tubes, the transition from raw material to finished component happens without a hand-off to a third-party shop. We have shipped structural steel packages to the EU, Middle East, Southeast Asia, and Africa, and our documentation packs include WPS, PQR, weld maps, dimensional inspection reports, and coating thickness certificates in a format that satisfies main contractor handover requirements.
Documentation & Compliance
- Mill Test Certificate documenting Q195 / Q235 / Q345 chemical composition and mechanical properties per ASTM A500 / A53, traceable to original heat number
- CE certificate covering EN 10219 cold-formed structural hollow sections for EU project compliance
- ISO 9001 quality management certificate covering the integrated steel production and fabrication process
- SGS or BV third-party inspection report verifying galvanized coating thickness (Z81–Z120) and dimensional tolerance (±1%)
- Material traceability sheet linking each bundle heat number to galvanizing batch and coating weight test
- Full customs document set: packing list, bill of lading, certificate of origin, and ASTM / CE compliance declaration
Packaging, Loading & Delivery
- Galvanized square and rectangular steel tubes bundled with steel straps and edge protectors to prevent zinc coating damage during ocean transit
- Zero-spangle surface wrapped with waterproof paper and plastic sleeves to preserve the uniform finish in humid port storage conditions
- 6 m, 6.4 m, and 12 m lengths optimized for 20ft and 40ft open-top or flat-rack container loading, with oversized 12 m bundles shipped on breakbulk when project volume requires
- Custom cut-to-length service available for Q195–Q345 tubes, with ends bevelled or capped per drawing specification
- Heat number and steel grade stenciled on each bundle tag, matching the Mill Test Certificate for site verification
- FOB Jinan / Qingdao, CIF destination port, or DDP door-to-door delivery arranged with forwarders experienced in structural steel cargo
Getting Your Galvanized Square and Rectangular Steel Tube Quotation Moving
Send us your project drawings (PDF or DWG), the steel grade and coating weight you need, total tonnage, and destination port — we respond within 24 hours with a detailed quote covering material, fabrication, coating, packing, and shipping, plus a shop drawing timeline and production schedule. If your specification calls for non-standard lengths, fabricated assemblies, or third-party inspection, we confirm feasibility and lead time in the same reply.
Request Your Galvanized Square and Rectangular Steel Tube Quote and Mill Test Certificate
Share your drawings, steel grade, coating requirement, and destination port to receive a detailed quotation with full quality documentation.
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
