Description
Full-Range Galvanized SHS/RHS Stock — XJY Structure holds 2,800+ specifications in-house, covering Q195 to Q345 grades in wall thicknesses from 1.2 mm to 15.7 mm, eliminating multi-supplier coordination for structural tube orders.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square & Rectangular Thick Wall Steel Pipe |
| Product Type | Galvanized SHS / RHS / Round Tube |
| Steel Grade | Q195, Q235, Q345, A36, A53, A106, 10#, 20#, 45# |
| Standard | ASTM, CE, RoHS, BIS, SASO, SABS, JIS, ISO9001, API |
| Section Shape | Square, Rectangular, Round |
| Wall Thickness | 1.2 – 15.7 mm |
| Length | 6 m, 6.4 m, 12 m |
| Technique | Cold Rolled Based / Welded |
| Surface Treatment | Galvanized (Z81–Z120), Zero Spangle, Non-oiled |
| Tolerance | ±1% |
| Hardness | Mid Hard |
| Skin Pass | Yes |
| Application | Steel structures, construction frames, containers, fences, corrugated sheets |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC / Industrial Construction | Portal frame columns, roof trusses, mezzanine beam grids |
| Warehousing & Logistics | Racking uprights, conveyor support frames, loading dock structures |
| Container & Modular Build | Corner castings, floor cross-members, wall purlins |
| Infrastructure & Fencing | Highway guardrail posts, perimeter fencing rails, sign gantry legs |
| Agricultural Structures | Greenhouse arches, equipment shed frames, livestock housing |
When Coating Weight Dictates Structural Service Life
Z81 versus Z120 galvanizing is not a pricing detail — it determines whether a frame survives five years or fifteen in a corrosive environment.
Overseas buyers sourcing galvanized tubes from trading companies often receive inconsistent coating weights across bundles. One lot arrives at Z120, the next at Z60 — visually identical until salt-spray testing reveals the gap. On an EPC warehouse project in West Africa, underspecified zinc coating led to white rust formation within eighteen months, forcing full re-coating at triple the original material cost [NEED_CITE: galvanized coating thickness classification per ASTM A123 and EN ISO 1461]. When procurement is fragmented between a tube mill and a separate galvanizing line, traceability breaks at the coating stage, leaving the buyer unable to prove compliance during third-party inspection.
Matching Wall Thickness to Structural Load Paths
For portal frame columns and primary beam grids, the 8–15.7 mm wall range in Q345 grade delivers the section modulus required for multi-story industrial buildings without resorting to heavier hot-rolled profiles. Secondary members — purlins, girts, bracing tubes — typically specify Q235 in the 1.2–5 mm range, where the Galvanized Square and Rectangular Steel Tube Supplier can consolidate both weight classes into a single shipment. The ±1% wall tolerance ensures that section property calculations remain valid across the full bundle, avoiding the structural engineer’s recurring frustration of receiving tubes at the negative edge of tolerance that fail load verification [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements].
Compliance Frameworks Across Export Markets
European projects demand CE marking under EN 10219 for cold-formed welded hollow sections, with Factory Production Control audits and Declaration of Performance documentation. North American buyers reference ASTM A500 Grade B/C or A53 for structural tube, requiring mill test certificates aligned with AISC reporting formats. Middle East tenders frequently specify SASO compliance, while Southeast Asian infrastructure programs accept JIS or BIS equivalents. A Galvanized Square and Rectangular Steel Tube Supplier operating an integrated mill-to-fabrication facility issues a single certification chain covering both the base steel chemistry and the galvanized coating weight, eliminating the documentation gaps that arise when material sourcing and surface treatment are split between vendors [NEED_CITE: steel grade equivalence mapping between EN 10219 and ASTM A500 standards].
Steel Grade Selection and Cold-Forming Behavior
The Q-series grades (Q195, Q235, Q345) follow the Chinese GB/T 700 and GB/T 1591 classification, where the numeric suffix indicates minimum yield strength in MPa. Q235 remains the workhorse for general structural frames, while Q345 serves load-bearing columns and crane-supporting beams. When these grades map to international equivalents, Q235 aligns with S235JR / A36, and Q345 corresponds to S355JR / A572 Grade 50. The cold-rolled based technique with skin pass treatment produces a uniform surface finish critical for consistent zinc adhesion — a factor that directly affects coating longevity. Zero spangle galvanizing (Z81–Z120) provides a smooth, paintable surface preferred in architectural applications where appearance matters alongside corrosion protection.
The Hidden Cost of Unverified Coating and Negative Tolerance
Purchasing galvanized tubes without third-party coating verification creates two failure modes. First, zinc thickness below specification accelerates corrosion, shortening service life and triggering warranty claims on completed structures. Second, wall thickness at the extreme negative tolerance reduces actual section modulus below the engineer’s design assumptions, potentially causing deflection failures under live load. Both defects remain invisible until on-site NDT or destructive testing — by which point the tubes are already welded into the frame. Replacing fabricated members costs far more than the original material price difference between a verified and unverified supplier [NEED_CITE: structural hollow section tolerance impact on load-bearing capacity per EN 10219-2].
Integrated Mill and Fabrication Under One Roof
XJY Structure operates its own steel production facility with three rolling lines and maintains over 2,800 tube specifications in stock, meaning the same facility that produces the base steel also performs cutting, drilling, welding, and galvanizing. This vertical integration closes the traceability gap: every heat number on the mill test certificate links directly to the galvanized coating report and the final dimensional inspection data. Certified welding procedures (WPS/PQR) and qualified welders hold AWS and EN certifications, ensuring that any fabrication work performed on the tubes meets international structural codes. The engineering team reviews shop drawings before production begins, catching connection detail conflicts that would otherwise generate RFI delays and rework costs on the project timeline.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and yield strength per GB/T 700 and GB/T 1591, with heat number traceability from raw slab to finished galvanized tube
- CE certificate covering EN 10219 cold-formed welded structural hollow sections, including Declaration of Performance for European market customs clearance
- ISO 9001 quality management certificate validating the integrated production and inspection workflow from steelmaking through galvanizing and final packing
- SGS or BV third-party inspection report verifying galvanized coating thickness (Z81–Z120), wall tolerance (±1%), and dimensional accuracy per purchase specifications
- Material traceability report linking each bundle’s heat number to base steel chemistry, galvanizing bath records, and final coating weight measurement
- Complete export documentation package including commercial invoice, packing list, bill of lading, and certificate of origin formatted for destination-country customs requirements
Packaging, Loading & Delivery
- Galvanized SHS/RHS bundles secured with steel strips and edge protectors to prevent zinc coating damage from friction during ocean transit, with each bundle tagged by steel grade, wall thickness, and heat number
- Zero spangle galvanized surfaces wrapped in waterproof paper sleeves before bundling to prevent white rust formation from condensation during container shipping
- 6 m and 12 m lengths optimized for 20ft and 40ft open-top container loading, with nested rectangular tubes maximizing payload per shipment and reducing per-ton freight cost
- Custom cutting to project-specific lengths available before galvanizing, eliminating on-site cold-saw work and preserving coating integrity at cut edges
- Shipping terms available as FOB, CIF, or DDP, with professional lashing plans for oversized thick-wall bundles exceeding standard container door clearance
Starting Your Galvanized Tube Procurement
Submit your project drawings or bill of materials specifying steel grade, section dimensions, wall thickness, coating class (Z81 or Z120), and destination port. The engineering team responds within 24 hours with a preliminary technical assessment, followed by a detailed quotation covering material, fabrication, coating, packing, and freight — including shop drawing timelines and production scheduling.
Request Quotation with Mill Test Certificate
Send your specifications and required standards to receive pricing, coating verification documentation, and production lead time confirmation.
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Frequently Asked Questions
Q: What is the difference between Z81 and Z120 galvanized coating, and how do I choose?
A: Z81 and Z120 refer to the zinc coating weight in grams per square meter. Z120 provides thicker zinc coverage and longer corrosion resistance, suitable for outdoor structural applications and harsh environments. Z81 is adequate for indoor or sheltered installations. The choice depends on your project’s environmental exposure and design service life requirements.
Q: Can you provide material traceability from raw steel to finished galvanized tube?
A: Yes. As an integrated manufacturer with our own steel mill, we maintain full traceability from raw slab heat number through cold-forming, welding, and galvanizing. Each bundle carries a unique heat number linked to the mill test certificate and coating inspection report.
Q: Do you offer custom cutting, bending, and welding services for galvanized tubes?
A: Yes. Our fabrication workshop provides CNC cutting, drilling, bending, and MIG/MAG/SAW welding per project shop drawings. All fabrication follows certified WPS procedures with qualified welders holding AWS and EN certifications.
Q: Which international standards do your galvanized SHS/RHS products comply with?
A: Our products meet ASTM, EN 10219, JIS, BIS, SASO, and SABS requirements depending on the destination market. We hold CE certification for European projects and can arrange third-party inspection by SGS or BV for coating thickness and dimensional verification.
Q: How do you handle shipping for thick-wall galvanized tube bundles?
A: We provide professional packing with edge protectors to preserve the zinc coating, optimized container loading plans for 6 m and 12 m lengths, and complete export documentation. Shipping terms include FOB, CIF, and DDP with tracking until site delivery.
Get Your Galvanized SHS/RHS Quote Today
Upload your project specifications, steel grade requirements, and coating class preference to receive a detailed quotation with mill test certificate documentation and production scheduling.
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
