Description
Factory-Direct Galvanized SHS/RHS — 2,800+ specifications in stock, shipped with original mill test certificates
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | S235, S275, SS400, Q235B, Q345B |
| Standard | EN 10219 / EN 10210 / ASTM A500 / JIS G3466 / GB/T 6728 / GB/T 3091 |
| Section Shape | Square / Rectangular |
| Size Range | 20×20 mm – 600×600 mm |
| Wall Thickness | 0.8 – 30 mm |
| Length | 6 m / 12 m (custom lengths available) |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Hot-dip Galvanized / Pre-Galvanized |
| Tolerance | ±1% |
| Ends | Plain ends / Beveled ends |
| Application | Steel structures / Construction frames / Machinery parts / Scaffolding / Furniture / Greenhouse / Fencing |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, scaffolding systems, structural columns, roof trusses |
| Machinery & Equipment | Hydraulic machine frames, conveyor structures, industrial platforms |
| Agriculture & Commercial | Greenhouse skeletons, furniture frames, perimeter fencing, signage supports |
What Wall-Thickness Tolerance Costs on a Galvanized Square and Rectangular Steel Tube Order
A ±1% tolerance on wall thickness is the difference between passing third-party inspection and watching a full container sit at port for two weeks.
I learned this the hard way years ago — a batch of 300×60 galvanized square tubes shipped to West Africa with wall thickness drifting into 8% negative tolerance. The theoretical weight and actual weight differed by nearly a ton per container. The client’s third-party inspector rejected the entire lot. That kind of mismatch does not just cost money in reshipment; it erodes the trust that took years to build. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
When procurement teams source galvanized SHS and RHS from fragmented suppliers, tolerance inconsistency is one of the most common failure points. Steel grade certificates may look correct on paper, but if the physical product does not match the stated dimensions, project engineers cannot sign off on structural calculations. The Galvanized Square and Rectangular Steel Tube we produce runs through three-stage in-house inspection before any batch leaves the mill floor — every heat number is verified against actual wall measurements.
Matching Structural Load Requirements Across Construction and Machinery Frames
Galvanized square and rectangular steel tubes in S235 through Q345B grades cover a wide structural envelope. For light-gauge framing in greenhouses and fencing, the 0.8 mm wall thickness in pre-galvanized finish keeps material costs down while providing adequate corrosion resistance in non-aggressive environments. When the same Galvanized Square and Rectangular Steel Tube moves into machinery frames or scaffolding systems, the 1.5–6 mm range in hot-dip galvanized finish handles repeated load cycles and outdoor exposure. Our 3 production lines run standard sizes from 20×20 mm up to 600×600 mm simultaneously, meaning a single order can consolidate structural columns, purlin supports, and brace tubes into one container without splitting across vendors.
Engineering Compliance and Certification Pathways for EU and Global Markets
Structural hollow sections destined for European construction sites must conform to EN 10219 for cold-formed welded profiles or EN 10210 for finished dimensions and tolerances. [NEED_CITE: EN 10219 vs EN 10210 compliance requirements for structural hollow sections] The Galvanized Square and Rectangular Steel Tube we supply carries CE certification under both EN 10210 and EN 10219, with FPC (Factory Production Control) documentation that satisfies EU notified body audits. For North American projects, ASTM A500 Grade B and C designations are available in equivalent size ranges. Steel grade selection directly affects load-bearing calculations — Q345B offers higher yield capacity than S235 for the same cross-section, which matters when engineers are optimizing weight-to-strength ratios in multi-story frames. Every batch ships with original mill test certificates traceable by heat number, and SGS or BV third-party inspection can be arranged before container sealing.
Steel Grade Selection and Galvanizing Process — What Procurement Teams Need to Know
The steel grades S235, S275, SS400, Q235B, and Q345B span both European and Chinese designation systems. S235 and Q235B are broadly equivalent in yield strength and suit general structural framing. S275 and SS400 step up for moderate load requirements, while Q345B serves as a higher-strength option for heavy-duty machinery bases and structural nodes where section size is constrained. [NEED_CITE: steel grade equivalence between EN 10219 and GB/T 6728 standards]
On the galvanizing side, hot-dip galvanizing immerses the formed ERW tube in molten zinc, producing a metallurgically bonded coating that typically exceeds 60 microns — suitable for outdoor structural work, coastal environments, and industrial atmospheres. Pre-galvanized tubes, coated from the coil before forming, offer a thinner but more uniform zinc layer at lower cost, appropriate for indoor applications like furniture frames and interior partitions. The choice between the two directly affects both service life and unit price, and our team provides side-by-side coating thickness data during quotation so buyers can match the process to the actual environment.
Wall thickness tolerance of ±1% across the full 0.8–30 mm range means that a 3 mm specified wall will measure between 2.97 mm and 3.03 mm. In an industry where some mills routinely deliver 5–8% negative tolerance, this consistency protects buyers from weight-shortage disputes and structural miscalculations at the engineering verification stage.
The Hidden Cost of Choosing the Wrong Galvanizing Process or Steel Grade
Ordering pre-galvanized tubes for an outdoor scaffolding project in a coastal zone means the zinc coating may degrade within months, triggering early replacement costs that dwarf the initial savings. Specifying S235 where Q345B is needed forces engineers to oversize sections, adding weight and connection complexity. Conversely, over-specifying high-strength grades for light-duty fencing wastes budget. [NEED_CITE: hot-dip vs pre-galvanized coating performance in corrosive environments]
Missing or incomplete mill test certificates create a different kind of cost — customs holds, project audit failures, and the inability to trace material back to the original heat. In markets with tightening import compliance, a Galvanized Square and Rectangular Steel Tube without proper EN 10219 or ASTM A500 documentation may never reach the job site, regardless of physical quality.
Why Bulk Buyers Source Galvanized SHS/RHS Through Xin Jiyuan
We operate as a direct manufacturer with no trading intermediaries, which means volume pricing scales transparently from trial orders of 1 ton up to full-container bulk shipments. Our Jinan facility runs 3 ERW production lines with monthly capacity exceeding 20,000 tons, and our warehouse holds 2,800+ standard specifications in galvanized square and rectangular profiles — enabling same-week dispatch for common sizes while custom orders complete in typical production lead times.
Every Galvanized Square and Rectangular Steel Tube leaving our mill carries original mill test certificates documenting chemical composition and mechanical properties per the declared standard. CE certification under EN 10210 and EN 10219, ISO 9001:2015 quality management, and FPC factory production control are in place for European market compliance. Third-party inspection through SGS or BV is available at any stage before container loading. Our export team handles consolidated multi-product container optimization — combining square tubes, rectangular tubes, and other steel sections into a single shipment with professional lashing and weight distribution to minimize freight cost per ton.
Documentation & Compliance
- Mill test certificate documenting S235/Q235B/Q345B chemical composition and mechanical properties per EN 10219 or GB/T 6728 for each heat number
- CE certificate covering EN 10210 and EN 10219 dimensional and tolerance compliance for European construction projects
- ISO 9001:2015 quality management system certificate covering full production and inspection process
- SGS or BV third-party inspection report available upon request, verifying wall thickness, zinc coating, and surface quality before shipment
- Material traceability by heat number linked to original mill test certificate for project audit compliance
- Full customs document package including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- Hot-dip galvanized tubes bundled with steel strips and edge protectors to preserve zinc coating integrity during ocean transit and crane handling
- Pre-galvanized tubes wrapped in woven bags with plastic end caps on both plain and beveled ends to prevent moisture ingress and edge damage
- Container loading optimized by our export team for 6 m and 12 m lengths, nesting smaller-section SHS/RHS inside larger profiles to maximize payload per 20ft or 40ft container
- Custom cut-to-length service available for 6 m and 12 m standard lengths, with dimensional reports provided for each cut batch
- Heat number and steel grade stenciled on each bundle tag for site-side traceability and inspection matching
- FOB, CIF, and DDP shipping terms available with real-time container tracking from Jinan inland depot to destination port
Ready to Lock in Pricing and Certification for Your Next SHS/RHS Order
Submit your specification sheet — section dimensions, wall thickness, steel grade, surface treatment preference, quantity, and destination port — and receive a detailed quotation with volume pricing, mill test certificate samples, and estimated container loading plan within 12 hours. For non-standard sizes outside the 20×20 to 600×600 mm range, our engineering team will confirm feasibility and production timeline.
Contact Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Mobile / WhatsApp / WeChat: +86 188 5315 7756
Email: admin@sdxinjiyuan.com
Website: www.sdxinjiyuan.com
