Description
Direct Mill Supply, Zero Middleman Markup — Every Q235 and S275JR galvanized SHS/RHS rolls out of our Jinan facility with mill test certificates traceable to heat number, shipped FOB or CIF to 50+ countries without a single trading desk in between.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Galvanized Square and Rectangular Steel Tube (SHS/RHS) |
| Steel Grade | Q195, Q235, Q235B, Q355, S275, S275JR, A53, ST37, SGCC, CGCC, DX51D |
| Standard | ASTM, JIS, GB (Q-series), EN (S-series) |
| Section Shape | Square / Rectangular |
| Size Range | 15×15 mm – 1000×1000 mm |
| Wall Thickness | 1.2 – 20 mm |
| Length | 1 – 12 m (or as requested) |
| Technique | Hot Rolled Based / ERW |
| Surface Treatment | Hot Dipped Galvanized / Pre-Galvanized (Z30 – Z180 coating) |
| Tolerance | ±1% |
| Spangle Type | Zero Spangle |
| Hardness | Full Hard |
| Skin Pass | Yes |
| Oiled or Non-oiled | Non-oiled |
| Processing Service | Bending, Cutting, Decoiling, Punching, Welding |
| Application | Steel structures, Construction frames, Scaffolding, Fencing, Greenhouse, Machinery frames, Making pipes, Making small tools, Boiler pipe |
| MOQ | 15 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, column bracing, roof trusses for commercial and industrial structures |
| Scaffolding & Access | Scaffold tube systems, temporary access towers, edge protection uprights |
| Agricultural Structures | Greenhouse framing, livestock shelter posts, irrigation support rails |
| Machinery & Equipment | Conveyor frames, machine guards, equipment base structures |
| Fencing & Security | Perimeter fencing posts, barrier rails, gate frames |
What Zinc Coating Uniformity Costs on a Galvanized SHS/RHS Order
Corner coating thickness decides whether your galvanized tubes pass inspection or get rejected at the port.
I once held an entire container of hot-dipped galvanized rectangular hollow sections because the zinc layer read 45 microns on the flat faces but barely touched 30 on the sharp corners — the dip line had short-coated the edges. The mill cert looked perfect; the actual product did not match. For a Hot Dipped Galvanized Square and Rectangular Steel Tube Supplier running export orders to regulated markets, that kind of inconsistency triggers rejection at destination, re-galvanizing costs, or outright structural rejection by the site engineer. [NEED_CITE: EN 10219 cold-formed hollow section dimensional and coating requirements] Most buyers discover the problem only after the container arrives, when the corner zinc has already started peeling during unloading.
Matching Galvanized SHS/RHS to Structural and Corrosive Environments
A Hot Dipped Galvanized Square and Rectangular Steel Tube Supplier serving facade contractors and EPC firms must deliver tubes that hold up in both load-bearing and corrosive conditions. Our Q235 and Q355 grades carry the structural strength for building frames and scaffolding, while the hot-dipped zinc coating (Z30–Z180) provides corrosion resistance for outdoor and humid environments — greenhouses, coastal fencing, industrial machinery bases. The zero spangle finish ensures a uniform surface that accepts powder coating or paint without visible pattern bleed-through, which matters when the tubes remain exposed in architectural applications.
Engineering Compliance and Certification Requirements
Structural hollow sections used in EU-regulated projects must conform to EN 10219 dimensional tolerances and carry CE marking under the Construction Products Regulation. [NEED_CITE: EN 10219 cold-formed hollow section certification for EU construction market] For North American imports, ASTM A53 and A500 grade compliance determines whether the tubes clear customs and pass third-party inspection. Our in-house physical and chemical laboratory tests every batch for dimensional accuracy, mechanical properties, and coating adhesion before shipment. The ±1% tolerance on wall thickness ensures that theoretical weight calculations match actual delivered weight — a detail that prevents disputes on large-volume orders where even small deviations compound into tons of discrepancy. [NEED_CITE: steel grade equivalence between EN S-series and GB Q-series standards]
Steel Grade Selection and Galvanizing Process Explained
Q235 and Q355 dominate the Chinese domestic market for structural tubes, offering yield strength steps that align with S275JR and S355JR in the EN system respectively. When a project spec calls for S275JR, sourcing Q235B as a substitute without engineer approval creates compliance risk — the yield strength gap matters in load calculations for scaffolding and heavy machinery frames. Hot-dipped galvanizing immerses the formed tube in molten zinc, producing a metallurgical bond that outperforms pre-galvanized (electro-galvanized) coating in corrosion resistance and adhesion. Pre-galvanized tubes (Z30–Z180) suit indoor or mild environments where cost matters more than longevity. The zero spangle finish on our hot-dipped tubes eliminates the visible crystalline pattern typical of standard galvanized products, delivering a smooth matte surface preferred for visible architectural installations. Wall thickness from 1.2 mm to 20 mm covers everything from light-duty greenhouse framing to heavy structural columns, with the ERW welding process ensuring consistent seam quality across the full range.
Hidden Costs of Sourcing the Wrong Galvanized SHS/RHS
Ordering pre-galvanized tubes when the spec requires hot-dipped coating leads to premature corrosion failure in outdoor applications — the zinc layer is thinner, less adherent, and fails to protect weld zones and cut edges. Substituting Q195 for Q355 to save cost per ton reduces load-bearing capacity, forcing the structural engineer to redesign or reject the entire batch. Missing CE documentation on an EU-bound shipment means customs holds the container, triggering demurrage charges and project delays that dwarf the original material savings. [NEED_CITE: consequences of non-compliant steel imports in EU construction market] Every one of these failures traces back to a sourcing decision made at the inquiry stage — before the mill test certificate was requested, before the coating thickness was verified, before the container was loaded.
Why Project Procurement Teams Source from Xin Jiyuan
We operate three production lines covering 2,800+ specifications, so a single inquiry for galvanized SHS, RHS, and matching section steel gets fulfilled from one facility — no broker juggling multiple mills. Our 41 invention patents include China’s first sharp-corner rectangular tube technology, filling a gap for facade contractors who need true 90-degree corners that standard rounded-corner tubes cannot provide. Every shipment leaves with a mill test certificate generated by our in-house laboratory, verified by SGS or BV third-party inspection on request, and backed by ISO 9001:2015 and Lloyd’s CE certification for EN 10219/10210 compliance. Custom non-standard sizes and lengths are produced to order with low MOQ, and our professional container loading team uses anti-damage measures to prevent bending and zinc coating scratches during ocean transit. We have exported to 50+ countries, so we understand the documentation, marking, and packing requirements that keep shipments moving through customs at destination.
Documentation & Compliance
- Mill test certificate documenting Q235B chemical composition and yield strength per GB/T 6728, with heat number traceability
- CE certificate confirming EN 10219 compliance for S275JR and S355JR structural hollow sections exported to EU markets
- ISO 9001:2015 quality management certificate covering the full galvanizing and tube forming process
- SGS or BV third-party inspection report verifying zinc coating thickness (Z30–Z180) and dimensional tolerance before shipment
- Material traceability by heat number stamped on each tube, matching the mill test certificate
- Full customs documentation: packing list, bill of lading, certificate of origin, and commercial invoice
Packaging, Loading & Delivery
- Galvanized SHS/RHS bundled with steel strips and edge protectors to preserve the zero spangle zinc coating during ocean transit
- Hot-dipped galvanized tubes wrapped in waterproof paper at cut ends to prevent white rust formation on exposed steel
- Container loading optimized for 6 m and 12 m lengths, with wooden chocks and separation layers preventing tube-to-tube abrasion
- Custom cut-to-length service available for 1–12 m requirements, with burr-free ends ready for welding or mechanical connection
- Heat number and steel grade marked on each tube at 1 m intervals, visible after bundling for site identification
- FOB, CIF, and DDP shipping terms available from Jinan port, with full export documentation and tracking until arrival
Getting Your Galvanized SHS/RHS Quote Started
Send your specification sheet with section dimensions, wall thickness, steel grade, coating type (hot-dipped or pre-galvanized), quantity, and destination port. We respond within 12 hours with unit pricing, lead time, and available mill test certificate samples. For non-standard sizes or sharp-corner rectangular tubes, we provide custom fabrication drawings before production begins.
Request Your Hot Dipped Galvanized SHS/RHS Quote
Submit your dimensions, steel grade, and quantity to receive pricing and mill test certificate samples within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
Frequently Asked Questions
Q: What is the difference between hot-dipped galvanized and pre-galvanized SHS/RHS?
A: Hot-dipped galvanizing immerses the formed tube in molten zinc, creating a metallurgical bond with coating thickness typically 60–180 microns, suitable for outdoor and corrosive environments. Pre-galvanized tubes are made from pre-coated steel coil with thinner zinc layers (Z30–Z180), more cost-effective for indoor or mild conditions.
Q: Can you supply galvanized SHS/RHS with CE certification for EU projects?
A: Yes. Our galvanized square and rectangular tubes carry Lloyd’s CE certification under EN 10219/EN 10210, with full mill test certificates and third-party inspection (SGS/BV) available before shipment.
Q: What steel grades are available for galvanized SHS/RHS?
A: We supply Q195, Q235, Q235B, Q355 in the GB system; S275, S275JR in the EN system; A53, ST37 in ASTM/JIS; and SGCC, CGCC, DX51D for commercial quality galvanized tubes.
Q: What is the minimum order quantity for galvanized SHS/RHS?
A: The MOQ is 15 tons per order. For standard sizes, we ship from stock. Custom non-standard dimensions and lengths enter production with typical lead times of 15–25 days.
Q: Do you offer processing services like cutting and punching?
A: Yes. We provide bending, cutting, decoiling, punching, and welding services, delivering fabrication-ready galvanized tubes to reduce on-site labor and waste.
