Description
Factory-Direct A36 GI RHS Pricing — Every A36 GI Rectangular Steel Tube we ship leaves our own mill, eliminating trading margins and keeping your project budget intact.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | A36 GI Rectangular Steel Tube |
| Product Type | Welded Rectangular Steel Tube (RHS) |
| Steel Grade | A36, Gr.B, S235, S275, S355, STK400, Q195, Q235, Q345 |
| Standard | ASTM A500, ASTM A53, GB/T 3091, EN 10219, EN 10210 |
| Section Shape | Rectangular |
| Size Range | 15mm×20mm – 700mm×800mm |
| Wall Thickness | 1 – 30 mm |
| Length | 5.8m / 6m / 11.8m / 12m / DRL / SRL / Random Length |
| Technique | Welded (ERW) / Seamless |
| Surface Treatment | Black Painting / Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Steel structures / Construction frames / Curtain wall / Building pipe / Support tubes / Fertilizer tube |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors | Industrial plant steel frames, pipe rack supports, equipment skid bases |
| Construction Companies | Curtain wall mullions, building column sleeves, mezzanine support tubes |
| Machinery Manufacturers | Conveyor system frames, hydraulic cylinder housings, machine base structures |
| Infrastructure Developers | Highway sound barrier posts, solar panel mounting structures, bridge handrail uprights |
What Zinc Coating Uncertainty Costs on a Galvanized RHS Order
A rejected container at the destination port costs far more than the price difference between a reliable mill and a questionable supplier.
Global EPC contractors routinely face coating weight disputes when galvanized rectangular tubes arrive on site. The SGS inspector measures 42 microns against a 65-micron spec, and the entire shipment gets flagged. You cannot eyeball galvanizing thickness, and visual inspection alone will not catch under-coated batches before they leave China. That is why every A36 GI Rectangular Steel Tube we produce runs through our in-house physical and chemical laboratory for coating weight verification before loading. [NEED_CITE: hot-dip galvanized coating thickness testing standards per ASTM A123]
Matching Structural Load Requirements Across Frame Systems
A36 GI Rectangular Steel Tube in wall thicknesses from 1 mm to 30 mm covers both light-gauge curtain wall supports and heavy-load column members within a single procurement cycle. The rectangular cross-section provides flat bearing surfaces for bolted connections and welded joints, reducing the need for additional gusset plates on steel frames. Our ERW welding process maintains weld seam integrity across the full 15mm×20mm to 700mm×800mm size range, and the ±1% dimensional tolerance ensures that prefabricated frame assemblies fit together without on-site rework.
Engineering Compliance and Certification Pathways
Structural engineers specifying A36 GI Rectangular Steel Tube for EU projects need CE marking under EN 10219 or EN 10210 to clear customs and satisfy building inspectors. For North American destinations, ASTM A500 Grade B or Grade C certification aligns with AISC design manuals. Our mill holds Lloyd’s Register EU CE certification for cold-formed hollow sections, and we provide original Mill Test Certificates traceable to each heat number. [NEED_CITE: EN 10219 cold-formed structural hollow sections compliance requirements] When your project demands third-party verification, we arrange SGS or BV inspection at our facility before shipment, so the inspection report travels with the cargo.
Steel Grade Selection and Welding Process Fundamentals
A36, Gr.B, S235, S275, and S355 represent different strength tiers across ASTM, JIS, and EN systems — A36 and Gr.B share similar yield characteristics for general structural use, while S355 delivers higher yield strength for heavy-load applications. Our ERW welded process forms the rectangular profile from coil, then passes the weld seam through induction heating and pressure rolls to fuse the joint. The weld zone undergoes the same galvanizing treatment as the base metal, ensuring uniform corrosion protection across the entire tube surface. Hot-dip galvanizing deposits a zinc-iron alloy layer that bonds metallurgically to the steel substrate, providing sacrificial protection even if the coating gets scratched during handling or installation.
Hidden Costs of Unverified Material and Missing Documentation
Ordering A36 GI Rectangular Steel Tube without verified Mill Test Certificates creates downstream risks: customs authorities may detain the shipment if CE documentation is incomplete, site inspectors may reject tubes that fail coating thickness tests, and structural engineers may refuse to sign off on frames built from untraceable material. The cost of re-shipping a rejected container or fabricating replacement tubes on an accelerated timeline dwarfs the initial savings from choosing an unverified supplier. [NEED_CITE: steel import customs documentation requirements for CE marked structural hollow sections]
Why Procurement Teams Source A36 GI Rectangular Steel Tube From Our Mill
We operate three dedicated production lines covering over 2,800 specifications, so your A36 GI Rectangular Steel Tube order ships from our own inventory rather than a broker’s warehouse. Our in-house physical and chemical laboratory tests every heat for chemical composition, tensile properties, and coating weight before release — you receive the Mill Test Certificate with your shipping documents, not as an afterthought. We hold 41 invention patents including proprietary sharp-corner rectangular tube technology, and our CE certification under EN 10210/EN 10219 covers EU project compliance. For custom non-standard sizes outside our standard catalog, we manufacture to your drawings with the same quality controls applied to catalog items. Our logistics team optimizes container loading plans for your specific size mix and handles FOB, CIF, or DDP terms with real-time tracking.
Documentation & Compliance
- Mill Test Certificate documenting A36 chemical composition and mechanical properties per ASTM A500, traceable to heat number
- CE certificate confirming EN 10219 compliance for cold-formed structural hollow sections destined for EU markets
- ISO 9001:2015 quality management system certificate covering our full production and inspection process
- SGS or BV third-party inspection report for coating weight, dimensional tolerance, and visual quality verification
- Material traceability sheet linking each bundle to its heat number, production date, and test results
- Customs documentation package including packing list, Bill of Lading, and Certificate of Origin
Packaging, Loading & Delivery
- Galvanized A36 GI Rectangular Steel Tube bundled with steel strips and edge protectors to preserve the zinc coating during ocean transit
- Black painted or varnished tubes wrapped in waterproof cloth to prevent surface damage and moisture ingress during storage and shipping
- Container loading plans optimized for your size mix — 6m and 11.8m lengths configured for maximum 20ft or 40ft container utilization
- Random length or cut-to-length options available, with plain ends deburred and ready for welding or threading upon arrival
- Each bundle marked with heat number, steel grade A36, size dimensions, and our mill identification for site traceability
- FOB, CIF, or DDP shipping terms with professional port coordination and door-to-door logistics to 50+ countries
How to Request a Quotation for Your A36 GI Rectangular Steel Tube Order
Send your specification sheet including size, wall thickness, steel grade, surface treatment, quantity, and destination port — we respond within 12 hours with unit pricing, production lead time, and applicable certification details. If your project requires non-standard dimensions or custom lengths outside our 2,800+ catalog models, share your drawings and we will confirm feasibility and MOQ. We can arrange SGS or BV third-party inspection before shipment and provide complete customs documentation for smooth clearance at your destination port.
Frequently Asked Questions
Q: How does A36 compare to S235JR, Q235B, and STK400 in terms of equivalence?
A: A36 (ASTM), S235JR (EN), Q235B (GB), and STK400 (JIS) share similar yield strength ranges for general structural applications, but chemical composition limits and testing requirements differ by standard. We supply all four grades from the same production lines and can provide Mill Test Certificates confirming compliance with your specified standard.
Q: Can you provide Mill Test Certificates and arrange third-party inspection?
A: Yes. Every A36 GI Rectangular Steel Tube shipment includes an original Mill Test Certificate documenting chemical composition and mechanical properties per heat number. We also arrange SGS or BV third-party inspection at our facility before loading, with the inspection report included in your shipping documents.
Q: What is the MOQ for custom rectangular tubes outside your standard catalog?
A: Our standard MOQ is 5 Tons for catalog items. For custom non-standard sizes or special lengths, MOQ depends on the specific dimensions and production setup required — share your requirements and we will confirm the exact quantity and lead time.
Q: When should I specify hot-dip galvanized versus black painted or bare finish?
A: Hot-dip galvanized finish is recommended for outdoor exposure, high-humidity environments, or applications where maintenance access is limited. Black painting or varnish provides temporary protection during storage and transit, while bare finish suits indoor applications or projects where you will apply your own coating system on site.
Q: Do you handle logistics and provide full customs documentation?
A: Yes. We offer FOB, CIF, and DDP shipping terms with professional container loading optimization. Your shipment includes Mill Test Certificates, packing list, Bill of Lading, and Certificate of Origin — all documents needed for customs clearance at your destination port.
Get Your A36 GI Rectangular Steel Tube Quote Today
Submit your size, quantity, and destination port details via email or WhatsApp, and receive pricing with Mill Test Certificate confirmation within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjysteel.com
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
