Description
Factory-Direct ASTM A500 GR.B Galvanized Rectangular Steel Tube Supply — Hot dipped galvanized RHS produced on 3 dedicated lines covering 15×20mm to 700×800mm, zinc coated 200–700 g/sqm, shipped with SGS inspection reports and Lloyd’s CE certification for EU and regulated markets.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 GR.B Galvanized Rectangular Steel Tube |
| Product Type | Galvanized Rectangular Steel Tube / Hot Dipped Galvanized RHS |
| Steel Grade | GR.B, S235, S275, S355, STK400 |
| Standard | ASTM A500, ASTM A53, GB/T 3091 |
| Section Shape | Rectangular (also available in Square and Round) |
| Size Range | 15mm×20mm – 700mm×800mm |
| Wall Thickness | 1 – 30 mm |
| Length | 5.8m / 6m / 11.8m / 12m / Random Length |
| Technique | ERW / Welded or Seamless |
| Surface Treatment | Hot Dipped Galvanized (Zinc Coated 200–700 g/sqm), Black Painting, Varnish, Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Processing Service | Bending, Cutting |
| Application | Construction Pipe, Building Pipe, Curtain Wall Pipe, Support Tubes, Structure Pipe, Steel Structures, Scaffolding |
| MOQ | 1 Ton |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Architectural Facades | Glass curtain wall framing, building exterior structural supports, sharp-corner RHS for clean aesthetic lines |
| Building Construction | Columns, beams, bracing members, structural frameworks for commercial and industrial buildings |
| Infrastructure & Scaffolding | Scaffolding systems, solar mounting structures, industrial platform supports, walkway frameworks |
| Steel Structure Fabrication | Raw material for fabricators producing portal frames, mezzanine floors, warehouse structures |
What Zinc Coating Thickness Costs You on a Galvanized RHS Order
Inconsistent galvanizing is the single biggest cause of batch rejection on regulated construction sites.
I have seen containers of 50×50 galvanized square tubes shipped to Saudi Arabia get rejected because the coating test came back at 45 microns when the contract specified 65 minimum. The whole lot had to be re-plated locally — shipping plus rework cost the buyer a fortune. That is why every batch of our ASTM A500 GR.B galvanized rectangular steel tube goes through our in-house lab before loading, with SGS report sealed in the container. [NEED_CITE: hot dip galvanizing coating thickness standards for structural steel]
Buyers sourcing galvanized RHS for EU projects face another layer of pain: missing or incorrect CE marks referencing EN 10210/EN 10219 block customs clearance entirely. Combined with rounded-corner aesthetics that look unfinished on architectural facades, procurement teams end up juggling multiple suppliers to solve problems that should have been resolved at the mill.
How Sharp-Corner Technology Matches Curtain Wall and Facade Requirements
Standard rectangular tubes have rounded corners (R≥2t) that create visible gaps when bolted to glass curtain wall brackets, forcing contractors to add filler plates or accept misaligned joints. Our patented sharp-corner rectangular tube technology produces true right-angle edges that sit flush against connection plates, eliminating secondary fabrication. For the ASTM A500 GR.B galvanized rectangular steel tube, this means the zinc coating covers clean 90-degree corners without the thinning that occurs on traditional rounded profiles — critical for long-term corrosion protection in coastal or industrial environments. [NEED_CITE: sharp-corner rectangular tube structural performance in architectural applications]
Engineering Compliance and Certification Requirements for Structural RHS
Structural engineers specifying ASTM A500 GR.B galvanized rectangular steel tube for load-bearing frames need documentation that matches both the steel grade and the galvanizing standard. For EU projects, Lloyd’s CE certification under EN 10210 (hot finished) or EN 10219 (cold formed) is non-negotiable — customs authorities will reject shipments lacking proper mill test certificates with chemical composition and mechanical test results. The wall thickness range of 1–30mm with ±1% tolerance covers everything from light-gauge curtain wall framing to heavy structural columns, but procurement teams must verify that the mill test certificate explicitly states compliance with the specified standard rather than generic “structural tube” descriptions. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
Steel Grade Selection and Galvanizing Process Fundamentals
The ASTM A500 GR.B grade specifies minimum yield strength for structural applications, but equivalent grades across different standards require careful cross-referencing: EN S235JR, S275JR, and S355JR represent increasing yield strength levels suitable for progressively heavier loads, while JIS STK400 serves the Japanese market specification. For the ASTM A500 GR.B galvanized rectangular steel tube, the ERW welding process produces consistent seam quality across the 15×20mm to 700×800mm size range, with hot dip galvanizing providing zinc coating of 200–700 g/sqm depending on the corrosion environment — 200g suits indoor or sheltered applications, while 400–700g is specified for outdoor exposure, coastal zones, or industrial atmospheres. The ±1% dimensional tolerance ensures that theoretical weight calculations match actual delivered weight within acceptable limits, though buyers should confirm negative tolerance policies before signing contracts.
The Hidden Cost of Wrong Steel Grade or Missing Certification
Ordering ASTM A500 GR.B galvanized rectangular steel tube without verifying mill test certificates against the actual delivered material creates three failure modes: first, chemical composition mismatches that fail third-party inspection at destination; second, missing CE documentation that blocks EU customs clearance; third, zinc coating thickness below contract specification that triggers rejection and local rework. Each scenario delays project timelines and adds costs that far exceed any initial price savings from unverified suppliers. [NEED_CITE: steel grade equivalence between ASTM and EN standards for structural applications]
Why Procurement Teams Choose SD XJY Pipe for Galvanized RHS
Our 3 production lines cover 2,800+ specifications including the full 15×20mm to 700×800mm range for ASTM A500 GR.B galvanized rectangular steel tube, with wall thickness up to 30mm available from stock or typical production lead times. The in-house physical and chemical laboratory tests every batch for dimensional accuracy, mechanical properties, and zinc coating thickness before shipment — no batch leaves without an SGS or BV inspection report available. Our 41 invention patents include China’s first sharp-corner rectangular tube technology, filling the gap for architectural applications that require true right-angle aesthetics. Full international certifications — ISO 9001:2015, Lloyd’s CE (EN 10210/EN 10219), Singapore FPC — ensure customs clearance for EU, North American, and regulated Asian markets. Custom non-standard sizes, cutting, and professional container loading with anti-damage measures are standard, not optional extras.
Documentation & Compliance
- Mill test certificate documenting GR.B chemical composition and mechanical properties per ASTM A500, including yield strength, tensile strength, and elongation results
- Lloyd’s CE certificate referencing EN 10210 or EN 10219 for EU market compliance, valid for the specific heat number and production batch
- ISO 9001:2015 quality management system certificate covering the complete production process from raw material inspection to final galvanizing
- SGS or BV third-party inspection report verifying dimensional tolerance, zinc coating thickness (200–700 g/sqm), and surface quality before container sealing
- Material traceability by heat number linking each ASTM A500 GR.B galvanized rectangular steel tube to its production batch and test results
- Complete customs documentation including packing list, bill of lading, and certificate of origin for destination country clearance
Packaging, Loading & Delivery
- ASTM A500 GR.B galvanized rectangular steel tubes bundled with steel strips and edge protectors to preserve the zinc coating during ocean transit and prevent corner damage
- Hot dip galvanized surface protected with anti-rust oil or passivation treatment before bundling, suitable for 6m and 12m lengths in standard 20ft and 40ft containers
- Container loading optimized for 15×20mm to 700×800mm size range, with smaller sections nested to maximize payload and heavy-wall tubes secured to prevent shifting
- Custom cutting to site-specific lengths available, reducing on-site waste and handling for curtain wall and scaffolding applications
- Heat number and steel grade marked on each tube end for traceability, with bundle tags showing specification, quantity, and destination
- FOB, CIF, and DDP shipping terms available, with professional loading supervision and tracking until arrival at destination port or site
How to Request a Quotation for ASTM A500 GR.B Galvanized RHS
Submit your specification sheet including section dimensions, wall thickness, length, steel grade (GR.B/S235/S355/STK400), zinc coating requirement (200–700 g/sqm), quantity, and destination port. We respond within 12 hours with unit pricing, mill test certificate samples, and SGS inspection confirmation. For custom non-standard sizes or sharp-corner requirements, our engineering team provides technical drawings and production feasibility confirmation before contract signing.
Frequently Asked Questions
Q: What is the difference between 200g, 400g, and 700g zinc coating, and which should I specify?
A: The zinc coating weight (grams per square meter) determines corrosion protection level. 200g/sqm suits indoor or sheltered applications with minimal moisture exposure. 400g/sqm is standard for outdoor structural use in moderate environments. 700g/sqm is specified for coastal zones, industrial atmospheres, or projects requiring extended service life without maintenance. Our in-house lab measures coating thickness on every batch to verify compliance with your specification.
Q: Can you provide ASTM A500 GR.B and EN S355JR equivalent grades in the same order?
A: Yes. We produce ASTM A500 GR.B, EN S235JR/S275JR/S355JR, and JIS STK400 on the same production lines with full chemical composition and mechanical testing for each grade. Mill test certificates clearly identify the standard and grade for each heat number, ensuring traceability and compliance with your project specification.
Q: Do you ship ASTM A500 GR.B galvanized rectangular steel tube with CE certification for EU projects?
A: Yes. Our Lloyd’s CE certification covers EN 10210 (hot finished) and EN 10219 (cold formed) hollow sections. Each shipment includes mill test certificates, CE documentation, and third-party inspection reports (SGS/BV) as standard. We have exported to EU countries for over a decade with zero customs rejection due to documentation issues.
Q: What is the minimum order quantity for custom non-standard sizes?
A: Standard sizes (15×20mm to 700×800mm, wall thickness 1–30mm) are available from stock with 1 ton MOQ. Custom non-standard sizes or special lengths require production runs with typical MOQ of 5–10 tons depending on specification complexity. Contact us with your drawing or specification for exact MOQ and lead time confirmation.
Q: How do you ensure zinc coating thickness meets contract requirements?
A: Every batch of ASTM A500 GR.B galvanized rectangular steel tube undergoes coating thickness testing in our in-house laboratory using magnetic induction gauges per ISO 1460 or ASTM A123 standards. Results are documented in the mill test certificate and verified by SGS or BV third-party inspection before container sealing. If coating thickness falls below your specification, the batch is re-galvanized at our cost before shipment.
Get Your ASTM A500 GR.B Galvanized Rectangular Steel Tube Quote with Mill Test Certificate
Send your specification including dimensions, steel grade, zinc coating requirement, quantity, and destination to receive pricing, SGS inspection confirmation, and CE documentation details within 12 hours.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
Website: www.sdxjypipe.com
