Description
Factory-direct A36 GI RHS — Vertically integrated from raw steel plate to galvanized rectangular tubes, eliminating third-party material gaps.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | A36 GI Rectangular Steel Pipe |
| Product Type | Rectangular Steel Tube (RHS) |
| Steel Grade | A36, Gr.B, Q195-Q345, S235, S275, S355, STK400 |
| Standard | ASTM A500, ASTM A53, GB/T 3091, EN10219, EN10210 |
| Section Shape | Rectangular |
| 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-dip Galvanized / Black Painting / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Steel structures, construction frames, curtain wall, building pipe, support tubes, machinery, scaffolding |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Commercial Construction | Building frames, warehouse portal frames, logistics center columns |
| Industrial Infrastructure | Machinery support frames, conveyor structures, industrial platforms |
| Architectural Facades | Curtain wall mullions, decorative structural supports |
| Scaffolding & Formwork | Scaffold ledger tubes, shoring props, access platforms |
| Belt & Road Projects | Bridge support tubes, port facility frames, power plant structures |
Why Galvanized Coating Thickness Decides Site Acceptance on A36 GI Rectangular Steel Pipe Orders
A 20-micron gap between contract spec and actual coating can trigger full-container rejection at destination port.
When project engineers specify hot-dip galvanized rectangular hollow sections for outdoor structural frames, the coating thickness directly determines corrosion resistance lifespan and inspection pass rates. Buyers sourcing A36 GI rectangular steel pipe from overseas fabricators frequently discover coating inconsistencies only after third-party inspection at the discharge port — by then, re-galvanizing means demurrage charges, project delays, and strained contractor relationships. Material traceability gaps compound the problem: when the fabricator sources raw tubes from third-party mills without heat-number documentation, proving coating compliance becomes impossible. [NEED_CITE: hot-dip galvanized coating thickness requirements per ASTM A123]
How A36 GI Rectangular Steel Pipe Matches Structural Frame Engineering Requirements
For warehouse portal frames and logistics center columns, the 200×100mm RHS section delivers optimal section modulus-to-weight ratio while the A36 grade provides reliable weldability under AWS D1.1 procedures. The hot-dip galvanized coating protects cut edges and weld zones after on-site modification, eliminating the need for touch-up painting that often fails within the first weathering season. Our vertically integrated production line processes raw steel plate through forming, welding, and galvanizing under one quality management system — the same laboratory that certifies the base metal also verifies coating adhesion and thickness before shipment.
Engineering Compliance and Certification Pathways for A36 GI Rectangular Steel Pipe
Structural frames designed to EN 1993 require hollow sections manufactured per EN10219 (cold-formed) or EN10210 (hot-formed), with CE marking mandatory for EU project customs clearance. The A36 GI rectangular steel pipe we supply meets ASTM A500 Grade B for North American projects while the S235/S355 equivalents serve European and Middle East specifications under the same production quality system. For projects in Saudi Arabia or UAE, third-party inspection through SGS or BV confirms both dimensional tolerance and galvanized coating thickness against project-specific corrosion protection schedules. [NEED_CITE: EN 10219 cold-formed structural hollow section dimensional tolerances]
Steel Grade Selection and Galvanizing Process Fundamentals
The A36 grade (ASTM A500) and S235 (EN10219) represent equivalent minimum yield strength tiers suitable for general structural framing, while S355 provides higher load-bearing capacity for heavy industrial platforms without increasing section dimensions. The ERW welding process produces a continuous longitudinal seam that, after galvanizing, receives full zinc coverage including the weld zone — critical for preventing seam-line corrosion in humid coastal environments. Hot-dip galvanizing at controlled bath temperature and immersion duration ensures coating thickness uniformity across flat surfaces and corner radii, with typical results exceeding 65 microns for structural sections above 6mm wall thickness. The ±1% dimensional tolerance on the A36 GI rectangular steel pipe ensures connection plate fit-up without forcing, reducing on-site rework for bolted and welded joints.
Hidden Costs of Non-Compliant A36 GI Rectangular Steel Pipe Procurement
Specifying A36 grade while accepting Q195 substitution reduces yield strength below structural calculation assumptions, potentially triggering engineer-of-record rejection and redesign costs. Missing mill test certificates or untraceable heat numbers create compliance gaps that fail third-party inspection, delaying customs clearance and incurring port storage fees. Undersized galvanized coating thickness accelerates white rust formation during ocean transit, requiring costly re-surface treatment before installation. [NEED_CITE: material substitution risks in structural steel procurement]
Procurement Confidence from Vertically Integrated Production
Our own steel mill with three production lines and over 2,800 raw material specifications means every A36 GI rectangular steel pipe starts from traceable plate or coil stock, not purchased merchant tubes. The in-house metallurgical laboratory issues mill test certificates documenting chemical composition and mechanical properties for every heat number, while dedicated galvanizing line operators measure coating thickness and adhesion before bundling. Third-party inspection agencies including SGS, BV, and TÜV conduct pre-shipment verification at our facility, providing independent confirmation for project owners and main contractors. Custom non-standard sizes and cut-to-length services accommodate specific engineering drawings without minimum order penalties beyond the standard 5-ton threshold. Professional export packing with edge protectors preserves galvanized coating integrity during ocean transit, while complete documentation packages satisfy customs requirements across EU, Middle East, and Southeast Asian ports.
Documentation & Compliance
- Mill test certificate documenting A36 chemical composition and mechanical properties per ASTM A500, traceable by heat number
- CE certificate confirming EN10219 compliance for cold-formed structural hollow sections entering EU markets
- ISO 9001 quality management certificate covering the integrated steel production and fabrication process
- SGS or BV third-party inspection report verifying galvanized coating thickness and dimensional tolerance
- Material traceability documentation linking each A36 GI rectangular steel pipe bundle to specific heat numbers and production dates
- Complete customs documents including packing list, bill of lading, and certificate of origin for destination port clearance
Packaging, Loading & Delivery
- Hot-dip galvanized A36 GI rectangular steel pipe bundled with steel strips and edge protectors to prevent zinc coating damage during handling and transit
- Surface protection extended with anti-rust oil application for bare or black painted tubes, while galvanized bundles receive waterproof wrapping for ocean shipment
- Container loading optimized for 6m and 12m lengths in 20ft and 40ft open-top containers, maximizing weight utilization within shipping limits
- Cut-to-length services available for random length requirements, with precise dimensional control matching project-specific fabrication schedules
- Bundle identification marks displaying steel grade A36, heat number, size designation, and production batch for site receiving verification
- Delivery terms available as FOB, CIF, or DDP with professional loading supervision and complete export documentation support
Request Quotation with Mill Test Certificate for Your A36 GI Rectangular Steel Pipe Project
Submit your project specifications including section dimensions, wall thickness, steel grade, surface treatment requirement, and destination port to receive detailed pricing with complete mill test certificate documentation. Our engineering team reviews shop drawings for material optimization and provides fabrication sequencing support for complex structural assemblies.
Contact for Technical Quotation
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
Frequently Asked Questions
Q: What is the difference between A36, S235, and Q235 steel grades for rectangular tubes?
A: These grades represent equivalent minimum yield strength levels across different standard systems — A36 follows ASTM standards for North American projects, S235 complies with EN10219 for European specifications, and Q235 meets GB/T 3091 for domestic Chinese applications. All three provide similar structural performance for general framing applications, with selection typically driven by project specification requirements and local engineering approval preferences.
Q: How do you ensure galvanized coating thickness meets project specifications?
A: Our dedicated galvanizing line controls bath temperature, immersion duration, and withdrawal speed to achieve consistent coating thickness across all surfaces. Every production batch receives thickness measurement using calibrated coating gauges, with results documented in the mill test certificate package. Third-party inspection agencies can verify coating compliance during pre-shipment inspection at our facility.
Q: Can you produce non-standard rectangular tube dimensions with small quantities?
A: Our vertically integrated production capability covers sizes from 15mm×20mm to 700mm×800mm with wall thickness from 1 to 30mm. While standard sizes maintain the 5-ton minimum order quantity, custom non-standard dimensions and special cut lengths are available with flexible MOQ arrangements depending on specific requirements.
Q: What surface treatment options are available besides hot-dip galvanizing?
A: We offer hot-dip galvanized coating for maximum corrosion protection in outdoor and humid environments, black painting for indoor applications or subsequent field coating, varnish treatment for temporary protection during transit, and bare (uncoated) condition for projects requiring field-applied coating systems. Selection depends on project environment, design life expectations, and local coating application capabilities.
Q: What documentation do you provide for customs clearance and project compliance?
A: Every shipment includes mill test certificates with chemical composition and mechanical properties, CE marking certificates for EU destinations, ISO 9001 quality certificates, packing lists, bills of lading, and certificates of origin. Third-party inspection reports from SGS, BV, or TÜV are available upon request to satisfy project owner verification requirements.
Secure Your A36 GI Rectangular Steel Pipe Supply with Verified Quality Documentation
Send your project drawings and specifications to receive competitive pricing with complete mill test certificates and third-party inspection options within 24 hours.
