Square & Rectangular Steel Tubes
Carbon-steel hollow sections for structural frames, fabrication, machinery, fencing, solar supports and general engineering. Supply is reviewed against the required grade, dimensions, tolerance, surface and destination port.
REQUEST FOB / CFR / CIF QUOTEVIEW SPECIFICATIONS
Hollow Sections Matched to the Fabrication Requirement
Square hollow sections (SHS) and rectangular hollow sections (RHS) combine closed-section geometry with convenient cutting and welding. They are commonly selected where clean lines, torsional resistance and straightforward fabrication are important.
FCB STEEL reviews the purchase specification before quotation. Grade equivalence, wall thickness, corner radius, dimensional tolerance and surface condition should be confirmed rather than assumed.
Supply Specification Guide
The ranges below are product-family guidance. The final quotation and order confirmation control the exact dimensions, tolerances and test requirements.
| Product forms | Square Hollow Section (SHS) and Rectangular Hollow Section (RHS) |
|---|---|
| Catalog grade | Q235 / Q345 |
| Common inquiry standards | EN 10210; ASTM A500, EN 10219, JIS G3466 and GB/T 6728 subject to order review |
| SHS size guide | 20 × 20 mm to 500 × 500 mm |
| RHS size guide | 50 × 30 mm to 600 × 400 mm |
| Wall thickness | Manufactured to the confirmed size and purchase specification; state the required thickness in the inquiry |
| Length | 6 m catalog reference; fixed or project lengths subject to production review |
| Surface | Black, oiled, hot-dip galvanized, pre-galvanized or painted, as confirmed |
| Processing | Fixed-length cutting, drilling, punching, welding, coating and custom marking, where applicable |
| Quotation unit | Metric ton or piece, depending on confirmed dimensions and quantity |
How to Describe the Tube You Need
Use outside dimensions and wall thickness
For an accurate offer, identify the section in a format such as 100 × 100 × 4 mm or 150 × 100 × 5 mm, followed by the required length.
- A / B: outside side dimensions
- t: nominal wall thickness
- L: required fixed or random length
- Finish: black, galvanized, painted or specified coating
Section mass and quantity should be calculated from the confirmed standard and actual ordered dimensions.
Prepared for Fabrication and Export
Processing scope is quoted against drawings and inspection requirements.
Fixed-Length Cutting
Cut lengths, end condition and dimensional tolerance are confirmed before production.
Drilling, Punching & Welding
Secondary processing can be reviewed from approved drawings and quantities.
Galvanized or Coated Finish
Surface system and coating requirements are stated in the confirmed order.
Where Square and Rectangular Tubes Are Used
Section selection depends on design load, span, connection detail, corrosion exposure and local engineering requirements.
Solar Support Structures
Frames and secondary supports for solar carports and renewable-energy installations.
Greenhouses & Agriculture
Galvanized frames for commercial growing facilities and agricultural structures.
Warehouse Racking
Frames, braces and fabricated components for storage and material handling.
Sign & Support Frames
Fabricated frames where straight geometry and repeatable connections are required.
Fencing & Guardrails
Posts, rails, gates and protective barriers with suitable corrosion protection.
General Fabrication
Machine frames, work platforms, furniture and fabricated industrial assemblies.
Experience Supporting Industrial Steel Requirements
These anonymized references come from internal performance records. They show relevant coordination experience but do not claim that every material in the project was square or rectangular tube.
Solar Manufacturing Facility
Steel package coordination for an industrial renewable-energy production project.
- Scope
- Pipes, fittings and supporting steel
- Support
- Specification matching and staged delivery
Overseas Assembly Workshop
Material support for an overseas production-facility requirement.
- Scope
- Tubes, fittings and structural steel
- Support
- Export packing and shipment documents
Mixed Steel Package Supply
Consolidated purchasing support across several carbon, galvanized and stainless categories.
- Scope
- Multiple steel product families
- Support
- Consolidation and export preparation
Checks Planned Around the Purchase Specification
Inspection scope is agreed with the order and can include visual, dimensional and document review.
Weld & Surface Check
Visual condition and weld appearance reviewed as specified.
Dimensional Check
Outside size, wall thickness, length and tolerance checks.
Export Packing
Bundling, end protection, wrapping and shipping marks by order.
Container Loading
Loading coordination and photo records where agreed.
Order and Shipment Document Support
Before Requesting a Quotation
What information is required for an accurate quote?
Send SHS or RHS, outside dimensions, wall thickness, grade or standard, length, quantity, surface treatment and destination port. Drawings are recommended for processed parts.
Can non-standard sizes and fixed lengths be supplied?
They can be reviewed. Availability depends on dimension, wall thickness, quantity, mill capability and tolerance. The confirmed quotation states the accepted specification.
Which standards and grades are available?
The catalog data supports Q235/Q345 and EN 10210. ASTM A500, EN 10219, JIS G3466, GB/T 6728 and other grades can be reviewed against the exact inquiry; no substitution is made without approval.
Can galvanized square tubes be supplied?
Yes, subject to size and order review. State whether pre-galvanized or hot-dip galvanized material is required and provide any coating requirement.
Can third-party inspection be arranged?
Yes. SGS, Bureau Veritas, TUV or another agreed inspection company can be arranged at the buyer’s request, with scope and cost confirmed before order.
Do you publish a fixed steel price?
No. Steel and ocean-freight costs change frequently. We prepare a current FOB, CFR or CIF offer after confirming specification, quantity, destination port, delivery period and quotation validity.
Get the Current Price for Your Specification
SHS / RHS · Outside Size · Wall Thickness · Length · Quantity · Destination Port