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ASTM A500 Grade B/C Square Tube | Premium Structural Steel Tubing for North American Construction
ASTM A500 Grade B and Grade C square tubes are high-strength structural hollow sections, engineered to handle tough construction, fabrication and industrial projects in the North American market. Fabricated to ASTM A500 specifications, these SHS deliver solid mechanical strength, good weldability, precise dimensions and lasting durability.
Preferred by contractors, design engineers, steel fabricators and metal distributors, ASTM A500 square tubes work well for structural frames, building supports, equipment bases, bridge components, farm structures and general metal fabrication work.
Royal Steel Group stocks ASTM A500 Grade B & C square tubes across a full range of sizes, wall thicknesses and cut lengths. We deliver dependable steel solutions for commercial building and industrial projects globally.
| Item | Description |
| Product Name | ASTM A500 Grade B/C Square Tube |
| Type | Square Hollow Section (SHS) |
| Standard | ASTM A500/A500M |
| Grades | Grade B, Grade C |
| Manufacturing Process | ERW Welded Steel Tube |
| Surface | Black, Galvanized, Painted |
| Shape | Square |
| Length | 20 ft, 40 ft or Customized |
| Processing | Cutting, Drilling, Fabrication Available |
| Application | Construction, Structural Frames, Industrial Projects |
High Strength Structural Performance
ASTM A500 Grade B/C Square Tubes are designed to provide excellent load-bearing capacity and structural stability. The square hollow section design offers balanced strength in multiple directions, making it suitable for both compression and bending applications.
Main advantages include:
High yield strength
Excellent structural stability
Efficient strength-to-weight ratio
Reliable performance in heavy-duty applications
Produced through advanced ERW (Electric Resistance Welding) technology, ASTM A500 Square Tubes feature accurate dimensions and consistent mechanical properties.
Benefits include:
Tight dimensional tolerances
Smooth surface finish
Easy cutting and fabrication
Reliable welding performance
These characteristics make ASTM A500 tubing a preferred choice for professional fabricators and construction companies.
| Application Scenario | Specification (Size × Thickness) |
| Construction & Steel Structure | 50 × 50 × 3.0 mm |
| 75 × 75 × 3.0 mm | |
| 100 × 100 × 4.0 mm | |
| 150 × 150 × 6.0 mm | |
| 200 × 200 × 8.0 mm | |
| Warehouse & Workshop Buildings | 100 × 100 × 4.0–6.0 mm |
| 150 × 150 × 6.0–10.0 mm | |
| 200 × 200 × 8.0–12.0 mm | |
| Infrastructure & Heavy Structures | 250 × 250 × 10.0 mm |
| 300 × 300 × 12.0 mm | |
| 400 × 400 × 16.0 mm | |
| 500 × 500 × 20.0 mm | |
| Solar Mounting & Fence Systems | 40 × 40 × 2.0 mm |
| 50 × 50 × 2.5 mm | |
| 60 × 60 × 3.0 mm | |
| General Technical Parameters | |
| Available Standard | ASTM A500 Grade B, ASTM A500 Grade C |
| Length | 5.8m, 6m, 11.8m, 12m or Customized |
| Surface Treatment | Black, Oiled, Painted, Hot-Dip Galvanized |
| Processing Service | Cutting, Drilling, Welding, Punching, Galvanizing, Custom Fabrication Available |
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| Specification | ASTM A500 Grade B | ASTM A500 Grade C |
| Application | General structural applications | Heavy-duty structural projects |
| Yield Strength | Min. 46 ksi (315 MPa) | Min. 50 ksi (345 MPa) |
| Tensile Strength | Min. 58 ksi (400 MPa) | Min. 62 ksi (425 MPa) |
| Weldability | Excellent | Excellent |
| Common Uses | Buildings, frames, supports | Heavy structures, industrial projects |
When working with outdoor or corrosive‑prone operating conditions, multiple surface protection alternatives are available for selection:
Black steel finish: Ideal for projects that will undergo further painting or additional coating on site
Hot‑dip galvanized: Delivers long‑term corrosion resistance through zinc‑layer protection
Painted finish: Custom‑mix colours and coatings to fit individual project demands
Specialised protective coating systems: Tailored for harsh and site‑specific environmental scenarios
Structural Steel Frames
ASTM A500 Square Tubes are widely used in:
Steel building frames
Commercial structures
Residential construction
Warehouse frameworks
Support columns
Their closed-section design provides excellent torsional resistance and structural efficiency.
Industrial & Manufacturing Projects
For industrial applications, ASTM A500 tubing is commonly used in:
Equipment supports
Machine frames
Safety barriers
Platforms
Industrial structures
The combination of strength and fabrication flexibility makes it suitable for customized engineering solutions.
Infrastructure & Outdoor Structures
ASTM A500 Grade B/C Square Tubes are also applied in:
Bridge components
Agricultural buildings
Solar mounting structures
Transportation facilities
Public infrastructure projects
Royal Steel Group offers a full range of value‑added processing services manufactured against customer‑supplied drawings. Our service scope covers cutting, drilling, welding, surface finishing, quality inspection, packaging and final shipment.
We can work with you to develop custom‑drilled holes, cut‑to‑length pieces, welded parts and finished HSS assemblies, all tailored to your actual project requirements.
Built for North American Construction Standards
ASTM A500 is a dominant specification for structural hollow tubing used throughout the US and Canada. Engineers often pick this grade when projects need stable structural performance and consistent material quality.
Reliable Structural Steel Tube Supply
Royal Steel Group offers:
ASTM A500 Grade B & C square hollow sections
Extensive size and wall thickness selection
Custom cutting and fabrication services
Direct factory pricing
Export-grade packing plus worldwide shipping
Suitable for Fabricators and Contractors
From steel framing and industrial machinery to general construction work, ASTM A500 square tubes deliver the flexibility and reliability that professional contractors and fabricators depend on.
ASTM A500 square tubes are carefully packed to ensure safe transit and easy handling.
Packing Methods:
Secured in bundles with steel strapping
Export-grade protective packaging
Custom packing arrangements available per client request
Delivery Options:
Container loads
Bulk vessel transport
Full global export service
Delivery plans tailored to individual project schedules
1. What is ASTM A500 Square Tube?
ASTM A500 square tubes are cold-formed welded structural hollow sections produced to ASTM A500 specifications. They see frequent use across building, metal fabrication and various industrial applications.
2. What is the difference between ASTM A500 Grade B and Grade C?
Grade C has a higher minimum mechanical strength than Grade B. It is the preferred option for heavier structural builds that demand greater load-bearing capacity.
3. Are ASTM A500 Square Tubes suitable for outdoor construction?
Yes. ASTM A500 square tubes can be deployed for outdoor structures, provided protective surface treatments like galvanizing or coating are applied to boost corrosion resistance.
4. Can ASTM A500 Square Tubes be customized?
Absolutely. Royal Steel Group offers tailored sizes, cut lengths, surface finishes and fabrication services to match your project specifications.
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Wuqing district, Tianjin city, China.
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