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ASTM A500 Grade D HSS Square Tube for Outdoor Weather-Exposed Steel Structures
ASTM A500 Grade D HSS Square Tube
ASTM A500 Grade D square hollow structural sections are widely used for structural steel fabrication and tough construction‑site conditions. Thanks to its closed square shape, this tube achieves an optimal strength‑to‑weight performance. It works well for fabricating load‑bearing parts including building columns, beams, frames, support assemblies and trusses.
When deployed for outdoor applications or locations subject to weather exposure, we can provide matching surface protection and coating solutions tailored to individual project specifications.
| Item | Details |
| Product Name | ASTM A500 Grade D HSS Square Tube |
| Product Type | Square Hollow Structural Section |
| Standard | ASTM A500 |
| Grade | Grade D |
| Shape | Square |
| Material | Carbon Structural Steel |
| Surface | Black, Galvanized, Painted or Customized |
| Length | Standard or Customized |
| Wall Thickness | Customized according to requirements |
| Outside Dimensions | Customized |
| Processing | Cutting, Drilling, Welding and Fabrication |
| Application | Structural Steel Construction |
1. Superior Structural Capability
Square HSS sections perform well under compression, bending and torsion, which makes them a practical choice for structural frames and other load‑bearing assemblies.
2. Well‑Suited for Outdoor Builds
When used for steel structures exposed to outdoor elements, proper coating and anti‑corrosion treatments can be chosen to match site environments and real‑world service requirements.
3. Hassle‑Free Processing
Its consistent square cross‑section supports smooth cutting, welding, drilling and on‑site joining work, boosting overall fabrication productivity.
4. Custom‑Built to Project Needs
We offer varied sizes, wall thicknesses and cut‑to‑length options for square HSS tubes, following customer drawings, structural calculation results or project‑specific technical requirements.
5. Trusted for Worldwide Engineering Works
Manufactured to ASTM standards, these structural tubes are commonly adopted across global construction projects, where reliable material performance and complete supporting documentation are essential.
| 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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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
Typical applications for ASTM A500 Grade D square HSS tube include:
Steel building frameworks
Exposed‑site steel framing
Industrial facilities and workshop constructions
Structural columns and load‑bearing supports
Bridge components and civil infrastructure projects
Steel platforms and access walkways
Heavy‑duty equipment support frames
Architectural steelwork and building framing
Agricultural facilities and commercial building projects
Solar‑power and other renewable‑energy related structures
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.
Royal Steel Group focuses on the supply of structural steel tubes and hollow section profiles, with solid hands‑on experience in global export business.
Our sales footprint spans major international markets across North and South America, the Middle East, Southeast Asia, Africa and Europe.
We maintain rigorous end‑to‑end quality control procedures, deliver competitive pricing, and develop custom‑tailored fabrication solutions for different projects. Backed by reliable international logistics resources, we help overseas customers complete infrastructure and construction works with improved efficiency and reduced overall project costs.
Our quality verification scope covers:
Chemical composition analysis
Mechanical performance testing
Dimensional check
Wall thickness verification
Surface condition assessment
Weld inspection where relevant
Issuance of official Mill Test Certificates (MTC)
Third‑party audits like SGS, available upon buyer’s request
Whether you need ASTM A500 Grade D HSS Square Tube for a single construction project or bulk quantities for long-term procurement, we can provide customized specifications and project-based supply solutions.
Square HSS tubes are firmly bundled prior to shipment to minimise shifting and surface scratches throughout loading, transit and handling.
Our shipping and packaging solutions consist of:
Containerized sea freight
Bulk vessel shipment
Custom‑made export packaging
Waterproof protective wrapping
Steel‑band strapping and bundled packing
We provide full sets of shipping documents tailored to your order and destination country requirements, including commercial invoice, packing list, mill test certificate and certificate of origin.
1. What is ASTM A500 Grade D HSS Square Tube?
ASTM A500 Grade D square HSS is a hollow structural section produced in compliance with ASTM A500 standard. It is widely adopted for structural‑grade projects where dependable strength, stable dimensions and good process‑ability are essential.
2. Can you offer custom sizes and drawing‑based fabrication?
Absolutely. Royal Steel Group supports custom outer dimensions, wall thicknesses and cut‑to‑length sizes per client drawings and project specs. We also deliver full value‑added processing: cutting, drilling, welding, surface finishing, inspection, packaging and shipment. Custom holes and pre‑fabricated welded HSS assemblies are workable.
3. Is ASTM A500 Grade D fit for outdoor exposed‑environment projects?
It works for outdoor and weather‑exposed steel constructions. To achieve better anti‑corrosion performance, you may pick proper surface finishes including hot‑dip galvanizing, painted coating or other protective solutions matching site conditions.
4. What quality‑related documents can you provide?
We supply Mill Test Certificates (MTC), chemical & mechanical test reports, inspection records, packing lists and certificates of origin as per order demands. Third‑party inspection services can also be organised upon buyers’ request.
5. Are large‑volume project orders acceptable? How about export packaging & shipping?
Yes, we handle bulk and project‑oriented procurement. Our service covers material supply, custom fabrication, quality control, export paperwork and global logistics coordination.
For export, square HSS tubes are tightly strapped into bundles. Waterproof wrapping and tailor‑made packaging are available to suit your destination and shipping mode.
ROYAL STEEL GROUP
Address
Kangsheng development industry zone,
Wuqing district, Tianjin city, China.
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