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ASTM A847 HSS Square Tube Corrosion-Resistant Structural Steel Tube for Outdoor Weather-Exposed Construction
ASTM A847 square HSS tube is a high‑performance structural hollow section engineered for projects requiring solid mechanical strength, long‑term service life and atmospheric corrosion resistance. Thanks to its square hollow geometry, it serves as a cost‑effective structural option for load‑bearing frames, building columns, support members, trusses and various architectural steel components.
Suited for outdoor and weather‑exposed steel constructions, this A847 weathering steel tube forms a self‑protecting patina when exposed to qualified atmospheric environments. Under proper service conditions, it can lower reliance on traditional anti‑corrosion coating treatments.
Royal Steel Group provides ASTM A847 square HSS tubes with custom outer dimensions, wall thicknesses and cut‑to‑length options. We also offer complete value‑added fabrication services based on customers’ technical drawings.
| Item | Specification |
| Product Name | ASTM A847 HSS Square Tube |
| Standard | ASTM A847 |
| Product Type | HSS Square Tube / Square Hollow Section |
| Material | High-Strength Low-Alloy Weathering Steel |
| Shape | Square |
| Application | Structural & Architectural Steel |
| Surface | Weathering Steel / Customized Treatment |
| Outside Dimensions | Customized |
| Wall Thickness | Customized |
| Standard Length | Available according to requirements |
| Processing | Cutting, Drilling, Welding, Fabrication |
| Quality Documentation | MTC / Inspection Report |
| Customization | Available |
Enhanced Atmospheric Corrosion Resistance
ASTM A847 square HSS is developed for projects demanding better resistance against atmospheric corrosion. When exposed to appropriate outdoor conditions, the material develops a stable protective surface layer which slows down further corrosion progression.
Reliable Structural Strength
Its square hollow cross‑section enables effective load distribution, along with solid performance against compression, bending and torsion. This makes it a practical choice for general structural steel fabrication work.
Low‑Maintenance Outdoor Solution
Within compatible outdoor environments, weathering steel minimises the need for conventional paint‑based protective coatings. Real‑world service performance is subject to site conditions including drainage, humidity, salt exposure and overall project design.
Convenient On‑Site Fabrication
Square HSS sections handle cutting, drilling, welding and field assembly smoothly. It works equally well for standard structural parts as well as custom‑built steel assemblies.
Custom‑Tailored Supply Options
Royal Steel Group produces A847 square HSS following client‑provided drawings. Custom dimensions, wall thicknesses, cut‑to‑length sizes, pre‑drilled holes and finished fabricated components are all available.
| 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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Conventional carbon steel deployed in outdoor settings typically relies on regular repainting and ongoing anti-corrosion treatments to resist environmental erosion. As a superior alternative, weathering steel HSS works perfectly for well-designed exposed structures. Under qualified atmospheric conditions, it can form a dense, self-protecting patina that actively shields the steel substrate from further corrosion.
That said, weathering steel is not universally applicable for all working environments. It is not recommended for scenarios with persistent dampness, coastal salt spray exposure, enclosed humid spaces or areas prone to standing water accumulation. For these harsh conditions, supplementary anti-corrosion measures or alternative steel materials will be necessary to guarantee long-term structural stability.
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
Common application scenarios for ASTM A847 square HSS tube
This weather‑resistant square hollow section fits a broad scope of outdoor and structural‑grade projects:
Outdoor steel structures
Structural building frames
Steel columns and supports
Bridges and pedestrian bridges
Architectural steel structures
Industrial buildings
Steel platforms and walkways
Outdoor equipment frames
Transportation infrastructure
Agricultural structures
Landscape and architectural projects
Weather-exposed load-bearing structures
Royal Steel Group provides value-added processing based on customer-supplied drawings.
Cutting → Drilling → Welding → Surface Finishing → Quality Inspection → Packaging → Shipment
Available services include:
Cut-to-length HSS tubes
Custom-drilled holes
CNC cutting
Welded components
Fabricated square tube assemblies
Custom structural steel parts
Surface treatment
Dimensional inspection
Our fabrication services help customers receive ready-to-install HSS components rather than standard-length steel tubes requiring additional processing.
At Royal Steel Group, we specialise in structural steel tubes and hollow‑section profiles, bringing extensive real‑world expertise in global export trade.
Our market reach covers North and South America, the Middle East, Southeast Asia, Africa and Europe. We follow strict end‑to‑end quality control workflows, offer competitive pricing and project‑specific custom fabrication solutions.
Supported by dependable international logistics networks, we assist overseas clients in delivering infrastructure and construction projects with better efficiency and lower total project expenditure. Quality checks run through every production and processing phase to secure precise dimensions and stable product performance, covering chemical composition analysis, mechanical tests, outer dimension and wall‑thickness verification, straightness and surface condition assessment, plus weld examination for fabricated parts. We supply official Mill Test Certificates (MTC), and third‑party inspection can also be arranged on buyers’ request.
Royal Steel Group provides structural steel products and customized fabrication solutions for international construction and engineering projects.
We support customers from material selection and production to processing, quality inspection, packaging and shipment.
ASTM A847 square HSS tubes are tightly bundled to withstand rough handling during international transit. We adjust export packaging solutions based on product sizes, order volume, destination country and chosen shipping mode.
Our standard export‑ready services cover steel‑band bundled packing, waterproof wrapping, container stuffing and bulk vessel loading, alongside custom‑built export packaging upon demand. Royal Steel Group is also able to arrange full export documentation and global logistics support tailored to each buyer’s requirements.
1. What is ASTM A847 HSS Square Tube?
ASTM A847 square HSS belongs to high‑strength low‑alloy weathering steel hollow sections, developed for structural projects that demand improved atmospheric corrosion resistance.
2. Is ASTM A847 HSS Square Tube fit for outdoor deployment?
Absolutely. It is engineered for outdoor, weather‑exposed steel structures. Under proper atmospheric conditions, the material will form its own protective patina layer.
3. Is paint coating mandatory for ASTM A847 Square Tube?
Painting is not always required. Within suitable site conditions, this weathering steel can perform well without traditional paint systems. Nevertheless, you need to assess site factors including coastal salt exposure, persistent dampness, poor drainage and standing water before choosing an uncoated weathering‑steel design.
4. What are its typical application fields?
ASTM A847 square HSS is widely utilised for bridges, structural frames, columns, support members, industrial buildings, working platforms, architectural steelwork, outdoor equipment supports and various infrastructure developments.
5. Do you supply custom‑sized HSS square tubes?
Yes. Royal Steel Group delivers custom outer sizes, wall thicknesses and cut‑to‑length pieces based on customer drawings and actual project requirements.
6. Can you perform fabrication work on ASTM A847 HSS Square Tubes?
We provide full‑scope processing services such as cutting, drilling, welding and surface finishing. Pre‑drilled holes, custom cut sections and fully finished HSS assemblies are all obtainable.
7. What surface finish options are offered?
Tubes can be supplied in original weathering‑steel mill condition or processed with custom surface treatments to match project demands. Extra anti‑corrosion solutions are recommended for environments where weathering steel cannot perform adequately.
8. Is ASTM A847 HSS Square Tube weldable?
Yes, welding and fabrication are feasible. You shall follow qualified welding procedures and select matching welding consumables. Welding parameters need to be defined in line with project specifications and relevant industry standards.
9. Which quality‑related paperwork can you issue?
Upon order request, we provide Mill Test Certificates (MTC), inspection reports and other material‑related documents. Third‑party inspection services can also be organised.
10. How do you pack ASTM A847 HSS Square Tubes for export shipment?
Tubes are normally bundled and firmly strapped. Waterproof wrapping or tailor‑made export packaging can be arranged depending on shipping solutions and destination conditions.
11. Does Royal Steel Group accept large‑volume orders?
We cater to both bulk procurement and project‑oriented orders. Our one‑stop service covers custom fabrication, quality control, export document preparation, packaging and international logistics coordination.
ROYAL STEEL GROUP
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Kangsheng development industry zone,
Wuqing district, Tianjin city, China.
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