When it comes to combining structural strength with a sleek, modern finish, few materials compare to stainless RHS—Rectangular Hollow Sections made from stainless steel. Whether you’re working on architectural frameworks, balustrades, or high-performance industrial structures, they offers the durability, corrosion resistance, and visual appeal that today’s builders and designers demand.

In this article, we’ll explore why stainless RHS is such a popular choice, how to choose the right type for your project, and where it performs best. From construction sites to interior design, stainless steel RHS provides long-term value with minimal maintenance—all while maintaining a clean, polished look that stands the test of time.

What Is Stainless RHS?

Stainless RHS stands for Stainless Rectangular Hollow Section, a type of structural steel tube known for its rectangular cross-section and stainless steel composition. Unlike mild steel or galvanized steel, RHS with stainless surface offers superior corrosion resistance, an attractive finish, and excellent strength-to-weight ratio.

Used in both architectural and industrial settings, stainless steel RHS combines function with form. Whether it’s supporting a structure or contributing to the clean lines of a modern facade, it delivers durability and design appeal in one package.

The Key Benefits of Stainless RHS

Choosing stainless RHS brings several advantages that make it a preferred material for high-performance applications. Let’s explore the top benefits:

1. Corrosion Resistance

One of the standout features of stainless RHS is its resistance to rust, moisture, and chemical exposure. This makes it an ideal solution for projects located in:

• Coastal areas
• Industrial zones
• Medical and food-grade environments
• Outdoor structures exposed to rain and humidity

The natural chromium content in stainless steel forms a self-healing oxide layer, which protects the material without the need for coatings or paint.

2. Low Maintenance

Thanks to its corrosion resistance, stainless RHS requires minimal maintenance over its lifespan. No need for regular painting, sealing, or anti-rust treatments — which not only saves money but also reduces downtime in industrial settings or commercial operations.

3. Aesthetic Appeal

Stainless RHS features a smooth, polished surface that is often left exposed in architectural designs. Its clean lines and reflective finish suit modern, minimalist, and industrial-style buildings. From handrails to facade frames, this RHS surface is as much about appearance as it is about performance.

4. Long-Term Durability

Stainless RHS can withstand extreme temperatures, pressure, and mechanical wear, making it suitable for structural use. Unlike other materials, it doesn’t warp, bend, or degrade easily over time, even in challenging environments.

5. Sustainability

Stainless steel is 100% recyclable, and many stainless RHS products are made from partially recycled material. It’s a strong choice for projects aiming for sustainability certifications such as LEED or Green Star.

Common Applications of Stainless RHS

Stainless RHS is widely used across industries due to its versatility. Here are some of its most common applications:

1. Architectural Features

Stainless RHS is used in balustrades, pergolas, columns, door and window frames, and modern fencing. Its attractive appearance and clean geometry make it a go-to for aesthetic applications where exposed metal is a feature.

2. Construction and Infrastructure

In structural applications, stainless RHS provides strong, stable support. It’s used in:

• Framing systems
• Canopies and awnings
• Load-bearing supports
• Walkways and handrails

It performs well in both commercial and residential buildings.

3. Food and Medical Equipment

Due to its hygienic properties, RHS with stainless surface is commonly found in food processing facilities, commercial kitchens, hospitals, and laboratories. Its easy-to-clean surface and resistance to bacteria make it ideal for strict hygiene environments.

4. Marine and Coastal Projects

Projects near water require high corrosion resistance. Stainless RHS is perfect for marinas, docks, boat sheds, and seaside structures, where salt exposure quickly damages standard steel.

5. Furniture and Fit-Outs

Designers and manufacturers use stainless RHS to create modern, industrial-style furniture like tables, benches, bed frames, and shelving units. It’s sturdy, stylish, and long-lasting.

Stainless RHS vs Mild Steel RHS

When choosing between stainless RHS and mild steel RHS, it’s important to understand the differences.

In short: if your project values longevity, low maintenance, and appearance, these RHS is worth the investment.

Stainless RHS Sizes and Grades

Stainless RHS is available in a variety of sizes and grades. Common sizes include:

• 25 x 25 mm to 150 x 100 mm or larger
• Wall thicknesses from 1.5 mm to 6 mm

Grades typically include:

• 304 Stainless Steel: General-purpose, food-safe, excellent corrosion resistance
• 316 Stainless Steel: Marine-grade, higher resistance to chlorides (saltwater environments)
• 316L: Lower carbon version for better weldability

Always consult your supplier for available sizes and to confirm grade suitability based on your project.

How to Choose the Right Stainless RHS

Selecting the right stainless RHS for your project involves more than just picking a size or thickness—it’s about matching the material to your specific needs in terms of strength, environment, budget, and application. Here’s a detailed guide to help you make an informed choice:

1. Environmental Conditions
   Consider where your stainless RHS will be used. Will it be installed indoors, outdoors, or in a high-moisture environment such as near the coast or in industrial settings with chemical exposure? This RHS is ideal for corrosive environments, but choosing the right grade—such as 304 or 316—can significantly affect performance and durability. For instance, 316 stainless steel RHS offers better corrosion resistance, making it suitable for marine or harsh weather conditions. 
2. Structural Load and Strength Requirements
   Understanding the load-bearing needs of your structure is crucial. Thicker stainless RHS sections offer greater strength and resistance to bending or deformation, which is especially important for applications like framing, support columns, or large spans. If your project requires superior load handling, opt for a higher wall thickness and double-check the structural ratings of your chosen RHS size. 
3. Finish and Aesthetic Appeal
   In architectural or decorative projects, the finish of RHS with stainless surface can be just as important as its strength. Stainless RHS is available in brushed, satin, or mirror finishes, allowing you to choose a look that matches your design. For exposed structural work where appearance matters—like in retail, commercial spaces, or feature staircases—select a finish that complements your overall aesthetic. 
4. Weldability and Fabrication Needs
   Depending on your fabrication process, certain stainless steel RHS types may be easier to cut, weld, or polish. Thicker RHS sections or higher-grade stainless steel might require special welding techniques or tools. Make sure your fabrication team is equipped to handle the specific grade and gauge of the stainless steel RHS you’re sourcing. 
5. Budget and Long-Term Value
   While stainless RHS typically comes with a higher upfront cost compared to mild steel or galvanised alternatives, it pays off in longevity. The corrosion resistance, low maintenance requirements, and clean appearance of stainless steel RHS reduce replacement and repair costs over time. Be sure to calculate not just the initial purchase cost but also the life cycle cost of the material. 
6. Compliance and Certification
   Always ensure that the stainless RHS you choose meets relevant industry standards and certifications for your region or project type. This guarantees safety, structural integrity, and legal compliance—especially for commercial or public infrastructure projects.
   The popular compliance in Australia is AS/NZS 1163:2009

By carefully considering these factors, you’ll be able to select stainless steel RHS that not only fits your immediate construction or design needs but also delivers long-term performance and value.

Where to Buy Stainless RHS

When sourcing stainless RHS, it’s essential to choose a reliable supplier that offers:

• A wide range of stock sizes and grades
• Competitive pricing and quantity discounts
• Material test certificates (MTCs)
• Custom cutting services
• Fast, reliable delivery

Ask about pre-polished finishes, cutting to length, and whether they can supply both 304 and 316 grades for different applications.

Final Thoughts

Stainless RHS is a versatile, high-performing material ideal for projects that demand durability, hygiene, and visual impact. Whether you’re designing a modern staircase, a food-safe frame, or a waterfront structure, stainless steel RHS delivers strength without compromising style.

Its long-term performance, aesthetic finish, and low maintenance make it a cost-effective solution in the bigger picture — especially when quality and appearance matter.

Looking for stainless steel RHS in various sizes or finishes?
Get in touch with us today. Our team can provide fast quotes and expert advice to match your project’s needs.

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