Rectangular Tube 40 80 2: Complete Analysis of Standards, Types, and Industry Performance

Types of Rectangular Tube 40x80x2

Rectangular steel tubing, particularly in the 40x80x2 mm dimension (40 mm width, 80 mm height, 2 mm wall thickness), is widely used in structural, mechanical, and architectural applications. These tubes are manufactured according to various ASTM standards that define their chemical composition, mechanical properties, and intended use cases.

Understanding the differences between these standards helps in selecting the right material for durability, strength, and environmental resistance. Below is a detailed overview of the most common ASTM specifications for rectangular tube 40x80x2.

ASTM A500

Structural Grade Tubing – Cold-Formed Welded & Seamless

Key Properties

• Minimum yield strength: 33,000 psi (228 MPa)
• Minimum tensile strength: 46,000 psi (317 MPa)
• Cold-formed carbon steel
• Available in Grades B, C, and D for increasing strength

Applications

• Building frames & trusses
• Bridges and industrial structures
• General construction

Best for: High-strength structural applications requiring durability and weldability

ASTM A53

Carbon Steel Pipe – Mechanical & Fluid Conveyance

Key Properties

• Tensile strength: 48,000–63,000 psi (331–434 MPa)
• Available in seamless or welded forms
• Can be galvanized or black finish
• Suitable for pressure applications

Applications

• Low-pressure fluid transport
• Mechanical systems
• Structural supports in non-critical environments

Best for: Dual-purpose use in both structural and fluid transport systems

ASTM A795

Fire Protection & Low-Pressure Fluid Tubing

Key Properties

• Minimum yield strength: 30,000 psi (207 MPa)
• Made from galvanized steel
• Corrosion-resistant coating
• Designed for fire sprinkler systems

Applications

• Fire suppression systems
• Low-pressure water or air lines
• Indoor plumbing frameworks

Best for: Safety-critical fire protection systems requiring corrosion resistance

ASTM A788

Ornamental Welded Tubing – Hot-Rolled Base

Key Properties

• Made from hot-rolled steel
• Weld strength equals base metal strength
• Sleek surface finish
• Primarily aesthetic focus

Applications

• Fences, railings, and gates
• Architectural accents
• Decorative frameworks

Best for: Architectural and ornamental projects where appearance matters

ASTM A847

Weathering Steel Tubing – Corrosion Resistant

Key Properties

• Minimum yield strength: 50,000 psi (345 MPa)
• High atmospheric corrosion resistance
• Forms protective rust layer (patina)
• Ideal for outdoor exposure

Applications

• Bridges and highway structures
• Outdoor sculptures and signage
• Marine and coastal environments

Best for: Long-term outdoor use without painting or coating

Standard	Yield Strength (psi)	Tensile Strength (psi)	Material Type	Primary Use
ASTM A500	33,000 min	46,000 min	Cold-formed carbon steel	Structural framing
ASTM A53	30,000 min	48,000–63,000	Seamless/welded carbon steel	Mechanical & fluid systems
ASTM A795	30,000 min	48,000 min	Galvanized steel	Fire protection systems
ASTM A788	Varies by base metal	Equal to base metal	Hot-rolled ornamental steel	Decorative structures
ASTM A847	50,000 min	60,000 min	Weathering steel	Outdoor & corrosive environments

Expert Tip: When selecting rectangular tube 40x80x2, consider not only mechanical properties but also environmental exposure. For outdoor applications, ASTM A847 offers superior corrosion resistance without additional coatings, while ASTM A795 is ideal for fire safety systems requiring galvanized protection.

Features and Applications of Rectangular Tube 40×80×2

Rectangular steel tubes with dimensions of 40 mm × 80 mm × 2 mm (width × height × wall thickness) are widely used in structural and industrial applications due to their excellent strength-to-weight ratio, versatility, and ease of fabrication. These hollow sections offer a reliable solution for frameworks, supports, and machinery components where durability and precision are essential.

Key Features of Rectangular Tube 40×80×2

Galvanized Coating

Most 40×80×2 rectangular tubes come with a galvanized finish, meaning they are coated with a protective layer of zinc through hot-dip galvanizing or electro-galvanizing processes. This coating acts as a barrier against moisture, oxygen, and corrosive elements, significantly extending the lifespan of the steel tube in outdoor or humid environments.

The galvanization process not only prevents rust and surface degradation but also enhances the tube’s resistance to mechanical damage and chemical exposure, making it ideal for agricultural, marine, and infrastructure projects.

Durability and Strength

Despite their relatively thin 2 mm wall thickness, these rectangular tubes exhibit high tensile and yield strength, allowing them to support substantial loads without deformation. The rectangular cross-section provides excellent resistance to bending and torsional forces, especially when used in horizontal or vertical load-bearing applications.

This combination of strength and lightweight design makes the 40×80×2 tube a preferred choice in construction frameworks, support beams, and industrial shelving where structural integrity is critical without adding excessive weight.

Variety of Sizes and Customization

While the 40×80×2 dimension is standardized, these tubes are available in various lengths (typically 6 to 12 meters) and can be cut to custom sizes as needed. This flexibility allows engineers and fabricators to adapt the material for specific design requirements.

The 40 mm by 80 mm profile offers an optimal balance between structural rigidity and material efficiency. It provides greater stability than smaller profiles while remaining lighter and more cost-effective than larger or thicker-walled sections.

Weldability and Fabrication

Rectangular tube 40×80×2 is highly compatible with common metalworking techniques, including MIG, TIG, and arc welding. Its uniform wall thickness ensures consistent heat distribution during welding, reducing the risk of warping or weak joints.

Additionally, the tube can be easily cut, drilled, bent, or machined into complex shapes, making it ideal for modular construction, custom frames, and automated manufacturing systems. The clean edges and consistent geometry support precision assembly in both small-scale and industrial projects.

Surface Finish and Aesthetic Appeal

Many 40×80×2 rectangular tubes feature a smooth, premium-quality surface finish—especially those with galvanized or powder-coated treatments. This makes them suitable not only for hidden structural roles but also for visible applications where appearance matters.

They are commonly used in handrails, fencing, display structures, and architectural elements where a clean, modern look is desired. The absence of rough edges or inconsistencies ensures safer handling and better integration into finished products.

Wide Range of Applications

Thanks to their mechanical properties and adaptability, rectangular tubes 40×80×2 are employed across numerous industries. Common uses include:

• Structural frameworks in buildings and sheds
• Support beams in agricultural and industrial equipment
• Chassis and frames for vehicles and trailers
• Scaffolding and temporary structures
• Mechanical components in automation and robotics
• Furniture and fitness equipment frames

Feature	Description	Benefit
Dimensions	40 mm × 80 mm × 2 mm	Balanced strength and lightweight for versatile use
Material	Carbon steel (typically S235 or S355)	High durability and weldability
Coating	Hot-dip or electro-galvanized	Superior corrosion resistance and longevity
Fabrication	Weldable, cuttable, bendable	Easy integration into custom designs
Applications	Construction, machinery, framing	Multi-industry usability and reliability

Note: Always verify the material grade and coating type before purchase, especially for outdoor or load-critical applications. Improper handling or cutting can compromise the galvanized layer, leading to localized corrosion. Re-treatment or sealing of cut ends is recommended for maximum durability.

Uses of Rectangular Tube 40×80×2: A Comprehensive Guide

Rectangular steel tube 40×80×2—measuring 40 mm in width, 80 mm in height, and 2 mm wall thickness—is a versatile structural profile widely used across multiple industries. Known for its excellent strength-to-weight ratio, dimensional stability, and ease of fabrication, this tubing offers a reliable solution for both load-bearing and aesthetic applications. Below is an in-depth exploration of its most common and impactful uses.

Construction & Infrastructure

Rectangular tubes are a cornerstone in modern construction due to their high tensile strength and resistance to bending and torsional forces. The 40×80×2 profile is particularly effective in structural framing, support columns, and roof trusses.

• Ideal for modular building systems and prefabricated structures due to standardized dimensions
• Commonly used in commercial buildings, warehouses, and pedestrian bridges
• Galvanized or powder-coated finishes enhance corrosion resistance in outdoor or humid environments
• Easily welded, bolted, or bracketed for fast and secure assembly

Key benefit: Provides structural integrity while minimizing material weight and cost.

Automotive Industry

In automotive manufacturing, the 40×80×2 rectangular tube plays a critical role in chassis and frame construction. Its mechanical properties support safety, durability, and performance.

• Used in truck frames, trailers, and off-road vehicle roll cages
• Offers superior impact resistance and energy absorption in collisions
• Lightweight design contributes to improved fuel efficiency without sacrificing strength
• Compatible with robotic welding and automated assembly lines

Engineering insight: Often cold-formed to precise tolerances for seamless integration into vehicle subframes.

Furniture Design & Interior Architecture

The clean, geometric profile of 40×80×2 tubing makes it a favorite in modern and industrial-style furniture. Designers value its combination of visual appeal and load-bearing capability.

• Widely used for table bases, bed frames, shelving units, and office partitions
• Can be powder-coated in various colors for aesthetic customization
• Enables minimalist, space-efficient designs with maximum durability
• Compatible with glass, wood, and composite materials for hybrid structures

Design tip: Polished or brushed finishes add a premium look for high-end interior applications.

Signage & Outdoor Structures

Rectangular steel tubing provides the backbone for durable, weather-resistant signage and outdoor installations.

• Supports large billboards, directional signs, and digital displays
• Resists wind loads and vibration, ensuring long-term stability
• Galvanized or stainless variants prevent rust in coastal or high-moisture areas
• Can be engineered with mounting brackets and cable management channels

Durability note: Properly treated 40×80×2 tubes can last over 20 years in outdoor environments.

Sports & Recreational Equipment

This tubing is frequently used in the production of robust, portable, and safe sports infrastructure.

• Used in football goalposts, basketball hoops, and gym equipment frames
• Popular for bicycle racks and camping trailers due to lightweight strength
• Withstands repeated impact and dynamic loads in active environments
• Easy to assemble and anchor securely to concrete or ground surfaces

Safety advantage: Rounded edges and smooth finishes reduce injury risk in public installations.

Agricultural & Farming Applications

The resilience of 40×80×2 rectangular tube makes it ideal for the demanding conditions of agricultural use.

• Used in livestock enclosures, hay storage racks, and grain bins
• Constructs durable farm trailers and utility carts for heavy loads
• Resists deformation under pressure from stacked materials
• Can be welded into custom fencing posts and gate frames

Practical benefit: Low maintenance and long service life reduce operational downtime and replacement costs.

Professional Insight: When selecting 40×80×2 rectangular tubing, consider the material grade (e.g., S235, S355), surface finish (galvanized, painted, or bare), and fabrication method (laser-cut, welded, or pre-drilled). Matching these factors to the application ensures optimal performance, longevity, and cost-efficiency.

Industry	Primary Use	Key Material Advantage	Common Finish
Construction	Structural framing, support beams	High rigidity and load capacity	Galvanized or powder-coated
Automotive	Chassis, roll cages, trailers	Impact resistance and lightweight	Bare or primed for painting
Furniture	Table bases, shelving frames	Aesthetic versatility and strength	Powder-coated (various colors)
Signage	Billboard frames, sign supports	Wind resistance and stability	Hot-dip galvanized
Sports	Goalposts, bike racks, gym frames	Durability and portability	Painted or galvanized
Agriculture	Fencing, trailers, storage racks	Corrosion and load resistance	Galvanized or epoxy-coated

Additional Considerations

• Weldability: Carbon steel 40×80×2 tubes are easily welded using standard techniques (MIG, TIG, or arc welding).
• Customization: Can be cut, drilled, or bent to meet specific design requirements.
• Sustainability: Fully recyclable and often made from recycled steel, supporting green building standards.
• Cost Efficiency: Offers a balance between performance and material cost, especially in large-scale projects.
• Standards Compliance: Ensure tubes meet regional standards (e.g., EN 10219 for cold-formed hollow sections in Europe).

How to Choose Rectangular Tube 40x80x2: A Complete Buyer’s Guide

Selecting the right rectangular steel tube—specifically the 40x80x2 mm size (40 mm width, 80 mm height, 2 mm wall thickness)—is crucial for structural integrity, cost-efficiency, and long-term performance. Whether you're building a frame, support structure, or decorative element, understanding the key selection criteria ensures optimal results. This guide breaks down the essential factors to consider when choosing a 40x80x2 rectangular tube for your project.

Important Note: The "40x80x2" designation refers to the external dimensions and wall thickness: 40 mm (width) × 80 mm (height) × 2 mm (wall thickness). Always verify these specifications with suppliers, as slight variations can affect load-bearing capacity and compatibility.

1. Define the Purpose and Application

The intended use of the rectangular tube is the foundation for all other decisions. It directly influences the required strength, durability, and finish of the material.

• Light-Duty Applications: For non-structural or low-load uses such as shelving, furniture frames, or interior fixtures, a 2 mm wall thickness is often sufficient. These applications prioritize cost and ease of fabrication.
• Medium to Heavy-Duty Applications: For structural frameworks, machine bases, agricultural equipment, or outdoor installations, evaluate whether 2 mm thickness provides adequate strength. Consider thicker walls (e.g., 2.5–3 mm) for enhanced rigidity and safety margins.
• Dynamic vs. Static Loads: Tubes subjected to vibration, impact, or cyclic stress (e.g., vehicle frames) require stronger materials and tighter tolerances than static supports.

2. Select the Appropriate Material

The choice of material significantly affects performance, longevity, and appearance. The two most common materials for rectangular tubing are carbon steel and stainless steel.

• Carbon Steel (e.g., S235JR, Q235):
  • Offers high tensile strength and excellent weldability
  • Ideal for structural applications where cost-effectiveness is key
  • Requires protective coatings (paint, galvanization) to prevent rust in humid or outdoor environments
  • Commonly used in construction, industrial frames, and machinery
• Stainless Steel (e.g., 304, 316):
  • Superior corrosion resistance, especially in coastal, chemical, or high-moisture environments
  • Provides a clean, modern aesthetic—ideal for architectural and decorative projects
  • Higher cost but minimal maintenance over time
  • Grade 316 offers enhanced resistance to chlorides, making it suitable for marine applications

3. Understand Dimensional Accuracy and Tolerances

The 40x80x2 mm dimensions are standard, but manufacturing tolerances can vary by supplier and region. Always confirm:

• Actual wall thickness (may range from 1.8–2.2 mm depending on standards)
• Corner radii, which affect fitment in joints and connections
• Length tolerances and straightness for precision assemblies
• Certified dimensional compliance with standards like EN 10219 (cold-formed) or ASTM A500 (structural tubing)

A well-balanced design considers both rigidity and weight. The 40x80 mm profile offers good resistance to bending along the longer axis (80 mm), making it ideal for vertical or horizontal load-bearing members.

4. Verify Compliance with Industry Standards

Ensure the tubing meets recognized quality and safety standards. Certification guarantees consistent mechanical properties and dimensional accuracy.

Standard	Region	Key Features	Common Applications
ASTM A500	United States	Cold-formed welded and seamless carbon steel structural tubing	Construction, industrial frameworks, load-bearing structures
EN 10219	Europe	Cold-formed welded structural hollow sections (including rectangular)	Architectural, mechanical, and engineering applications
ISO 657-19	International	Hollow sections for structural use	Global projects requiring standardized specifications
GB/T 6728	China	General structural carbon steel tubes	Domestic construction and manufacturing

Always request mill test certificates (MTCs) or material test reports (MTRs) to verify chemical composition and mechanical properties such as yield strength and elongation.

Expert Tip: When sourcing 40x80x2 rectangular tubing, compare multiple suppliers and request sample sections if possible. This allows you to assess surface finish, weld quality (for welded tubes), and overall dimensional consistency before placing a bulk order.

Additional Considerations

• Surface Finish: Choose between mill finish, galvanized, powder-coated, or polished surfaces based on environmental exposure and aesthetic requirements.
• Weldability: Carbon steel tubes are generally easier to weld than stainless steel. Use proper techniques and filler materials to avoid warping or weak joints.
• Availability: The 40x80x2 size is widely available, but stainless steel variants may have longer lead times. Confirm stock levels before finalizing designs.
• Cost vs. Performance: While carbon steel is more economical, stainless steel can offer better lifecycle value in corrosive environments due to reduced maintenance and replacement costs.

Choosing the right 40x80x2 rectangular tube involves balancing strength, material properties, dimensional accuracy, and compliance. By carefully evaluating your project’s needs and verifying product specifications, you can ensure a durable, safe, and cost-effective solution. When in doubt, consult with a structural engineer or materials specialist to confirm suitability for critical applications.

Frequently Asked Questions About Rectangular Tube 40×80×2

Q1: What is a rectangular tube 40×80×2 made from?

A rectangular tube with dimensions 40×80×2 is typically manufactured from either carbon steel or stainless steel, each offering distinct advantages depending on the intended application:

• Stainless Steel: Known for its excellent corrosion resistance and polished, attractive finish, stainless steel is ideal for environments exposed to moisture, chemicals, or where aesthetic appeal matters—such as architectural features, handrails, or indoor fixtures.
• Galvanized Carbon Steel: This material is carbon steel coated with a protective layer of zinc through a galvanization process. It provides strong rust resistance at a lower cost than stainless steel and is widely used in structural and industrial applications.

Both materials are durable and weldable, but the choice depends on budget, environmental exposure, and design requirements.

Q2: How thick is a rectangular tube 40×80×2?

The designation "40×80×2" refers to the tube's key dimensional specifications:

• Width: 40 millimeters
• Height: 80 millimeters
• Wall Thickness: 2 millimeters

This standardized sizing makes the tube compatible with common engineering and construction frameworks. It is commonly available in stock lengths of 6 meters, though custom cuts are possible depending on supplier capabilities. The consistent cross-section ensures predictable load-bearing performance in both vertical and horizontal applications.

Q3: What are the benefits of a 2 mm thickness in a rectangular tube 40×80×2?

The 2 mm wall thickness offers an optimal balance between mechanical strength and material efficiency:

• Structural Strength: Provides sufficient rigidity to support moderate loads, making it suitable for frameworks, supports, and bracing elements.
• Weight Efficiency: Keeps the overall weight of the tube relatively low, facilitating easier transportation, handling, and installation—especially important in large-scale construction or DIY projects.
• Cost-Effectiveness: Uses less raw material than thicker-walled tubes, reducing both cost and resource consumption without compromising essential performance.
• Workability: The 2 mm thickness is ideal for cutting, drilling, welding, and bending with standard metalworking tools, enhancing versatility across fabrication processes.

This makes the 40×80×2 tube a popular choice in applications where strength, economy, and ease of use are all important factors.

Q4: What are the typical applications of galvanized carbon steel rectangular tube 40×80×2?

The galvanized carbon steel version of the 40×80×2 rectangular tube is widely used in both industrial and commercial settings due to its durability and corrosion resistance:

• Structural Frameworks: Used in building supports, mezzanines, and equipment platforms where strength and longevity are required.
• Construction Scaffolding: Its load-bearing capacity and rust-resistant coating make it ideal for temporary and permanent support structures.
• Fencing and Gates: Frequently used in gate frames and fence posts due to its rigidity and weather resistance.
• Agricultural Equipment: Found in machinery frames, animal enclosures, and greenhouse structures exposed to outdoor elements.
• Storage Racking: Utilized in warehouse shelving and pallet racks where strength-to-weight ratio is crucial.

The galvanized finish significantly extends the tube’s service life in humid, outdoor, or corrosive environments, making it a cost-effective solution for long-term installations.

Q5: How does rectangular tube 40×80×2 compare to other sizes and materials?

Understanding how this tube compares helps in selecting the right profile for your project:

Feature	40×80×2 Carbon Steel (Galvanized)	40×80×2 Stainless Steel	Thicker Wall Alternatives (e.g., 3–4 mm)
Corrosion Resistance	High (due to zinc coating)	Very High (inherent in alloy)	Moderate to High (depends on coating/material)
Strength	Good for medium loads	Comparable strength	Higher (better for heavy-duty use)
Weight	Lightweight	Slightly heavier than carbon steel	Significantly heavier
Cost	Low to moderate	Higher (due to material cost)	Higher (more material used)
Best Use Cases	Outdoor structures, fencing, general construction	Architectural details, food processing, marine environments	Heavy machinery, industrial supports, seismic zones

This comparison highlights why the 40×80×2 galvanized carbon steel tube is a go-to option for many builders and fabricators: it delivers reliable performance at a competitive price point.