rectangular cross-section. It is manufactured from Q215 grade steel, a carbon structural steel as per the Chinese GB/T 700 standard. This material is widely recognized for its excellent combination of moderate strength, good plasticity, toughness, and weldability, making it a fundamental component in various structural and mechanical applications.

Key Characteristics

Material Grade: Q215

The "Q" denotes the Yield Strength point.

The "215" indicates a minimum yield strength of 215 Megapascals (MPa). This represents the stress at which the material begins to deform plastically.

Shape: Rectangular Hollow Section (RHS). Its flat surfaces make it easier to connect and join to other flat surfaces compared to round tubes, simplifying fabrication.

Manufacturing Process: Typically produced through a high-frequency electric resistance welding (ERW) process. Cold-rolled or hot-rolled steel strips are formed into a rectangular shape and then the seam is welded to create a strong, uniform section.

Surface Finish: Commonly available in two primary finishes:

Black (Unoated): The natural mill finish, often with a light oxide layer.

Galvanized (Zinc-Coated): A protective zinc coating is applied via hot-dip galvanizing to significantly enhance corrosion resistance, ideal for outdoor or harsh environments.

Advantages and Benefits

High Strength-to-Weight Ratio: Offers substantial load-bearing capacity and structural integrity while being relatively lightweight, contributing to efficient and economical designs.

Ease of Fabrication and Installation: Its flat sides allow for easy bolting, welding, and connecting to other structural members, reducing assembly time and labor costs.

Aesthetic Appeal: The clean, linear appearance of rectangular pipe is often preferred in modern architectural and design applications where structural elements are exposed.

Torsional Stability: Provides superior resistance to torsional (twisting) forces compared to open-section profiles like I-beams or channels of equivalent weight.

Common Applications

Q215 Rectangular pipe is a versatile material used across numerous industries:

Construction & Building Framing: Used for lightweight structural frameworks, support columns, roof trusses, and purlins.

Machinery and Equipment Manufacturing: Ideal for constructing frames, bases, and guards for agricultural machinery, industrial equipment, and conveyor systems.

Automotive and Vehicle Fabrication: Used in roll cages, chassis components, and trailer building.

Warehouse and Storage Solutions: A primary material for building heavy-duty storage racks, shelving systems, and mezzanine floors.

Architectural and Decorative Uses: Popular in modern furniture design, handrails, fencing, gates, and various aesthetic architectural features.

Available Sizes

It is produced in a wide range of sizes, defined by:

Outside Dimensions (Width x Height): e.g., 20mm x 10mm, 50mm x 30mm, 100mm x 50mm, etc.

Wall Thickness: Varies to suit different load requirements, commonly from 1.0mm to 4.0mm and above.

Length: Standard lengths are typically 6 meters or 12 meters, but custom lengths can be produced.