Key Specifications for Sourcing Structural Steel Hollow Sections

Key Specifications for Sourcing Structural Steel Hollow Sections

Structural steel hollow sections – including square (SHS), rectangular (RHS), and circular (CHS) hollow sections – are essential in modern construction and engineering due to their high strength-to-weight ratio, aesthetic appeal, and versatility. When sourcing these sections, understanding key technical specifications ensures structural integrity, compliance, and project success. As a trusted supplier, Ruixiang Steel provides certified hollow sections that meet international standards and custom requirements.

1. Material Grade and Chemical Composition
The material grade defines the mechanical properties and suitability for different environments. Common standards include:

EN 10219 (European): Grades S235JR, S275JR, S355JR, S355K2

ASTM A500 (US): Grades A, B, C (with Grade B and C preferred for structural applications)

JIS G 3476 (Japanese): STKR400, STK500

Key elements like carbon content (affecting weldability) and yield strength (e.g., 235 MPa for S235JR, 355 MPa for S355JR) must align with design requirements. Higher grades like S355 offer superior load-bearing capacity for critical infrastructure.

2. Dimensional Tolerances
Precise dimensions are crucial for fabrication and assembly. Key parameters include:

Outside Dimensions (OD): Tolerances for width, height, and diameter (e.g., ±1–2 mm for SHS/RHS)

Wall Thickness: Variations typically within ±10% of the nominal thickness

Straightness and Squareness: Deviations ≤1 mm per meter length

Length: Standard lengths of 6–12 meters, with custom cutting available

3. Mechanical Properties
Hollow sections must meet specific mechanical standards:

Yield Strength: Minimum 235–355 MPa, depending on grade

Tensile Strength: 360–510 MPa

Elongation: ≥22–26% (ensuring ductility)

Impact Resistance: Especially for low-temperature applications (e.g., -20°C to -50°C)

4. Surface Treatment and Coatings
Protective coatings enhance durability in corrosive environments:

Hot-Dip Galvanizing: Zinc coating ≥600 g/m² for outdoor use

Primer/Paint: Epoxy or polyester coatings for aesthetic or industrial applications

Black (Untreated): For indoor use or post-fabrication treatment

5. Certifications and Testing
Reputable suppliers provide:

Mill Certificates: Confirming compliance with EN 10204/3.1 or ASTM A370

Non-Destructive Testing (NDT): Ultrasonic testing for weld integrity in welded hollow sections

Third-Party Inspection: Ensuring quality from production to delivery

6. Applications and Customization
Hollow sections are used in:

Building Frames and Roofs: SHS/RHS for columns and beams

Bridges and Infrastructure: CHS for trusses and supports

Architectural Features: Curved or custom-fabricated sections

Ruixiang Steel offers custom cutting, drilling, and welding to meet project-specific designs.

Why Choose Ruixiang Steel?
We supply hollow sections with:

Full traceability and compliance with EN, ASTM, and JIS standards

Custom sizes and grades for diverse projects

Technical support for material selection and fabrication

Competitive pricing and timely delivery

Conclusion
Sourcing structural steel hollow sections requires attention to material grades, dimensions, mechanical properties, and certifications. Partnering with a reliable supplier like Ruixiang Steel ensures quality, safety, and efficiency in your construction projects.