Circular Hollow Sections (CHS), Grade 350, various sizes
Cold-formed structural steel hollow sections with 350 MPa minimum yield strength, manufactured to AS/NZS 1163:2016 for superior structural performance in Australian conditions
Cold-formed structural steel hollow sections with 350 MPa minimum yield strength, manufactured to AS/NZS 1163:2016 for superior structural performance in Australian conditions
CHS Grade 350 steel sections are high-strength, cold-formed circular hollow sections offering excellent structural efficiency with a minimum yield strength of 350 MPa. Manufactured through electric resistance welding (ERW) process, these sections provide superior torsional stiffness, uniform stress distribution, and aesthetic appeal for exposed structural applications. Compliant with AS/NZS 1163:2016 Grade C350L0, they feature guaranteed impact properties at 0°C and are suitable for welding to AS/NZS 1554.1.
- High strength-to-weight ratio (350 MPa minimum yield)
- Excellent torsional stiffness and resistance
- Uniform stress distribution in all directions
- Superior aesthetic appeal for exposed applications
- Good weldability with appropriate procedures
- Available with various protective coatings
- Complies with Australian Standards AS/NZS 1163
- Suitable for all climate zones in Australia
- 100% recyclable at end of life
- Proven performance in extreme weather events
- Readily available from Australian suppliers
- Compatible with standard connection systems
- 01 High strength-to-weight ratio (350 MPa minimum yield)
- 02 Excellent torsional stiffness and resistance
- 03 Uniform stress distribution in all directions
- 04 Superior aesthetic appeal for exposed applications
- 05 Good weldability with appropriate procedures
- 01 Requires fire protection for rated assemblies
- 02 Susceptible to corrosion without protective coating
- 03 Higher initial cost than timber alternatives
- 04 Thermal bridging considerations in building envelope
- 05 Skilled labour required for welding and fabrication
- Density
- 7850 kg/m³
- Specific gravity
- 7.85
- Porosity
- 0 %
- Water absorption
- 0 %
- Hardness
- 150
- UV resistance
- High // With appropriate coating
- Chemical resistance
- Moderate // Requires protective coating in aggressive environments
- pH tolerance
- 4-10
- Surface roughness
- 6.3 µm
- Tensile strength
- 430 MPa
- Compressive strength
- 350 MPa
- Flexural strength
- 350 MPa
- Shear strength
- 200 MPa
- Poisson's ratio
- 0.3
- Impact resistance
- 27
- Creep resistance
- Excellent // Negligible at normal temperatures
- Embodied carbon
- 1.74
- Carbon footprint
- 1740
- Embodied energy
- 20.1 MJ/kg
- Water footprint
- 64 L/kg
- Recycled content
- 25 %
- Renewable content
- 0 %
- Circular score
- 9
- Combustibility class
- Non-combustible // AS 1530.1
- Fire resistance level
- 0-120 minutes // Depends on protection system
- Flame spread index
- 0
- Smoke dev. index
- 0
- Heat release rate
- 0
- Material cost (range)
- $1200-$2000 // AUD per tonne (2024-2025)
- Material cost (per unit)
- $1.50-$150 // AUD per metre depending on size
- Lead time
- 1-4 weeks // Standard sections ex-stock
- Lifecycle cost
- $50-$100 // AUD per m² over 50 years
- Annual maintenance
- $5-$20 // AUD per m² for coating maintenance
- Market availability
- Readily available // Major suppliers nationwide
- Expected lifespan
- 50-100 // Years with appropriate maintenance
- Maintenance interval
- 5-10 // Years - Coating inspection/touch-up
- Warranty period
- 10-25 // Years - Coating warranties available